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Wed, 01 Jul 2020 11:52:39 -0700 (PDT) Date: Wed, 1 Jul 2020 11:52:38 -0700 (PDT) From: David Rientjes X-X-Sender: rientjes@chino.kir.corp.google.com To: Long Li cc: willy@infradead.org, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] mm, slab: Check GFP_SLAB_BUG_MASK before alloc_pages in kmalloc_order In-Reply-To: <20200701151645.GA26223@lilong> Message-ID: References: <20200701151645.GA26223@lilong> User-Agent: Alpine 2.23 (DEB 453 2020-06-18) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: 6C4AB180F8B82 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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: On Wed, 1 Jul 2020, Long Li wrote: > diff --git a/mm/slab.c b/mm/slab.c > index ac7a223d9ac3..2850fe3c5fb8 100644 > --- a/mm/slab.c > +++ b/mm/slab.c > @@ -2573,13 +2573,9 @@ static struct page *cache_grow_begin(struct kmem_cache *cachep, > * Be lazy and only check for valid flags here, keeping it out of the > * critical path in kmem_cache_alloc(). > */ > - if (unlikely(flags & GFP_SLAB_BUG_MASK)) { > - gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK; > - flags &= ~GFP_SLAB_BUG_MASK; > - pr_warn("Unexpected gfp: %#x (%pGg). Fixing up to gfp: %#x (%pGg). Fix your code!\n", > - invalid_mask, &invalid_mask, flags, &flags); > - dump_stack(); > - } > + if (unlikely(flags & GFP_SLAB_BUG_MASK)) > + flags = kmalloc_invalid_flags(flags); > + > WARN_ON_ONCE(cachep->ctor && (flags & __GFP_ZERO)); > local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK); > Is this name correct? kmalloc_invalid_flags() masks off the invalid flags and returns the valid flags :) Maybe kmalloc_check_flags()?