linux-kernel - Re: [GIT PULL] Btrfs

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Date:	Fri, 15 Nov 2013 14:42:08 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Chris Mason <chris.mason@...ionio.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Dulshani Gunawardhana <dulshani.gunawardhana89@...il.com>,
	Gleb Natapov <gleb@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [GIT PULL] Btrfs

On Fri, Nov 15, 2013 at 2:40 PM, Chris Mason <chris.mason@...ionio.com> wrote:
> Quoting Chris Mason (2013-11-15 07:21:31)
>> Quoting Heiko Carstens (2013-11-15 06:32:16)
>> > On Thu, Nov 14, 2013 at 12:19:52PM -0500, Chris Mason wrote:
>> > > Hi Linus,
>> > >
>> > > Please pull my for-linus branch:
>> > >
>> > > git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git for-linus
>> > >
>> > > This is our usual merge window set of bug fixes, performance
>> > > improvements and cleanups.  Miao Xie has some really nice optimizations
>> > > for writeback.
>> > >
>> > > Josef also expanded our sanity checks quite a bit; these make up a big
>> > > chunk of the new lines.
>> >
>> > Hmm..  b19e68439375  "btrfs: Remove redundant local zero structure" seems to
>> > use the empty_zero_page incorrectly and causes this compile warning on s390:
>> >
>> >   CC      fs/btrfs/ioctl.o
>> > fs/btrfs/ioctl.c: In function 'btrfs_is_empty_uuid':
>> > fs/btrfs/ioctl.c:372:2: warning: passing argument 2 of 'memcmp' makes pointer from
>> >                         integer without a cast [enabled by default]
>> >   return !memcmp(uuid, empty_zero_page, BTRFS_UUID_SIZE);
>> >   ^
>> >
>> > In fact there seem to be two more incorrect usages in the kernel. The patch
>> > below is not really tested.
>>
>> Thanks Heiko,
>>
>> I'll make a new pull with the btrfs part of this.
>
> Or something slightly different ;)
>
> BUG: unable to handle kernel paging request at 0000000001ba6000
> IP: [<ffffffff812b3656>] memcmp+0xf/0x22

I was just going to comment that

+       const void *zero_page = (const void *) page_to_phys(ZERO_PAGE(0));

won't fly. You can't just cast a physical address to "void *".

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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