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arm64: simplify arch_static_branch/_jump function

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Extracted the jump table definition code from the arch_static_branch and
arch_static_branch_jump functions into a macro JUMP_TABLE_ENTRY to reduce
code duplication.

Signed-off-by: George Guo <guodongtai@kylinos.cn>
Link: https://lore.kernel.org/r/20240430085655.2798551-2-dongtai.guo@linux.dev
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
George Guo 2024-04-30 16:56:55 +08:00 committed by Will Deacon
parent 1279e8d0dc
commit 588de8c6d3
1 changed files with 15 additions and 13 deletions
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28
arch/arm64/include/asm/jump_label.h
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@ -15,17 +15,23 @@
#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
#define JUMP_TABLE_ENTRY(key, label) \
".pushsection __jump_table, \"aw\"\n\t" \
".align 3\n\t" \
".long 1b - ., %l["#label"] - .\n\t" \
".quad %c0 - .\n\t" \
".popsection\n\t" \
: : "i"(key) : : label
static __always_inline bool arch_static_branch(struct static_key * const key,
const bool branch)
{
char *k = &((char *)key)[branch];
asm goto(
"1: nop \n\t"
" .pushsection __jump_table, \"aw\" \n\t"
" .align 3 \n\t"
" .long 1b - ., %l[l_yes] - . \n\t"
" .quad %c0 - . \n\t"
" .popsection \n\t"
: : "i"(&((char *)key)[branch]) : : l_yes);
JUMP_TABLE_ENTRY(k, l_yes)
);
return false;
l_yes:
@ -35,15 +41,11 @@ l_yes:
static __always_inline bool arch_static_branch_jump(struct static_key * const key,
const bool branch)
{
char *k = &((char *)key)[branch];
asm goto(
"1: b %l[l_yes] \n\t"
" .pushsection __jump_table, \"aw\" \n\t"
" .align 3 \n\t"
" .long 1b - ., %l[l_yes] - . \n\t"
" .quad %c0 - . \n\t"
" .popsection \n\t"
: : "i"(&((char *)key)[branch]) : : l_yes);
JUMP_TABLE_ENTRY(k, l_yes)
);
return false;
l_yes:
return true;