becef184df
The generic implementation of raw_cpu_generic_add_return() is:
#define raw_cpu_generic_add_return(pcp, val) \
({ \
typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
\
*__p += val; \
*__p; \
})
where the 'pcp' argument is a __percpu lvalue.
There, the variable '__p' is declared as a __percpu pointer
the type of the address of 'pcp') but:
1) the value assigned to it, the return value of raw_cpu_ptr(), is
a plain (__kernel) pointer, not a __percpu one.
2) this variable is dereferenced just after while a __percpu
pointer is implicitly __noderef.
So, fix the declaration of the 'pcp' variable to its correct type:
the plain (non-percpu) pointer corresponding to pcp's address,
using the fact that typeof() ignores the address space and the
'noderef' attribute of its agument.
Same for raw_cpu_generic_xchg(), raw_cpu_generic_cmpxchg() &
raw_cpu_generic_cmpxchg_double().
This removes 209 warnings on ARM, 525 on ARM64, 220 on x86 &
more than 2600 on ppc64 (all of them with the default config).
Cc: Tejun Heo <tj@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Reported-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
444 lines
13 KiB
C
444 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_PERCPU_H_
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#define _ASM_GENERIC_PERCPU_H_
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#include <linux/compiler.h>
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#include <linux/threads.h>
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#include <linux/percpu-defs.h>
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#ifdef CONFIG_SMP
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/*
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* per_cpu_offset() is the offset that has to be added to a
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* percpu variable to get to the instance for a certain processor.
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*
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* Most arches use the __per_cpu_offset array for those offsets but
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* some arches have their own ways of determining the offset (x86_64, s390).
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*/
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#ifndef __per_cpu_offset
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extern unsigned long __per_cpu_offset[NR_CPUS];
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#define per_cpu_offset(x) (__per_cpu_offset[x])
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#endif
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/*
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* Determine the offset for the currently active processor.
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* An arch may define __my_cpu_offset to provide a more effective
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* means of obtaining the offset to the per cpu variables of the
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* current processor.
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*/
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#ifndef __my_cpu_offset
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#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
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#endif
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#ifdef CONFIG_DEBUG_PREEMPT
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#define my_cpu_offset per_cpu_offset(smp_processor_id())
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#else
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#define my_cpu_offset __my_cpu_offset
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#endif
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/*
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* Arch may define arch_raw_cpu_ptr() to provide more efficient address
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* translations for raw_cpu_ptr().
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*/
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#ifndef arch_raw_cpu_ptr
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#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
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#endif
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#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
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extern void setup_per_cpu_areas(void);
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#endif
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#endif /* SMP */
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#ifndef PER_CPU_BASE_SECTION
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#ifdef CONFIG_SMP
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#define PER_CPU_BASE_SECTION ".data..percpu"
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#else
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#define PER_CPU_BASE_SECTION ".data"
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#endif
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#endif
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#ifndef PER_CPU_ATTRIBUTES
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#define PER_CPU_ATTRIBUTES
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#endif
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#define raw_cpu_generic_read(pcp) \
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({ \
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*raw_cpu_ptr(&(pcp)); \
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})
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#define raw_cpu_generic_to_op(pcp, val, op) \
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do { \
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*raw_cpu_ptr(&(pcp)) op val; \
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} while (0)
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#define raw_cpu_generic_add_return(pcp, val) \
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({ \
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typeof(pcp) *__p = raw_cpu_ptr(&(pcp)); \
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\
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*__p += val; \
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*__p; \
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})
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#define raw_cpu_generic_xchg(pcp, nval) \
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({ \
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typeof(pcp) *__p = raw_cpu_ptr(&(pcp)); \
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typeof(pcp) __ret; \
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__ret = *__p; \
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*__p = nval; \
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__ret; \
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})
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#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \
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({ \
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typeof(pcp) *__p = raw_cpu_ptr(&(pcp)); \
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typeof(pcp) __ret; \
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__ret = *__p; \
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if (__ret == (oval)) \
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*__p = nval; \
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__ret; \
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})
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#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ \
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typeof(pcp1) *__p1 = raw_cpu_ptr(&(pcp1)); \
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typeof(pcp2) *__p2 = raw_cpu_ptr(&(pcp2)); \
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int __ret = 0; \
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if (*__p1 == (oval1) && *__p2 == (oval2)) { \
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*__p1 = nval1; \
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*__p2 = nval2; \
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__ret = 1; \
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} \
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(__ret); \
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})
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#define __this_cpu_generic_read_nopreempt(pcp) \
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({ \
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typeof(pcp) __ret; \
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preempt_disable_notrace(); \
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__ret = READ_ONCE(*raw_cpu_ptr(&(pcp))); \
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preempt_enable_notrace(); \
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__ret; \
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})
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#define __this_cpu_generic_read_noirq(pcp) \
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({ \
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typeof(pcp) __ret; \
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unsigned long __flags; \
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raw_local_irq_save(__flags); \
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__ret = raw_cpu_generic_read(pcp); \
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raw_local_irq_restore(__flags); \
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__ret; \
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})
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#define this_cpu_generic_read(pcp) \
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({ \
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typeof(pcp) __ret; \
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if (__native_word(pcp)) \
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__ret = __this_cpu_generic_read_nopreempt(pcp); \
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else \
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__ret = __this_cpu_generic_read_noirq(pcp); \
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__ret; \
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})
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#define this_cpu_generic_to_op(pcp, val, op) \
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do { \
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unsigned long __flags; \
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raw_local_irq_save(__flags); \
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raw_cpu_generic_to_op(pcp, val, op); \
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raw_local_irq_restore(__flags); \
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} while (0)
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#define this_cpu_generic_add_return(pcp, val) \
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({ \
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typeof(pcp) __ret; \
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unsigned long __flags; \
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raw_local_irq_save(__flags); \
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__ret = raw_cpu_generic_add_return(pcp, val); \
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raw_local_irq_restore(__flags); \
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__ret; \
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})
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#define this_cpu_generic_xchg(pcp, nval) \
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({ \
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typeof(pcp) __ret; \
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unsigned long __flags; \
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raw_local_irq_save(__flags); \
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__ret = raw_cpu_generic_xchg(pcp, nval); \
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raw_local_irq_restore(__flags); \
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__ret; \
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})
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#define this_cpu_generic_cmpxchg(pcp, oval, nval) \
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({ \
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typeof(pcp) __ret; \
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unsigned long __flags; \
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raw_local_irq_save(__flags); \
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__ret = raw_cpu_generic_cmpxchg(pcp, oval, nval); \
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raw_local_irq_restore(__flags); \
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__ret; \
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})
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#define this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ \
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int __ret; \
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unsigned long __flags; \
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raw_local_irq_save(__flags); \
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__ret = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \
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oval1, oval2, nval1, nval2); \
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raw_local_irq_restore(__flags); \
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__ret; \
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})
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#ifndef raw_cpu_read_1
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#define raw_cpu_read_1(pcp) raw_cpu_generic_read(pcp)
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#endif
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#ifndef raw_cpu_read_2
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#define raw_cpu_read_2(pcp) raw_cpu_generic_read(pcp)
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#endif
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#ifndef raw_cpu_read_4
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#define raw_cpu_read_4(pcp) raw_cpu_generic_read(pcp)
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#endif
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#ifndef raw_cpu_read_8
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#define raw_cpu_read_8(pcp) raw_cpu_generic_read(pcp)
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#endif
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#ifndef raw_cpu_write_1
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#define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef raw_cpu_write_2
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#define raw_cpu_write_2(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef raw_cpu_write_4
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#define raw_cpu_write_4(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef raw_cpu_write_8
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#define raw_cpu_write_8(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef raw_cpu_add_1
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#define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef raw_cpu_add_2
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#define raw_cpu_add_2(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef raw_cpu_add_4
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#define raw_cpu_add_4(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef raw_cpu_add_8
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#define raw_cpu_add_8(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef raw_cpu_and_1
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#define raw_cpu_and_1(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef raw_cpu_and_2
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#define raw_cpu_and_2(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef raw_cpu_and_4
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#define raw_cpu_and_4(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef raw_cpu_and_8
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#define raw_cpu_and_8(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef raw_cpu_or_1
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#define raw_cpu_or_1(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef raw_cpu_or_2
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#define raw_cpu_or_2(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef raw_cpu_or_4
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#define raw_cpu_or_4(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef raw_cpu_or_8
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#define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef raw_cpu_add_return_1
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#define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef raw_cpu_add_return_2
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#define raw_cpu_add_return_2(pcp, val) raw_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef raw_cpu_add_return_4
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#define raw_cpu_add_return_4(pcp, val) raw_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef raw_cpu_add_return_8
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#define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef raw_cpu_xchg_1
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#define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef raw_cpu_xchg_2
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#define raw_cpu_xchg_2(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef raw_cpu_xchg_4
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#define raw_cpu_xchg_4(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef raw_cpu_xchg_8
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#define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef raw_cpu_cmpxchg_1
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#define raw_cpu_cmpxchg_1(pcp, oval, nval) \
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raw_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef raw_cpu_cmpxchg_2
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#define raw_cpu_cmpxchg_2(pcp, oval, nval) \
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raw_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef raw_cpu_cmpxchg_4
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#define raw_cpu_cmpxchg_4(pcp, oval, nval) \
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raw_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef raw_cpu_cmpxchg_8
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#define raw_cpu_cmpxchg_8(pcp, oval, nval) \
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raw_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef raw_cpu_cmpxchg_double_1
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#define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef raw_cpu_cmpxchg_double_2
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#define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef raw_cpu_cmpxchg_double_4
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#define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef raw_cpu_cmpxchg_double_8
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#define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef this_cpu_read_1
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#define this_cpu_read_1(pcp) this_cpu_generic_read(pcp)
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#endif
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#ifndef this_cpu_read_2
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#define this_cpu_read_2(pcp) this_cpu_generic_read(pcp)
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#endif
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#ifndef this_cpu_read_4
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#define this_cpu_read_4(pcp) this_cpu_generic_read(pcp)
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#endif
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#ifndef this_cpu_read_8
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#define this_cpu_read_8(pcp) this_cpu_generic_read(pcp)
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#endif
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#ifndef this_cpu_write_1
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#define this_cpu_write_1(pcp, val) this_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef this_cpu_write_2
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#define this_cpu_write_2(pcp, val) this_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef this_cpu_write_4
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#define this_cpu_write_4(pcp, val) this_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef this_cpu_write_8
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#define this_cpu_write_8(pcp, val) this_cpu_generic_to_op(pcp, val, =)
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#endif
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#ifndef this_cpu_add_1
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#define this_cpu_add_1(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef this_cpu_add_2
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#define this_cpu_add_2(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef this_cpu_add_4
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#define this_cpu_add_4(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef this_cpu_add_8
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#define this_cpu_add_8(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
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#endif
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#ifndef this_cpu_and_1
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#define this_cpu_and_1(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef this_cpu_and_2
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#define this_cpu_and_2(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef this_cpu_and_4
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#define this_cpu_and_4(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef this_cpu_and_8
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#define this_cpu_and_8(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
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#endif
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#ifndef this_cpu_or_1
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#define this_cpu_or_1(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef this_cpu_or_2
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#define this_cpu_or_2(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef this_cpu_or_4
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#define this_cpu_or_4(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef this_cpu_or_8
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#define this_cpu_or_8(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
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#endif
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#ifndef this_cpu_add_return_1
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#define this_cpu_add_return_1(pcp, val) this_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef this_cpu_add_return_2
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#define this_cpu_add_return_2(pcp, val) this_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef this_cpu_add_return_4
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#define this_cpu_add_return_4(pcp, val) this_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef this_cpu_add_return_8
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#define this_cpu_add_return_8(pcp, val) this_cpu_generic_add_return(pcp, val)
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#endif
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#ifndef this_cpu_xchg_1
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#define this_cpu_xchg_1(pcp, nval) this_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef this_cpu_xchg_2
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#define this_cpu_xchg_2(pcp, nval) this_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef this_cpu_xchg_4
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#define this_cpu_xchg_4(pcp, nval) this_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef this_cpu_xchg_8
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#define this_cpu_xchg_8(pcp, nval) this_cpu_generic_xchg(pcp, nval)
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#endif
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#ifndef this_cpu_cmpxchg_1
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#define this_cpu_cmpxchg_1(pcp, oval, nval) \
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this_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef this_cpu_cmpxchg_2
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#define this_cpu_cmpxchg_2(pcp, oval, nval) \
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this_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef this_cpu_cmpxchg_4
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#define this_cpu_cmpxchg_4(pcp, oval, nval) \
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this_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef this_cpu_cmpxchg_8
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#define this_cpu_cmpxchg_8(pcp, oval, nval) \
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this_cpu_generic_cmpxchg(pcp, oval, nval)
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#endif
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#ifndef this_cpu_cmpxchg_double_1
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#define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef this_cpu_cmpxchg_double_2
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#define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef this_cpu_cmpxchg_double_4
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#define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#ifndef this_cpu_cmpxchg_double_8
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#define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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#endif
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#endif /* _ASM_GENERIC_PERCPU_H_ */
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