From bdfc017eead9bc17cd23317ff42eb7297cb9468a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jan-Simon=20M=C3=B6ller?= Date: Thu, 29 Aug 2013 21:13:05 +0200 Subject: [PATCH] x86, asm: Fix a compilation issue with clang MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: http://lkml.kernel.org/r/1377803585-5913-3-git-send-email-dl9pf@gmx.de Signed-off-by: H. Peter Anvin --- Reading git-format-patch failed