[PATCH v2 1/3] kernel/events/uprobes: pass VMA instead of MM to remove_breakpoint()
From: David Hildenbrand <hidden>
Date: 2025-03-18 22:15:04
Also in:
linux-arm-kernel, linux-mm, linux-perf-users, lkml
Subsystem:
performance events subsystem, the rest, uprobes · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds, Masami Hiramatsu, Oleg Nesterov
... and remove the "MM" argument from install_breakpoint(), because it can easily be derived from the VMA. Signed-off-by: David Hildenbrand <redacted> --- kernel/events/uprobes.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 5d6f3d9d29f44..259038d099819 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c@@ -1134,10 +1134,10 @@ static bool filter_chain(struct uprobe *uprobe, struct mm_struct *mm) return ret; } -static int -install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, - struct vm_area_struct *vma, unsigned long vaddr) +static int install_breakpoint(struct uprobe *uprobe, struct vm_area_struct *vma, + unsigned long vaddr) { + struct mm_struct *mm = vma->vm_mm; bool first_uprobe; int ret;
@@ -1162,9 +1162,11 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, return ret; } -static int -remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, unsigned long vaddr) +static int remove_breakpoint(struct uprobe *uprobe, struct vm_area_struct *vma, + unsigned long vaddr) { + struct mm_struct *mm = vma->vm_mm; + set_bit(MMF_RECALC_UPROBES, &mm->flags); return set_orig_insn(&uprobe->arch, mm, vaddr); }
@@ -1296,10 +1298,10 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new) if (is_register) { /* consult only the "caller", new consumer. */ if (consumer_filter(new, mm)) - err = install_breakpoint(uprobe, mm, vma, info->vaddr); + err = install_breakpoint(uprobe, vma, info->vaddr); } else if (test_bit(MMF_HAS_UPROBES, &mm->flags)) { if (!filter_chain(uprobe, mm)) - err |= remove_breakpoint(uprobe, mm, info->vaddr); + err |= remove_breakpoint(uprobe, vma, info->vaddr); } unlock:
@@ -1472,7 +1474,7 @@ static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm) continue; vaddr = offset_to_vaddr(vma, uprobe->offset); - err |= remove_breakpoint(uprobe, mm, vaddr); + err |= remove_breakpoint(uprobe, vma, vaddr); } mmap_read_unlock(mm);
@@ -1610,7 +1612,7 @@ int uprobe_mmap(struct vm_area_struct *vma) if (!fatal_signal_pending(current) && filter_chain(uprobe, vma->vm_mm)) { unsigned long vaddr = offset_to_vaddr(vma, uprobe->offset); - install_breakpoint(uprobe, vma->vm_mm, vma, vaddr); + install_breakpoint(uprobe, vma, vaddr); } put_uprobe(uprobe); }
--
2.48.1