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powerpc/jump_label: adjust inline asm to be consistent

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Added support for a new macro ARCH_STATIC_BRANCH_ASM in powerpc
to avoid duplication of inline asm between C and Rust. This is
inline with 'commit aecaf18165 ("jump_label: adjust inline asm to be consistent")'

Co-developed-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://github.com/Rust-for-Linux/linux/issues/105
Link: https://github.com/linuxppc/issues/issues/451
Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260708082454.1254320-4-mkchauras@gmail.com
This commit is contained in:
Mukesh Kumar Chaurasiya (IBM) 2026-07-08 13:54:50 +05:30 committed by Madhavan Srinivasan
parent be809b60cb
commit 13244c0a40
1 changed files with 13 additions and 10 deletions
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23
arch/powerpc/include/asm/jump_label.h
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@ -15,14 +15,20 @@
#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
#define JUMP_LABEL_NOP_SIZE 4
#define JUMP_TABLE_ENTRY(key, label) \
".pushsection __jump_table, \"aw\" \n\t" \
".long 1b - ., " label " - . \n\t" \
JUMP_ENTRY_TYPE key " - . \n\t" \
".popsection \n\t"
#define ARCH_STATIC_BRANCH_ASM(key, label) \
"1: nop \n\t" \
JUMP_TABLE_ENTRY(key, label)
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm goto("1:\n\t"
"nop # arch_static_branch\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".long 1b - ., %l[l_yes] - .\n\t"
JUMP_ENTRY_TYPE "%c0 - .\n\t"
".popsection \n\t"
asm goto(
ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
: : "i" (&((char *)key)[branch]) : : l_yes);
return false;
@ -34,10 +40,7 @@ static __always_inline bool arch_static_branch_jump(struct static_key *key, bool
{
asm goto("1:\n\t"
"b %l[l_yes] # arch_static_branch_jump\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".long 1b - ., %l[l_yes] - .\n\t"
JUMP_ENTRY_TYPE "%c0 - .\n\t"
".popsection \n\t"
JUMP_TABLE_ENTRY("%c0", "%l[l_yes]")
: : "i" (&((char *)key)[branch]) : : l_yes);
return false;