mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-17 18:14:34 +08:00
4625cd6379
Rather than having two functionally identical implementations for 32- and 64-bit configurations, extend the existing assembly abstractions enough to fold the two rwlock implementations into a shared one. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/4E258DD7020000780004E3EA@nat28.tlf.novell.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
45 lines
716 B
ArmAsm
45 lines
716 B
ArmAsm
/* Slow paths of read/write spinlocks. */
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/alternative-asm.h>
|
|
#include <asm/frame.h>
|
|
#include <asm/rwlock.h>
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# define __lock_ptr eax
|
|
#else
|
|
# define __lock_ptr rdi
|
|
#endif
|
|
|
|
ENTRY(__write_lock_failed)
|
|
CFI_STARTPROC
|
|
FRAME
|
|
0: LOCK_PREFIX
|
|
addl $RW_LOCK_BIAS, (%__lock_ptr)
|
|
1: rep; nop
|
|
cmpl $RW_LOCK_BIAS, (%__lock_ptr)
|
|
jne 1b
|
|
LOCK_PREFIX
|
|
subl $RW_LOCK_BIAS, (%__lock_ptr)
|
|
jnz 0b
|
|
ENDFRAME
|
|
ret
|
|
CFI_ENDPROC
|
|
END(__write_lock_failed)
|
|
|
|
ENTRY(__read_lock_failed)
|
|
CFI_STARTPROC
|
|
FRAME
|
|
0: LOCK_PREFIX
|
|
incl (%__lock_ptr)
|
|
1: rep; nop
|
|
cmpl $1, (%__lock_ptr)
|
|
js 1b
|
|
LOCK_PREFIX
|
|
decl (%__lock_ptr)
|
|
js 0b
|
|
ENDFRAME
|
|
ret
|
|
CFI_ENDPROC
|
|
END(__read_lock_failed)
|