From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 11 Dec 2012 08:31:49 +0000 (-0500)
Subject: ext4: zero out inline data using memset() instead of empty_zero_page
X-Git-Tag: v3.8-rc1~89^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd9926e80330d43f15b710c2935fa41b792d56fd;p=pandora-kernel.git

ext4: zero out inline data using memset() instead of empty_zero_page

Not all architectures (in particular, sparc64) have empty_zero_page.
So instead of copying from empty_zero_page, use memset to clear the
inline data by signalling to ext4_xattr_set_entry() via a magic
pointer value, EXT4_ZERO_ATTR_VALUE, which is defined by casting -1 to
a pointer.

This fixes a build failure on sparc64, and the memset() should be more
efficient than using memcpy() anyway.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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