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kfifo: fix kfifo_alloc() to return a signed int value

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Add a new __kfifo_int_must_check_helper() helper function, which is needed
for kfifo_alloc() to return the right signed integer value.

The origin __kfifo_must_check_helper() helper was renamed into
__kfifo_uint_must_check_helper() to show the sign which is expected and
returned.

(And revert the temporary disabling of __kfifo_must_check_helper())

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefani Seibold 2010-10-27 15:34:50 -07:00 committed by Linus Torvalds
parent 12aa4c6417
commit 144ecf310e
1 changed files with 21 additions and 12 deletions
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33
include/linux/kfifo.h
View file

@ -171,8 +171,17 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void);
}
/* __kfifo_must_check_helper() is temporarily disabled because it was faulty */
#define __kfifo_must_check_helper(x) (x)
static inline unsigned int __must_check
__kfifo_uint_must_check_helper(unsigned int val)
{
return val;
}
static inline int __must_check
__kfifo_int_must_check_helper(int val)
{
return val;
}
/**
* kfifo_initialized - Check if the fifo is initialized
@ -264,7 +273,7 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void);
* @fifo: address of the fifo to be used
*/
#define kfifo_avail(fifo) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmpq = (fifo); \
const size_t __recsize = sizeof(*__tmpq->rectype); \
@ -297,7 +306,7 @@ __kfifo_must_check_helper( \
* This function returns the size of the next fifo record in number of bytes.
*/
#define kfifo_peek_len(fifo) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
const size_t __recsize = sizeof(*__tmp->rectype); \
@ -320,7 +329,7 @@ __kfifo_must_check_helper( \
* Return 0 if no error, otherwise an error code.
*/
#define kfifo_alloc(fifo, size, gfp_mask) \
__kfifo_must_check_helper( \
__kfifo_int_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
struct __kfifo *__kfifo = &__tmp->kfifo; \
@ -416,7 +425,7 @@ __kfifo_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_get(fifo, val) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
typeof((val) + 1) __val = (val); \
@ -457,7 +466,7 @@ __kfifo_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_peek(fifo, val) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
typeof((val) + 1) __val = (val); \
@ -549,7 +558,7 @@ __kfifo_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_out(fifo, buf, n) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
typeof((buf) + 1) __buf = (buf); \
@ -577,7 +586,7 @@ __kfifo_must_check_helper( \
* copied.
*/
#define kfifo_out_spinlocked(fifo, buf, n, lock) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
unsigned long __flags; \
unsigned int __ret; \
@ -606,7 +615,7 @@ __kfifo_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_from_user(fifo, from, len, copied) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
const void __user *__from = (from); \
@ -634,7 +643,7 @@ __kfifo_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_to_user(fifo, to, len, copied) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
void __user *__to = (to); \
@ -761,7 +770,7 @@ __kfifo_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_out_peek(fifo, buf, n) \
__kfifo_must_check_helper( \
__kfifo_uint_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
typeof((buf) + 1) __buf = (buf); \