mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-20 09:31:09 +00:00
f94909ceb1
Replace all ret/retq instructions with RET in preparation of making RET a macro. Since AS is case insensitive it's a big no-op without RET defined. find arch/x86/ -name \*.S | while read file do sed -i 's/\<ret[q]*\>/RET/' $file done Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20211204134907.905503893@infradead.org
47 lines
1,007 B
ArmAsm
47 lines
1,007 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
#include <linux/linkage.h>
|
|
#include <asm/percpu.h>
|
|
|
|
.text
|
|
|
|
/*
|
|
* Inputs:
|
|
* %rsi : memory location to compare
|
|
* %rax : low 64 bits of old value
|
|
* %rdx : high 64 bits of old value
|
|
* %rbx : low 64 bits of new value
|
|
* %rcx : high 64 bits of new value
|
|
* %al : Operation successful
|
|
*/
|
|
SYM_FUNC_START(this_cpu_cmpxchg16b_emu)
|
|
|
|
#
|
|
# Emulate 'cmpxchg16b %gs:(%rsi)' except we return the result in %al not
|
|
# via the ZF. Caller will access %al to get result.
|
|
#
|
|
# Note that this is only useful for a cpuops operation. Meaning that we
|
|
# do *not* have a fully atomic operation but just an operation that is
|
|
# *atomic* on a single cpu (as provided by the this_cpu_xx class of
|
|
# macros).
|
|
#
|
|
pushfq
|
|
cli
|
|
|
|
cmpq PER_CPU_VAR((%rsi)), %rax
|
|
jne .Lnot_same
|
|
cmpq PER_CPU_VAR(8(%rsi)), %rdx
|
|
jne .Lnot_same
|
|
|
|
movq %rbx, PER_CPU_VAR((%rsi))
|
|
movq %rcx, PER_CPU_VAR(8(%rsi))
|
|
|
|
popfq
|
|
mov $1, %al
|
|
RET
|
|
|
|
.Lnot_same:
|
|
popfq
|
|
xor %al,%al
|
|
RET
|
|
|
|
SYM_FUNC_END(this_cpu_cmpxchg16b_emu)
|