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riscv: kprobes: Use patch_text_nosync() for insn slots

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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>
This commit is contained in:
Samuel Holland 2024-03-27 09:04:42 -07:00 • committed by Palmer Dabbelt
parent 2aa30d19cf
commit b1756750a3
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GPG key ID: 2E1319F35FBB1889
1 changed files with 2 additions and 3 deletions
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5
arch/riscv/kernel/probes/kprobes.c
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@ -29,9 +29,8 @@ 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)