linux-kernel - Re: [PATCH 0/3] Move the ARCH_DMA_MINALIGN definition to asm/cache.h

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Date:   Tue, 13 Jun 2023 20:49:18 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Michal Simek <monstr@...str.eu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Move the ARCH_DMA_MINALIGN definition to asm/cache.h

On Tue, Jun 13, 2023 at 04:42:40PM +0000, Christophe Leroy wrote:
> 
> 
> Le 13/06/2023 à 17:52, Catalin Marinas a écrit :
> > Hi,
> > 
> > The ARCH_KMALLOC_MINALIGN reduction series defines a generic
> > ARCH_DMA_MINALIGN in linux/cache.h:
> > 
> > https://lore.kernel.org/r/20230612153201.554742-2-catalin.marinas@arm.com/
> > 
> > Unfortunately, this causes a duplicate definition warning for
> > microblaze, powerpc (32-bit only) and sh as these architectures define
> > ARCH_DMA_MINALIGN in a different file than asm/cache.h. Move the macro
> > to asm/cache.h to avoid this issue and also bring them in line with the
> > other architectures.
> 
> What about mips ?
> 
> arch/mips/include/asm/mach-generic/kmalloc.h:#define ARCH_DMA_MINALIGN	128
> arch/mips/include/asm/mach-ip32/kmalloc.h:#define ARCH_DMA_MINALIGN	32
> arch/mips/include/asm/mach-ip32/kmalloc.h:#define ARCH_DMA_MINALIGN	128
> arch/mips/include/asm/mach-n64/kmalloc.h:#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
> arch/mips/include/asm/mach-tx49xx/kmalloc.h:#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES

Sorry, I should have mentioned it in the cover letter (discussed here -
https://lore.kernel.org/r/ZIhPaixb%2F0ve7zZo@arm.com/). These kmalloc.h
files are included in asm/cache.h, based on which machine is enabled, so
there's no problem for mips. It makes more sense to keep them in those
mach-*/kmalloc.h files instead of having lots of #ifdefs in cache.h.

-- 
Catalin