[GIT PULL tip/core/urgent] Fix for hlist_entry_safe() regression

From: Paul E. McKenney
Date: Thu Mar 21 2013 - 10:23:14 EST

[Reposting with corrected subject line.]

Hello, Ingo,

This series contains a single commit that fixes a regression in
hlist_entry_safe(). This macro references its argument twice, which
can cause NULL-pointer errors. This commit applies a gcc statement
expression, creating a temporary variable to avoid the double reference.
This has been posted to LKML at https://lkml.org/lkml/2013/3/9/75.

Kudos to CAI Qian, whose testing uncovered this, to Eric Dumazet, who
spotted root cause, and to Li Zefan, who tested this commit.

This commit is available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent

Thanx, Paul

Paul E. McKenney (1):
list: Fix double fetch of pointer in hlist_entry_safe()

include/linux/list.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/