Commit c8976ade authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86/alternatives: Simplify smp_text_poke_single() by using tp_vec and existing APIs 



Instead of constructing a vector on-stack, just use the already
available batch-patching vector - which should always be empty
at this point.

This will allow subsequent simplifications.

Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-25-mingo@kernel.org
parent eaa24c91

arch/x86/kernel/alternative.c

+8 −3
Original line number Diff line number Diff line
@@ -2904,8 +2904,13 @@ void __ref smp_text_poke_batch_add(void *addr, const void *opcode, size_t len, c 
 */

void __ref smp_text_poke_single(void *addr, const void *opcode, size_t len, const void *emulate)

{

	struct smp_text_poke_loc tp;

	struct smp_text_poke_loc *tp;



	/* Batch-patching should not be mixed with single-patching: */

	WARN_ON_ONCE(tp_vec_nr != 0);



	tp = &tp_vec[tp_vec_nr++];

	text_poke_int3_loc_init(tp, addr, opcode, len, emulate);



	text_poke_int3_loc_init(&tp, addr, opcode, len, emulate);

	smp_text_poke_batch_process(&tp, 1);

	smp_text_poke_batch_finish();

}