diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2025-07-20 13:21:17 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-08-21 20:09:20 +0200 |
| commit | 18a111256a0b4fedfe47101f084441a84d7e357a (patch) | |
| tree | 879d77eeccd34927482bc6d0cf2e3c9321c26795 /kernel/events | |
| parent | ec46350fe1e2338f42ee84974c36b25afe8ba53a (diff) | |
uprobes: Add do_ref_ctr argument to uprobe_write function
Making update_ref_ctr call in uprobe_write conditional based
on do_ref_ctr argument. This way we can use uprobe_write for
instruction update without doing ref_ctr_offset update.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20250720112133.244369-8-jolsa@kernel.org
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/uprobes.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 955e5ed3e383..da2b3d0deab6 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -491,12 +491,12 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area_struct *vma, bool is_register) { return uprobe_write(auprobe, vma, opcode_vaddr, &opcode, UPROBE_SWBP_INSN_SIZE, - verify_opcode, is_register); + verify_opcode, is_register, true /* do_update_ref_ctr */); } int uprobe_write(struct arch_uprobe *auprobe, struct vm_area_struct *vma, const unsigned long insn_vaddr, uprobe_opcode_t *insn, int nbytes, - uprobe_write_verify_t verify, bool is_register) + uprobe_write_verify_t verify, bool is_register, bool do_update_ref_ctr) { const unsigned long vaddr = insn_vaddr & PAGE_MASK; struct mm_struct *mm = vma->vm_mm; @@ -537,7 +537,7 @@ retry: } /* We are going to replace instruction, update ref_ctr. */ - if (!ref_ctr_updated && uprobe->ref_ctr_offset) { + if (do_update_ref_ctr && !ref_ctr_updated && uprobe->ref_ctr_offset) { ret = update_ref_ctr(uprobe, mm, is_register ? 1 : -1); if (ret) { folio_put(folio); @@ -589,7 +589,7 @@ retry: out: /* Revert back reference counter if instruction update failed. */ - if (ret < 0 && ref_ctr_updated) + if (do_update_ref_ctr && ret < 0 && ref_ctr_updated) update_ref_ctr(uprobe, mm, is_register ? -1 : 1); /* try collapse pmd for compound page */ |