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| author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:17:08 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:17:08 +0200 |
| commit | 185f3d38900f750a4566f87cde6a178f3595a115 (patch) | |
| tree | d463f6da1af452b1bbdf476828ea88427087f255 /arch/x86/lib/rwlock_64.S | |
| parent | x86_64: move kernel/cpufreq (diff) | |
| download | linux-185f3d38900f750a4566f87cde6a178f3595a115.tar.xz linux-185f3d38900f750a4566f87cde6a178f3595a115.zip | |
x86_64: move lib
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib/rwlock_64.S')
| -rw-r--r-- | arch/x86/lib/rwlock_64.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/x86/lib/rwlock_64.S b/arch/x86/lib/rwlock_64.S new file mode 100644 index 000000000000..0cde1f807314 --- /dev/null +++ b/arch/x86/lib/rwlock_64.S @@ -0,0 +1,38 @@ +/* Slow paths of read/write spinlocks. */ + +#include <linux/linkage.h> +#include <asm/rwlock.h> +#include <asm/alternative-asm.i> +#include <asm/dwarf2.h> + +/* rdi: pointer to rwlock_t */ +ENTRY(__write_lock_failed) + CFI_STARTPROC + LOCK_PREFIX + addl $RW_LOCK_BIAS,(%rdi) +1: rep + nop + cmpl $RW_LOCK_BIAS,(%rdi) + jne 1b + LOCK_PREFIX + subl $RW_LOCK_BIAS,(%rdi) + jnz __write_lock_failed + ret + CFI_ENDPROC +END(__write_lock_failed) + +/* rdi: pointer to rwlock_t */ +ENTRY(__read_lock_failed) + CFI_STARTPROC + LOCK_PREFIX + incl (%rdi) +1: rep + nop + cmpl $1,(%rdi) + js 1b + LOCK_PREFIX + decl (%rdi) + js __read_lock_failed + ret + CFI_ENDPROC +END(__read_lock_failed) |