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Fri, 9 Jun 2023 12:32:58 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id iu1XAPobg2QbQgAAMHmgww (envelope-from ); Fri, 09 Jun 2023 12:32:58 +0000 Message-ID: Date: Fri, 9 Jun 2023 14:32:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.2 Subject: Re: [PATCH v6 01/17] mm/slab: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN Content-Language: en-US To: Catalin Marinas , Linus Torvalds , Christoph Hellwig , Robin Murphy Cc: Arnd Bergmann , Greg Kroah-Hartman , Will Deacon , Marc Zyngier , Andrew Morton , Herbert Xu , Ard Biesheuvel , Isaac Manjarres , Saravana Kannan , Alasdair Kergon , Daniel Vetter , Joerg Roedel , Mark Brown , Mike Snitzer , "Rafael J. Wysocki" , Jonathan Cameron , linux-mm@kvack.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org References: <20230531154836.1366225-1-catalin.marinas@arm.com> <20230531154836.1366225-2-catalin.marinas@arm.com> From: Vlastimil Babka In-Reply-To: <20230531154836.1366225-2-catalin.marinas@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 30F6440008 X-Stat-Signature: ka1x76cd364zei8uyhyi47r5m91mkifx X-HE-Tag: 1686313979-592095 X-HE-Meta: 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 7kAIm08z 7r1g4FctijMkEUBLS2QTFFIObUSa1gGPnVxfZf8M1Qu0tsbWzN2sUMKyVXgRmZ6+i+pTeQgtTYG2BtPOo5kJtTcRzLH/Eo/85Y1WzqyLo9iL32l5wsQQ2Zv+kf3K/VKnNXtdZDD9YwYgFUy0+nPIiXglIxPCdB9zp0IQ5PJcWsDjzAah0Eq5G3kSzKtq/reThn05YfHjfiqajvneojSh5bQhwy84rsdNdYET8ZL3J+P4KrBUUlLCnKEbF51gOXPAdn8pllbCw+XLD/uFIivprIlE/re/RLPW4mnnLQ5FpJy0rbazkl8sy31hCXxOKzDsdcEKvlkLH6b0553KpbwNwLKtvtMtZ/vAjA/6zVavGUniskts= 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 5/31/23 17:48, Catalin Marinas wrote: > In preparation for supporting a kmalloc() minimum alignment smaller than > the arch DMA alignment, decouple the two definitions. This requires that > either the kmalloc() caches are aligned to a (run-time) cache-line size > or the DMA API bounces unaligned kmalloc() allocations. Subsequent > patches will implement both options. > > After this patch, ARCH_DMA_MINALIGN is expected to be used in static > alignment annotations and defined by an architecture to be the maximum > alignment for all supported configurations/SoCs in a single Image. > Architectures opting in to a smaller ARCH_KMALLOC_MINALIGN will need to > define its value in the arch headers. > > Since ARCH_DMA_MINALIGN is now always defined, adjust the #ifdef in > dma_get_cache_alignment() so that there is no change for architectures > not requiring a minimum DMA alignment. > > Signed-off-by: Catalin Marinas > Cc: Andrew Morton > Cc: Christoph Hellwig > Cc: Robin Murphy > --- > include/linux/dma-mapping.h | 2 +- > include/linux/slab.h | 14 +++++++++++--- > 2 files changed, 12 insertions(+), 4 deletions(-) > > diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h > index 0ee20b764000..3288a1339271 100644 > --- a/include/linux/dma-mapping.h > +++ b/include/linux/dma-mapping.h > @@ -545,7 +545,7 @@ static inline int dma_set_min_align_mask(struct device *dev, > > static inline int dma_get_cache_alignment(void) > { > -#ifdef ARCH_DMA_MINALIGN > +#ifdef ARCH_HAS_DMA_MINALIGN > return ARCH_DMA_MINALIGN; > #endif > return 1; > diff --git a/include/linux/slab.h b/include/linux/slab.h > index 6b3e155b70bf..50dcf9cfbf62 100644 > --- a/include/linux/slab.h > +++ b/include/linux/slab.h > @@ -235,12 +235,20 @@ void kmem_dump_obj(void *object); > * alignment larger than the alignment of a 64-bit integer. > * Setting ARCH_DMA_MINALIGN in arch headers allows that. > */ > -#if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 > +#ifdef ARCH_DMA_MINALIGN > +#define ARCH_HAS_DMA_MINALIGN > +#if ARCH_DMA_MINALIGN > 8 && !defined(ARCH_KMALLOC_MINALIGN) > #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN > -#define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN > -#define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN) > +#endif > #else > +#define ARCH_DMA_MINALIGN __alignof__(unsigned long long) > +#endif It seems weird to make slab.h responsible for this part, especially for #define ARCH_HAS_DMA_MINALIGN, which dma-mapping.h consumes. Maybe it would be difficult to do differently due to some dependency hell, but minimally I don't see dma-mapping.h including slab.h so the result is include-order-dependent? Maybe it's included transitively, but then it's fragile and would be better to do explicitly? > + > +#ifndef ARCH_KMALLOC_MINALIGN > #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) > +#elif ARCH_KMALLOC_MINALIGN > 8 > +#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN > +#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) > #endif > > /* >