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Commit d315777b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'BUG_ON' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 

* 'BUG_ON' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  Remove MAYBE_BUILD_BUG_ON
  BUILD_BUG_ON: make it handle more cases
parents 5a05a6d7 1765e3a4

include/linux/gfp.h

+1 −1
Original line number Diff line number Diff line
@@ -249,7 +249,7 @@ static inline enum zone_type gfp_zone(gfp_t flags) 
					 ((1 << ZONES_SHIFT) - 1);



	if (__builtin_constant_p(bit))

		MAYBE_BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1);

		BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1);

	else {

#ifdef CONFIG_DEBUG_VM

		BUG_ON((GFP_ZONE_BAD >> bit) & 1);

include/linux/kernel.h

+26 −6
Original line number Diff line number Diff line
@@ -575,12 +575,6 @@ struct sysinfo { 
	char _f[20-2*sizeof(long)-sizeof(int)];	/* Padding: libc5 uses this.. */

};



/* Force a compilation error if condition is true */

#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))



/* Force a compilation error if condition is constant and true */

#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))



/* Force a compilation error if a constant expression is not a power of 2 */

#define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\

	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
@@ -592,6 +586,32 @@ struct sysinfo { 
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))

#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))



/**

 * BUILD_BUG_ON - break compile if a condition is true.

 * @cond: the condition which the compiler should know is false.

 *

 * If you have some code which relies on certain constants being equal, or

 * other compile-time-evaluated condition, you should use BUILD_BUG_ON to

 * detect if someone changes it.

 *

 * The implementation uses gcc's reluctance to create a negative array, but

 * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments

 * to inline functions).  So as a fallback we use the optimizer; if it can't

 * prove the condition is false, it will cause a link error on the undefined

 * "__build_bug_on_failed".  This error message can be harder to track down

 * though, hence the two different methods.

 */

#ifndef __OPTIMIZE__

#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

#else

extern int __build_bug_on_failed;

#define BUILD_BUG_ON(condition)					\

	do {							\

		((void)sizeof(char[1 - 2*!!(condition)]));	\

		if (condition) __build_bug_on_failed = 1;	\

	} while(0)

#endif



/* Trap pasters of __FUNCTION__ at compile-time */

#define __FUNCTION__ (__func__)

include/linux/kmemcheck.h

+1 −1
Original line number Diff line number Diff line
@@ -76,7 +76,7 @@ bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size); 
									\

		_n = (long) &((ptr)->name##_end)			\

			- (long) &((ptr)->name##_begin);		\

		MAYBE_BUILD_BUG_ON(_n < 0);				\

		BUILD_BUG_ON(_n < 0);					\

									\

		kmemcheck_mark_initialized(&((ptr)->name##_begin), _n);	\

	} while (0)

include/linux/virtio_config.h

+4 −1
Original line number Diff line number Diff line
@@ -109,7 +109,10 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev, 
				      unsigned int fbit)

{

	/* Did you forget to fix assumptions on max features? */

	MAYBE_BUILD_BUG_ON(fbit >= 32);

	if (__builtin_constant_p(fbit))

		BUILD_BUG_ON(fbit >= 32);

	else

		BUG_ON(fbit >= 32);



	if (fbit < VIRTIO_TRANSPORT_F_START)

		virtio_check_driver_offered_feature(vdev, fbit);