From: Michal Simek <michal.simek@xilinx.com>
Date: Thu, 28 Mar 2013 15:42:44 +0000 (+0100)
Subject: microblaze: Fix uaccess_ok macro
X-Git-Tag: v3.10-rc1~19^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f663b60f5215b44d147ee0c07d17ffd7e9f3f881;p=pandora-kernel.git

microblaze: Fix uaccess_ok macro

Fix access_ok macro no to permit
case where user will try to access
the last address space which is equal
to segment address.

Example:
segment addr = 0xbfff ffff
address = 0xbfff fff0
size = 0x10

Current wrong implementation
0xbfff ffff >= (0xbfff fff0 | 0x10 | (0xbfff fff0 + 0x10))
0xbfff ffff >= (0xbfff fff0        | 0xc000 0000)
0xbfff ffff >= 0xf000 0000
return 0 which is access failed even the combination is valid.
because get_fs().seq returns the last valid address.

This patch fix this problem.

Size equals to zero is valid access.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
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