Commit 7918baa5 authored by Török Edwin's avatar Török Edwin Committed by Ingo Molnar
Browse files

mutex: __used is needed for function referenced only from inline asm 



Impact: fix build failure on llvm-gcc-4.2

According to the gcc manual, the 'used' attribute should be applied to
functions referenced only from inline assembly.
This fixes a build failure with llvm-gcc-4.2, which deleted
__mutex_lock_slowpath, __mutex_unlock_slowpath.

Signed-off-by: default avatarTörök Edwin <edwintorok@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e25cf3db

kernel/mutex.c

+4 −4
Original line number Diff line number Diff line
@@ -59,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init); 
 * We also put the fastpath first in the kernel image, to make sure the

 * branch is predicted by the CPU as default-untaken.

 */

static void noinline __sched

static __used noinline void __sched

__mutex_lock_slowpath(atomic_t *lock_count);



/***
@@ -96,7 +96,7 @@ void inline __sched mutex_lock(struct mutex *lock) 
EXPORT_SYMBOL(mutex_lock);

#endif



static noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);

static __used noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);



/***

 * mutex_unlock - release the mutex
@@ -268,7 +268,7 @@ __mutex_unlock_common_slowpath(atomic_t *lock_count, int nested) 
/*

 * Release the lock, slowpath:

 */

static noinline void

static __used noinline void

__mutex_unlock_slowpath(atomic_t *lock_count)

{

	__mutex_unlock_common_slowpath(lock_count, 1);
@@ -313,7 +313,7 @@ int __sched mutex_lock_killable(struct mutex *lock) 
}

EXPORT_SYMBOL(mutex_lock_killable);



static noinline void __sched

static __used noinline void __sched

__mutex_lock_slowpath(atomic_t *lock_count)

{

	struct mutex *lock = container_of(lock_count, struct mutex, count);

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