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riscv: kprobes: Use patch_text_nosync() for insn slots 

[ Upstream commit b1756750a397f36ddc857989d31887c3f5081fb0 ]

These instructions are not yet visible to the rest of the system,
so there is no need to do the whole stop_machine() dance.

Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/r/20240327160520.791322-4-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Samuel Holland 2024-03-27 09:04:42 -07:00 committed by Greg Kroah-Hartman
parent d670934d4f
commit 1741021fc1
1 changed files with 2 additions and 3 deletions
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5
arch/riscv/kernel/probes/kprobes.c
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@ -28,9 +28,8 @@ static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
p->ainsn.api.restore = (unsigned long)p->addr + offset;
patch_text(p->ainsn.api.insn, &p->opcode, 1);
patch_text((void *)((unsigned long)(p->ainsn.api.insn) + offset),
&insn, 1);
patch_text_nosync(p->ainsn.api.insn, &p->opcode, 1);
patch_text_nosync(p->ainsn.api.insn + offset, &insn, 1);
}
static void __kprobes arch_prepare_simulate(struct kprobe *p)