linux-kernel - Re: linux-next: build failure after merge of the rr-fixes tree

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Message-ID: <87d2smz7ob.fsf@rustcorp.com.au>
Date:	Mon, 20 May 2013 12:20:12 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vinod Koul <vinod.koul@...el.com>
Subject: Re: linux-next: build failure after merge of the rr-fixes tree

Stephen Rothwell <sfr@...b.auug.org.au> writes:
> Hi Rusty,
>
> After merging the rr-fixes tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> drivers/dma/iovlock.c: In function 'dma_pin_iovec_pages':
> drivers/dma/iovlock.c:98:21: error: dereferencing pointer to incomplete type
>    down_read(&current->mm->mmap_sem);
>                      ^
> drivers/dma/iovlock.c:101:11: error: dereferencing pointer to incomplete type
>     current->mm,
>            ^
> drivers/dma/iovlock.c:108:19: error: dereferencing pointer to incomplete type
>    up_read(&current->mm->mmap_sem);
>                    ^
>
> Caused by commit 11227d242a8c ("Hoist memcpy_fromiovec/memcpy_toiovec
> into lib/").  Clearly, net/tcp.h was indirectly including sched.h or
> asm/current.h.  Changing inclusions is fraught with problems since people
> do not follow Rule 1 (in Documentation/SubmitChecklist) consistently.  :-(

Yep, the 0day tester caught this too (it works on 32-bit unfortunately,
so I didn't see the problem).

I've not touched the #includes any more in my updated patch.

Cheers,
Rusty.
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