linux-kernel - Re: [PATCH] pmem: fix BUG() error in pmem.h:48 on X86

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Message-ID: <CAPcyv4hDLN1F-A3bsQdBdksFP6hWnpw_KkgWwLC5UcfcmcSr-Q@mail.gmail.com>
Date:	Tue, 12 Apr 2016 22:24:25 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@....com>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pmem: fix BUG() error in pmem.h:48 on X86_32

On Tue, Apr 12, 2016 at 5:10 PM, Toshi Kani <toshi.kani@....com> wrote:
> After 'commit fc0c2028135c ("x86, pmem: use memcpy_mcsafe()
> for memcpy_from_pmem()")', probing a PMEM device hits the BUG()
> error below on X86_32 kernel.
>
>  kernel BUG at include/linux/pmem.h:48!
>
> memcpy_from_pmem() calls arch_memcpy_from_pmem(), which is
> unimplemented since CONFIG_ARCH_HAS_PMEM_API is undefined on
> X86_32.
>
> Fix the BUG() error by adding default_memcpy_from_pmem().
>
> Signed-off-by: Toshi Kani <toshi.kani@....com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>

Whoops, I'll add a 32-bit boot test to my release criteria.  Thanks Toshi!