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x86/compat: remove is_compat_task()

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x86's is_compat_task always checked the current syscall type, not the
task type.  It has no non-arch users any more, so just remove it to
avoid confusion.

On x86, nothing should really be checking the task ABI.  There are
legitimate users for the syscall ABI and for the mm ABI.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Lutomirski 2016-03-22 14:25:27 -07:00 committed by Linus Torvalds
parent 7365abbade
commit f970165bee
3 changed files with 4 additions and 3 deletions
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3
arch/x86/include/asm/compat.h
View file

@ -316,9 +316,10 @@ static inline bool is_x32_task(void)
return false;
}
static inline bool is_compat_task(void)
static inline bool in_compat_syscall(void)
{
return is_ia32_task() || is_x32_task();
}
#define in_compat_syscall in_compat_syscall /* override the generic impl */
#endif /* _ASM_X86_COMPAT_H */

2
arch/x86/include/asm/ftrace.h
View file

@ -58,7 +58,7 @@ int ftrace_int3_handler(struct pt_regs *regs);
#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
{
if (is_compat_task())
if (in_compat_syscall())
return true;
return false;
}

2
arch/x86/kernel/process_64.c
View file

@ -478,7 +478,7 @@ void set_personality_ia32(bool x32)
if (current->mm)
current->mm->context.ia32_compat = TIF_X32;
current->personality &= ~READ_IMPLIES_EXEC;
/* is_compat_task() uses the presence of the x32
/* in_compat_syscall() uses the presence of the x32
syscall bit flag to determine compat status */
current_thread_info()->status &= ~TS_COMPAT;
} else {