linux-kernel - linux-next: build failure after merge of the akpm-current tree

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Message-ID: <20150806172403.6eac2407@canb.auug.org.au>
Date:	Thu, 6 Aug 2015 17:24:03 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Hogan <james.hogan@...tec.com>,
	Kees Cook <keescook@...omium.org>
Subject: linux-next: build failure after merge of the akpm-current tree

Hi Andrew,

After merging the akpm-current tree, today's linux-next build (powerpc
allyesconfig) failed like this:

lib/test_user_copy.c: In function 'test_user_copy_init':
lib/test_user_copy.c:111:2: error: implicit declaration of function 'csum_partial_copy_from_user' [-Werror=implicit-function-declaration]
  csum_partial_copy_from_user(usermem, kmem, PAGE_SIZE, 0, &err);
  ^

Caused by commit

  0b6e2917b6fc ("lib/test_user_copy.c: check user checksum functions")

It looks like PowerPC 64 bit has an implementation of
csum_and_copy_from_user() that does not use csum_partial_copy_from_user()
and so this latter does not exist.  You need to check for
_HAVE_ARCH_COPY_AND_CSUM_FROM_USER.

I have reverted that commit for today.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
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