From: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
Nick Desaulniers <ndesaulniers@google.com>
Cc: "sfr@canb.auug.org.au" <sfr@canb.auug.org.au>,
"clang-built-linux@googlegroups.com"
<clang-built-linux@googlegroups.com>,
Linuxarm <linuxarm@huawei.com>,
"ardb@kernel.org" <ardb@kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"will@kernel.org" <will@kernel.org>, "guro@fb.com" <guro@fb.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: RE: arm64: mm: move dma_contiguous_reserve() to be after paging_init()
Date: Thu, 17 Sep 2020 01:35:54 +0000 [thread overview]
Message-ID: <36697ee55a7348d382c410d776fefc74@hisilicon.com> (raw)
In-Reply-To: <ccfcf5a5-79d1-6339-b4b8-33b587507807@oracle.com>
> -----Original Message-----
> From: Mike Kravetz [mailto:mike.kravetz@oracle.com]
> Sent: Thursday, September 17, 2020 12:27 PM
> To: Nick Desaulniers <ndesaulniers@google.com>; Song Bao Hua (Barry Song)
> <song.bao.hua@hisilicon.com>
> Cc: akpm@linux-foundation.org; guro@fb.com;
> linux-arm-kernel@lists.infradead.org; linux-mm@kvack.org; Linuxarm
> <linuxarm@huawei.com>; sfr@canb.auug.org.au; will@kernel.org;
> ardb@kernel.org; clang-built-linux@googlegroups.com
> Subject: Re: arm64: mm: move dma_contiguous_reserve() to be after
> paging_init()
>
> On 9/16/20 5:19 PM, Nick Desaulniers wrote:
> > It looks like that change referenced may also break arm32 boots with
> > today's next?
> >
> > The following allows me to boot, but I have no idea if it's incorrect or not.
>
> Thanks Nick,
>
> The referenced commit was pulled from Andrew's tree and subsequent
> versions of next.
>
> I'm looking into other architectures as this is dependent on where in arch
> specific boot process first cma call is made. Hopefully, there is a some way to
> do this without potentially touching a bunch of arch code.
The default cma is probably not the only who has been broken. I think the patch to enable the
dynamic number of cma areas has also broken fdt-based CMA. For example,
early_init_fdt_scan_reserved_mem() is called before paging_init() in arm64.
Considering many arch are calling early_init_fdt_scan_reserved_mem(), it seems using
memblock_alloc() for cma_area will require lots of test on different platforms.
1. arc
2.arm
3.arm64
4.csky
5.h8300
6.mips
7.nsd32
8.nios32
9.openrise
10.powerpc
11.riscv
12.sh
13.xtensa
> --
> Mike Kravetz
Thanks
Barry
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next prev parent reply other threads:[~2020-09-17 1:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 8:59 [PATCH] arm64: mm: move dma_contiguous_reserve() to be after paging_init() Barry Song
2020-09-16 15:12 ` Anders Roxell
2020-09-17 0:19 ` Nick Desaulniers
2020-09-17 0:27 ` Mike Kravetz
2020-09-17 1:35 ` Song Bao Hua (Barry Song) [this message]
2020-09-17 9:02 ` Will Deacon
2020-09-17 9:13 ` Stephen Rothwell
2020-09-17 9:36 ` Will Deacon
2020-09-17 0:57 ` Song Bao Hua (Barry Song)
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