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Fri, 08 Nov 2019 11:40:06 -0800 (PST) Date: Fri, 8 Nov 2019 12:39:57 -0700 In-Reply-To: <20190914000743.182739-1-yuzhao@google.com> Message-Id: <20191108193958.205102-1-yuzhao@google.com> Mime-Version: 1.0 References: <20190914000743.182739-1-yuzhao@google.com> X-Mailer: git-send-email 2.24.0.rc1.363.gb1bccd3e3d-goog Subject: [PATCH v4 1/2] mm: clean up validate_slab() From: Yu Zhao To: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , "Kirill A . Shutemov" , Tetsuo Handa Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yu Zhao , "Kirill A . Shutemov" 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: The function doesn't need to return any value, and the check can be done in one pass. There is a behavior change: before the patch, we stop at the first invalid free object; after the patch, we stop at the first invalid object, free or in use. This shouldn't matter because the original behavior isn't intended anyway. Acked-by: Kirill A. Shutemov Signed-off-by: Yu Zhao --- mm/slub.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index b25c807a111f..6930c3febad7 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4404,31 +4404,26 @@ static int count_total(struct page *page) #endif #ifdef CONFIG_SLUB_DEBUG -static int validate_slab(struct kmem_cache *s, struct page *page, +static void validate_slab(struct kmem_cache *s, struct page *page, unsigned long *map) { void *p; void *addr = page_address(page); - if (!check_slab(s, page) || - !on_freelist(s, page, NULL)) - return 0; + if (!check_slab(s, page) || !on_freelist(s, page, NULL)) + return; /* Now we know that a valid freelist exists */ bitmap_zero(map, page->objects); get_map(s, page, map); for_each_object(p, s, addr, page->objects) { - if (test_bit(slab_index(p, s, addr), map)) - if (!check_object(s, page, p, SLUB_RED_INACTIVE)) - return 0; - } + u8 val = test_bit(slab_index(p, s, addr), map) ? + SLUB_RED_INACTIVE : SLUB_RED_ACTIVE; - for_each_object(p, s, addr, page->objects) - if (!test_bit(slab_index(p, s, addr), map)) - if (!check_object(s, page, p, SLUB_RED_ACTIVE)) - return 0; - return 1; + if (!check_object(s, page, p, val)) + break; + } } static void validate_slab_slab(struct kmem_cache *s, struct page *page,