From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D174EC4338F for ; Thu, 5 Aug 2021 23:38:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B6F4661157 for ; Thu, 5 Aug 2021 23:38:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238926AbhHEXiW (ORCPT ); Thu, 5 Aug 2021 19:38:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:36004 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237396AbhHEXiW (ORCPT ); Thu, 5 Aug 2021 19:38:22 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BCF6060E53; Thu, 5 Aug 2021 23:38:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1628206687; bh=umF3i5H5N3lEhj1YZTY3F00OIZVCBxuaZ91sZJgWmxU=; h=Date:From:To:Subject:From; b=lEfMBcmntQzxTlc87hI+01FAF9toZAErFKYuFrmQ/NyY7JBUkbAfJmhtP8l44VR3J B6bvs4zkBdBS/yCYsHa3cYtuJo4H53OSxpks9N6Wc6jOn7/4YZqNcmhJtjw1XpTci3 a7COW+abf2OnejPyZ1ye/vtM7hPhW3kez/EBGSZE= Date: Thu, 05 Aug 2021 16:38:06 -0700 From: akpm@linux-foundation.org To: mm-commits@vger.kernel.org, vbabka@suse.cz, tglx@linutronix.de, rientjes@google.com, penberg@kernel.org, mgorman@techsingularity.net, jannh@google.com, iamjoonsoo.kim@lge.com, efault@gmx.de, cl@linux.com, brouer@redhat.com, bigeasy@linutronix.de Subject: + mm-slub-make-object_map_lock-a-raw_spinlock_t.patch added to -mm tree Message-ID: <20210805233806.O_7ss%akpm@linux-foundation.org> User-Agent: s-nail v14.9.10 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm: slub: make object_map_lock a raw_spinlock_t has been added to the -mm tree. Its filename is mm-slub-make-object_map_lock-a-raw_spinlock_t.patch This patch should soon appear at https://ozlabs.org/~akpm/mmots/broken-out/mm-slub-make-object_map_lock-a-raw_spinlock_t.patch and later at https://ozlabs.org/~akpm/mmotm/broken-out/mm-slub-make-object_map_lock-a-raw_spinlock_t.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Sebastian Andrzej Siewior Subject: mm: slub: make object_map_lock a raw_spinlock_t The variable object_map is protected by object_map_lock. The lock is always acquired in debug code and within already atomic context Make object_map_lock a raw_spinlock_t. Link: https://lkml.kernel.org/r/20210805152000.12817-31-vbabka@suse.cz Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Vlastimil Babka Cc: Christoph Lameter Cc: David Rientjes Cc: Jann Horn Cc: Jesper Dangaard Brouer Cc: Joonsoo Kim Cc: Mel Gorman Cc: Mike Galbraith Cc: Pekka Enberg Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- mm/slub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/mm/slub.c~mm-slub-make-object_map_lock-a-raw_spinlock_t +++ a/mm/slub.c @@ -438,7 +438,7 @@ static inline bool cmpxchg_double_slab(s #ifdef CONFIG_SLUB_DEBUG static unsigned long object_map[BITS_TO_LONGS(MAX_OBJS_PER_PAGE)]; -static DEFINE_SPINLOCK(object_map_lock); +static DEFINE_RAW_SPINLOCK(object_map_lock); static void __fill_map(unsigned long *obj_map, struct kmem_cache *s, struct page *page) @@ -483,7 +483,7 @@ static unsigned long *get_map(struct kme { VM_BUG_ON(!irqs_disabled()); - spin_lock(&object_map_lock); + raw_spin_lock(&object_map_lock); __fill_map(object_map, s, page); @@ -493,7 +493,7 @@ static unsigned long *get_map(struct kme static void put_map(unsigned long *map) __releases(&object_map_lock) { VM_BUG_ON(map != object_map); - spin_unlock(&object_map_lock); + raw_spin_unlock(&object_map_lock); } static inline unsigned int size_from_object(struct kmem_cache *s) _ Patches currently in -mm which might be from bigeasy@linutronix.de are mm-slub-move-flush_cpu_slab-invocations-__free_slab-invocations-out-of-irq-context.patch mm-slub-make-object_map_lock-a-raw_spinlock_t.patch