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From: Peter Zijlstra <peterz@infradead.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 7/9] locking/rwlocks: introduce write_lock_nested
Date: Tue, 16 Nov 2021 11:27:38 +0100	[thread overview]
Message-ID: <YZOHmkdTM+oimFe8@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20211115185909.3949505-8-minchan@kernel.org>

On Mon, Nov 15, 2021 at 10:59:07AM -0800, Minchan Kim wrote:
> In preparation for converting bit_spin_lock to rwlock in zsmalloc
> so that multiple writers of zspages can run at the same time but
> those zspages are supposed to be different zspage instance. Thus,
> it's not deadlock. This patch adds write_lock_nested to support
> the case for LOCKDEP.
> 
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: Minchan Kim <minchan@kernel.org>
> ---
>  include/linux/rwlock.h          |  6 ++++++
>  include/linux/rwlock_api_smp.h  |  9 +++++++++
>  include/linux/rwlock_rt.h       |  6 ++++++
>  include/linux/spinlock_api_up.h |  1 +
>  kernel/locking/spinlock.c       |  6 ++++++
>  kernel/locking/spinlock_rt.c    | 12 ++++++++++++
>  6 files changed, 40 insertions(+)

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

  reply	other threads:[~2021-11-16 10:28 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-15 18:59 [PATCH v2 0/9] zsmalloc: remove bit_spin_lock Minchan Kim
2021-11-15 18:59 ` [PATCH v2 1/9] zsmalloc: introduce some helper functions Minchan Kim
2021-11-15 18:59 ` [PATCH v2 2/9] zsmalloc: rename zs_stat_type to class_stat_type Minchan Kim
2021-11-15 18:59 ` [PATCH v2 3/9] zsmalloc: decouple class actions from zspage works Minchan Kim
2021-11-15 18:59 ` [PATCH v2 4/9] zsmalloc: introduce obj_allocated Minchan Kim
2021-11-15 18:59 ` [PATCH v2 5/9] zsmalloc: move huge compressed obj from page to zspage Minchan Kim
2021-11-15 18:59 ` [PATCH v2 6/9] zsmalloc: remove zspage isolation for migration Minchan Kim
2021-11-15 18:59 ` [PATCH v2 7/9] locking/rwlocks: introduce write_lock_nested Minchan Kim
2021-11-16 10:27   ` Peter Zijlstra [this message]
2021-11-19 10:35   ` Sebastian Andrzej Siewior
2021-11-19 18:21     ` Minchan Kim
2021-11-20 15:38       ` Sebastian Andrzej Siewior
2021-11-20  3:50   ` kernel test robot
2021-11-20  3:50     ` kernel test robot
2021-11-15 18:59 ` [PATCH v2 8/9] zsmalloc: replace per zpage lock with pool->migrate_lock Minchan Kim
2021-11-15 18:59 ` [PATCH v2 9/9] zsmalloc: replace get_cpu_var with local_lock Minchan Kim

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