From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 29 Jun 2011 20:31:16 +0000 (-0400)
Subject: urcu-bp: don't copy old region upon mremap
X-Git-Tag: v0.6.4~7
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=4a52c06932706e3878e6dff6b8c5418641b872e5;p=userspace-rcu.git

urcu-bp: don't copy old region upon mremap

mremap keeps the same virtual pages for the old/new mappings. So
explicitly copying from the old mapping is not needed, and probably
buggy, since the old mapping might have been unmapped.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu-bp.c b/urcu-bp.c
index 543a9f3..2973574 100644
--- a/urcu-bp.c
+++ b/urcu-bp.c
@@ -254,7 +254,6 @@ static void resize_arena(struct registry_arena *arena, size_t len)
 	if (new_arena == arena->p)
 		return;
 
-	memcpy(new_arena, arena->p, arena->len);
 	bzero(new_arena + arena->len, len - arena->len);
 	arena->p = new_arena;
 }