From 78f7411668aa0b2006d331f6a288416dd91b8e5d Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Wed, 8 Aug 2012 17:35:08 +0200 Subject: [PATCH] uprobes: Do not use -EEXIST in install_breakpoint() paths -EEXIST from install_breakpoint() no longer makes sense, all callers should simply treat it as "success". Change the code to return zero and simplify register_for_each_vma(). Signed-off-by: Oleg Nesterov Acked-by: Srikar Dronamraju --- kernel/events/uprobes.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 298fbbdf57e6..3e2996b809be 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -332,7 +332,7 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned */ result = is_swbp_at_addr(mm, vaddr); if (result == 1) - return -EEXIST; + return 0; if (result) return result; @@ -657,7 +657,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, * Hence behave as if probe already existed. */ if (!uprobe->consumers) - return -EEXIST; + return 0; if (!(uprobe->flags & UPROBE_COPY_INSN)) { ret = copy_insn(uprobe, vma->vm_file); @@ -817,17 +817,11 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register) vaddr_to_offset(vma, info->vaddr) != uprobe->offset) goto unlock; - if (is_register) { + if (is_register) err = install_breakpoint(uprobe, mm, vma, info->vaddr); - /* - * We can race against uprobe_mmap(), see the - * comment near uprobe_hash(). - */ - if (err == -EEXIST) - err = 0; - } else { + else remove_breakpoint(uprobe, mm, info->vaddr); - } + unlock: up_write(&mm->mmap_sem); free: -- 2.20.1