From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f172.google.com (mail-pd0-f172.google.com [209.85.192.172]) by kanga.kvack.org (Postfix) with ESMTP id C13B56B0073 for ; Thu, 27 Nov 2014 11:01:37 -0500 (EST) Received: by mail-pd0-f172.google.com with SMTP id y13so5095019pdi.31 for ; Thu, 27 Nov 2014 08:01:37 -0800 (PST) Received: from mailout3.w1.samsung.com (mailout3.w1.samsung.com. [210.118.77.13]) by mx.google.com with ESMTPS id fa10si12212025pab.89.2014.11.27.08.01.31 for (version=TLSv1 cipher=RC4-MD5 bits=128/128); Thu, 27 Nov 2014 08:01:32 -0800 (PST) Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NFP0002SGN8PI70@mailout3.w1.samsung.com> for linux-mm@kvack.org; Thu, 27 Nov 2014 16:04:20 +0000 (GMT) From: Andrey Ryabinin Subject: [PATCH v8 05/12] mm: slub: introduce virt_to_obj function. Date: Thu, 27 Nov 2014 19:00:49 +0300 Message-id: <1417104057-20335-6-git-send-email-a.ryabinin@samsung.com> In-reply-to: <1417104057-20335-1-git-send-email-a.ryabinin@samsung.com> References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1417104057-20335-1-git-send-email-a.ryabinin@samsung.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Andrey Ryabinin , Dmitry Vyukov , Konstantin Serebryany , Dmitry Chernenkov , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Sasha Levin , Christoph Lameter , Joonsoo Kim , Dave Hansen , Andi Kleen , "H. Peter Anvin" , x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Pekka Enberg , David Rientjes virt_to_obj takes kmem_cache address, address of slab page, address x pointing somewhere inside slab object, and returns address of the begging of object. Signed-off-by: Andrey Ryabinin Acked-by: Christoph Lameter --- include/linux/slub_def.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index d82abd4..c75bc1d 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -110,4 +110,9 @@ static inline void sysfs_slab_remove(struct kmem_cache *s) } #endif +static inline void *virt_to_obj(struct kmem_cache *s, void *slab_page, void *x) +{ + return x - ((x - slab_page) % s->size); +} + #endif /* _LINUX_SLUB_DEF_H */ -- 2.1.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org