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From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
	mingo@kernel.org, jiangshanlai@gmail.com,
	akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
	josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
	rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
	fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
	mhocko@kernel.org, mgorman@techsingularity.net,
	torvalds@linux-foundation.org
Subject: [PATCH tip/core/rcu 0/15]
Date: Mon, 28 Sep 2020 16:30:41 -0700	[thread overview]
Message-ID: <20200928233041.GA23230@paulmck-ThinkPad-P72> (raw)

Hello!

This is a repost of Thomas Gleixner's "Make preempt count unconditional"
series [1], but with the addition of a kvfree_rcu() bug-fix patch making
use of this PREEMPT_COUNT addition.  This series is intended for the
upcoming v5.10 merge window.

This addition fixes the -rt bug reported by Sebastian Andrzej Siewior
[2].  Please note that with the advent of the new lockdep Kconfig
option CONFIG_PROVE_RAW_LOCK_NESTING, this is now also a mainline bug.
In happy contrast to the surprisingly large number of earlier versions
of this fix, this version uses only pre-existing kernel interfaces,
and furthermore uses them in conventional ways.

1-13.	Thomas's series [1].

14.	Use the newly accurate preemptible() macro to cause kvfree_rcu()
	to do its allocations only when it is safe to do so, even in
	CONFIG_PREEMPT_NONE=y kernels, courtesy of Uladzislau Rezki.
	Again, this fixes the bug reported by Sebastian [2].

15.	Checkpatch fix removing NULL check guarding kfree(), courtesy
	of kernel test robot and Julia Lawall.

In addition, this series reduces the size of the kernel by 100 lines
of code, about two thirds of which is from Thomas's original series and
the remaining one third from the bug fix.

Changes from v1 [1]:

o	Fix trivial !SMP build failure.
o	Apply checkpatch spelling suggestions.

							Thanx, Paul

[1]	https://lore.kernel.org/linux-mm/20200914204209.256266093@linutronix.de/
[2]	https://lore.kernel.org/lkml/20200630164543.4mdcf6zb4zfclhln@linutronix.de/

------------------------------------------------------------------------

 arch/arm/include/asm/assembler.h                                 |   11 -
 arch/arm/kernel/iwmmxt.S                                         |    2 
 arch/arm/mach-ep93xx/crunch-bits.S                               |    2 
 arch/xtensa/kernel/entry.S                                       |    2 
 drivers/gpu/drm/i915/Kconfig.debug                               |    1 
 drivers/gpu/drm/i915/i915_utils.h                                |    3 
 include/linux/bit_spinlock.h                                     |    4 
 include/linux/lockdep.h                                          |    6 
 include/linux/pagemap.h                                          |    4 
 include/linux/preempt.h                                          |   37 -----
 include/linux/uaccess.h                                          |    6 
 kernel/Kconfig.preempt                                           |    6 
 kernel/rcu/tree.c                                                |   73 ++--------
 kernel/sched/core.c                                              |    6 
 lib/Kconfig.debug                                                |    5 
 tools/testing/selftests/rcutorture/configs/rcu/SRCU-t            |    1 
 tools/testing/selftests/rcutorture/configs/rcu/SRCU-u            |    1 
 tools/testing/selftests/rcutorture/configs/rcu/TINY01            |    1 
 tools/testing/selftests/rcutorture/doc/TINY_RCU.txt              |    5 
 tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt      |    1 
 tools/testing/selftests/rcutorture/formal/srcu-cbmc/src/config.h |    1 
 21 files changed, 39 insertions(+), 139 deletions(-)

             reply	other threads:[~2020-09-28 23:30 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-28 23:30 Paul E. McKenney [this message]
2020-09-28 23:30 ` [PATCH tip/core/rcu 01/15] lib/debug: Remove pointless ARCH_NO_PREEMPT dependencies paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 02/15] preempt: Make preempt count unconditional paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 03/15] preempt: Cleanup PREEMPT_COUNT leftovers paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 04/15] lockdep: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 05/15] mm/pagemap: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 06/15] locking/bitspinlock: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 07/15] uaccess: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 08/15] sched: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 09/15] ARM: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 10/15] xtensa: " paulmck
2020-09-28 23:30 ` [PATCH tip/core/rcu 11/15] drm/i915: " paulmck
2020-10-01  7:17   ` Joonas Lahtinen
2020-10-01  8:25     ` Thomas Gleixner
2020-10-01 16:03       ` Paul E. McKenney
2020-09-28 23:30 ` [PATCH tip/core/rcu 12/15] rcutorture: " paulmck
2020-09-28 23:31 ` [PATCH tip/core/rcu 13/15] preempt: Remove PREEMPT_COUNT from Kconfig paulmck
2020-09-28 23:31 ` [PATCH tip/core/rcu 14/15] rcu/tree: Allocate a page when caller is preemptible paulmck
2020-09-29 12:07   ` Michal Hocko
2020-09-30  1:53     ` Paul E. McKenney
2020-09-30  8:41       ` Michal Hocko
2020-09-30 12:31         ` Uladzislau Rezki
2020-09-30 23:21         ` Paul E. McKenney
2020-10-01  9:02           ` Michal Hocko
2020-10-01 16:27             ` Paul E. McKenney
2020-10-02  6:57               ` Michal Hocko
2020-10-02 14:12                 ` Paul E. McKenney
2020-10-01 16:28             ` Paul E. McKenney
2020-10-01 20:03             ` Uladzislau Rezki
2020-09-28 23:31 ` [PATCH tip/core/rcu 15/15] kvfree_rcu(): Fix ifnullfree.cocci warnings paulmck

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