From: Jan-Simon Möller <dl9pf@gmx.de>
Date: Thu, 29 Aug 2013 19:13:05 +0000 (+0200)
Subject: x86, asm: Fix a compilation issue with clang
X-Git-Tag: v3.12-rc1~164^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bdfc017eead9bc17cd23317ff42eb7297cb9468a;p=pandora-kernel.git

x86, asm: Fix a compilation issue with clang

Clang does not support the "shortcut" we're taking here for gcc (see below).
The patch uses the macro _ASM_DX to do the job.

From arch/x86/include/asm/uaccess.h:
/*
 * Careful: we have to cast the result to the type of the pointer
 * for sign reasons.
 *
 * The use of %edx as the register specifier is a bit of a
 * simplification, as gcc only cares about it as the starting point
 * and not size: for a 64-bit value it will use %ecx:%edx on 32 bits
 * (%ecx being the next register in gcc's x86 register sequence), and
 * %rdx on 64 bits.
 */

[ hpa: I consider this a compatibility bug in clang as this reflects a
  bit of a misunderstanding about how register strings are used by
  gcc, but the workaround is straightforward and there is no
  particular reason to not do it. ]

Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
Link: http://lkml.kernel.org/r/1377803585-5913-3-git-send-email-dl9pf@gmx.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

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