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* Re: [GIT PULL rcu/urgent] Fix two more 4.3 regressions
@ 2015-09-27  6:28 Sedat Dilek
  2015-09-27  7:32 ` Paul E. McKenney
  0 siblings, 1 reply; 17+ messages in thread
From: Sedat Dilek @ 2015-09-27  6:28 UTC (permalink / raw)
  To: Paul McKenney; +Cc: Ingo Molnar, Linus Torvalds, LKML

Hi,

as I have observed here some lockdep issues (one could be solved in
netdev) I wanted to try this patchset.

Unfortunately, you cannot pull from...

"These changes are available in the git repository at:

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

for you to fetch changes up to 19a5ecde086a6a5287978b12ae948fa691b197b7:

  rcu: Suppress lockdep false positive for rcp->exp_funnel_mutex
(2015-09-20 21:01:22 -0700)

----------------------------------------------------------------
Oleg Nesterov (1):
      rcu: Change _wait_rcu_gp() to work around GCC bug 67055

Paul E. McKenney (1):
      rcu: Suppress lockdep false positive for rcp->exp_funnel_mutex

 include/linux/rcupdate.h | 11 +++++------
 kernel/rcu/tree.c        |  5 +++++
 2 files changed, 10 insertions(+), 6 deletions(-)"

So, I have stolen them from linux-next.git.

Please look at this, Thanks.

Regards,
- Sedat -

[1] http://marc.info/?l=linux-kernel&m=144332758307978&w=2
[2] http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/patch/?id=66e8c57da6bf6b847a48a5a6fda59512f733ed78
[3] http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/patch/?id=19a5ecde086a6a5287978b12ae948fa691b197b7

^ permalink raw reply	[flat|nested] 17+ messages in thread
* [GIT PULL rcu/urgent] Fix two more 4.3 regressions
@ 2015-09-27  4:19 Paul E. McKenney
  2015-09-28  6:05 ` Ingo Molnar
  0 siblings, 1 reply; 17+ messages in thread
From: Paul E. McKenney @ 2015-09-27  4:19 UTC (permalink / raw)
  To: mingo; +Cc: linux-kernel, msalter, linux, oleg, sasha.levin

Hello, Ingo,

This series contains two small fixes for regressions introduced during
the past merge window:

1.	Recent versions of gcc are fatally confused by use of a const
	int variable for array bounds in inline functions, one of which
	was introduced by 114b7fd4b (rcu: Create rcu_sync infrastructure).
	For more information on the gcc bug, see:

		https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055#c13

	This workaround for that gcc bug, courtesy of Oleg Nesterov,
	simply substitutes the constant expression for the two uses of
	the const int variable.

2.	Commit 2cd6ffafec06 (rcu: Extend expedited funnel locking
	to rcu_data structure) extended contention-reducing
	funnel locking from the rcu_node structures to the rcu_data
	structures, but failed to create a separate lock class for the
	rcu_sched_data structures, which is needed due to the fact that
	synchronize_rcu_expedited() invokes synchronize_sched_expedited().
	In the absence of this separate lock class, lockdep can give
	false-positive splats.	This commit therefore creates the
	required lock class so that lockdep can see that there is in
	fact no deadlock.

Both fixes have been exposed to -next and 0day Test Robot testing.

These changes are available in the git repository at:

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

for you to fetch changes up to 19a5ecde086a6a5287978b12ae948fa691b197b7:

  rcu: Suppress lockdep false positive for rcp->exp_funnel_mutex (2015-09-20 21:01:22 -0700)

----------------------------------------------------------------
Oleg Nesterov (1):
      rcu: Change _wait_rcu_gp() to work around GCC bug 67055

Paul E. McKenney (1):
      rcu: Suppress lockdep false positive for rcp->exp_funnel_mutex

 include/linux/rcupdate.h | 11 +++++------
 kernel/rcu/tree.c        |  5 +++++
 2 files changed, 10 insertions(+), 6 deletions(-)


^ permalink raw reply	[flat|nested] 17+ messages in thread
end of thread, other threads:[~2015-09-28  6:24 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-09-27  6:28 [GIT PULL rcu/urgent] Fix two more 4.3 regressions Sedat Dilek
2015-09-27  7:32 ` Paul E. McKenney
2015-09-27  7:37   ` Sedat Dilek
2015-09-27 15:49     ` Paul E. McKenney
2015-09-27 15:55       ` Sedat Dilek
2015-09-27 15:58         ` Sedat Dilek
2015-09-27 16:02           ` Sedat Dilek
2015-09-27 16:16             ` Sedat Dilek
2015-09-27 16:25               ` Sedat Dilek
2015-09-27 16:43                 ` Paul E. McKenney
2015-09-27 16:42         ` Paul E. McKenney
2015-09-27 17:24           ` Sedat Dilek
2015-09-27 17:41             ` Paul E. McKenney
2015-09-28  6:03     ` Ingo Molnar
2015-09-28  6:24       ` Sedat Dilek
  -- strict thread matches above, loose matches on Subject: below --
2015-09-27  4:19 Paul E. McKenney
2015-09-28  6:05 ` Ingo Molnar

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