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kfifo: disable __kfifo_must_check_helper()

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This helper is wrong: it coerces signed values into unsigned ones, so code
such as

	if (kfifo_alloc(...) < 0) {
		error
	}

will fail to detect the error.

So let's disable __kfifo_must_check_helper() for 2.6.36.

Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2010-10-26 14:21:19 -07:00 committed by Linus Torvalds
parent 1b627d5771
commit 52c5171214
1 changed files with 2 additions and 5 deletions
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7
include/linux/kfifo.h
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@ -171,11 +171,8 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void);
}
static inline unsigned int __must_check
__kfifo_must_check_helper(unsigned int val)
{
return val;
}
/* __kfifo_must_check_helper() is temporarily disabled because it was faulty */
#define __kfifo_must_check_helper(x) (x)
/**
* kfifo_initialized - Check if the fifo is initialized