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Wed, 09 Jun 2021 11:39:34 +0000 From: Vlastimil Babka To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: Sebastian Andrzej Siewior , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Peter Zijlstra , Jann Horn , Vlastimil Babka Subject: [RFC v2 15/34] mm, slub: restore irqs around calling new_slab() Date: Wed, 9 Jun 2021 13:38:44 +0200 Message-Id: <20210609113903.1421-16-vbabka@suse.cz> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609113903.1421-1-vbabka@suse.cz> References: <20210609113903.1421-1-vbabka@suse.cz> MIME-Version: 1.0 Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=abQ+3zq7; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=bqh+vEXL; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=abQ+3zq7; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=bqh+vEXL; dmarc=none; spf=pass (imf03.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Rspamd-Server: rspam02 X-Stat-Signature: mgndtiiua68is1tp9wj4g9ukk9y17eh7 X-Rspamd-Queue-Id: 4313EC00CBEE X-HE-Tag: 1623238771-649578 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: allocate_slab() currently re-enables irqs before calling to the page allo= cator. It depends on gfpflags_allow_blocking() to determine if it's safe to do s= o. Now we can instead simply restore irq before calling it through new_slab(= ). The other caller early_kmem_cache_node_alloc() is unaffected by this. Signed-off-by: Vlastimil Babka --- mm/slub.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index acb5e8f1d9da..f4ce372e3dd3 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1749,9 +1749,6 @@ static struct page *allocate_slab(struct kmem_cache= *s, gfp_t flags, int node) =20 flags &=3D gfp_allowed_mask; =20 - if (gfpflags_allow_blocking(flags)) - local_irq_enable(); - flags |=3D s->allocflags; =20 /* @@ -1810,8 +1807,6 @@ static struct page *allocate_slab(struct kmem_cache= *s, gfp_t flags, int node) page->frozen =3D 1; =20 out: - if (gfpflags_allow_blocking(flags)) - local_irq_disable(); if (!page) return NULL; =20 @@ -2739,16 +2734,17 @@ static void *___slab_alloc(struct kmem_cache *s, = gfp_t gfpflags, int node, goto check_new_page; } =20 + local_irq_restore(flags); put_cpu_ptr(s->cpu_slab); page =3D new_slab(s, gfpflags, node); c =3D get_cpu_ptr(s->cpu_slab); =20 if (unlikely(!page)) { - local_irq_restore(flags); slab_out_of_memory(s, gfpflags, node); return NULL; } =20 + local_irq_save(flags); if (c->page) flush_slab(s, c); =20 --=20 2.31.1