From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 8 Aug 2012 15:35:08 +0000 (+0200)
Subject: uprobes: Do not use -EEXIST in install_breakpoint() paths
X-Git-Tag: firefly_0821_release~3680^2~1401^2~60
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=78f7411668aa0b2006d331f6a288416dd91b8e5d;p=firefly-linux-kernel-4.4.55.git

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 <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---

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: