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jump_label, x86: Factor out the __jump_table generation 

Both arch_static_branch() and arch_static_branch_jump() have the same
blurb to generate the __jump_table entry, share it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210506194157.663132781@infradead.org
This commit is contained in:
Peter Zijlstra 2021-05-06 21:33:56 +02:00 committed by Ingo Molnar
parent 8bfafcdccb
commit e1aa35c4c4
1 changed files with 12 additions and 12 deletions
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24
arch/x86/include/asm/jump_label.h
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@ -14,15 +14,19 @@
#include <linux/stringify.h>
#include <linux/types.h>
#define JUMP_TABLE_ENTRY \
".pushsection __jump_table, \"aw\" \n\t" \
_ASM_ALIGN "\n\t" \
".long 1b - . \n\t" \
".long %l[l_yes] - . \n\t" \
_ASM_PTR "%c0 + %c1 - .\n\t" \
".popsection \n\t"
static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
{
asm_volatile_goto("1:"
".byte " __stringify(BYTES_NOP5) "\n\t"
".pushsection __jump_table, \"aw\" \n\t"
_ASM_ALIGN "\n\t"
".long 1b - ., %l[l_yes] - . \n\t"
_ASM_PTR "%c0 + %c1 - .\n\t"
".popsection \n\t"
JUMP_TABLE_ENTRY
: : "i" (key), "i" (branch) : : l_yes);
return false;
@ -33,13 +37,9 @@ l_yes:
static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
{
asm_volatile_goto("1:"
".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t"
"2:\n\t"
".pushsection __jump_table, \"aw\" \n\t"
_ASM_ALIGN "\n\t"
".long 1b - ., %l[l_yes] - . \n\t"
_ASM_PTR "%c0 + %c1 - .\n\t"
".popsection \n\t"
".byte 0xe9 \n\t"
".long %l[l_yes] - (. + 4) \n\t"
JUMP_TABLE_ENTRY
: : "i" (key), "i" (branch) : : l_yes);
return false;