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authorJan-Simon Möller <dl9pf@gmx.de>2013-08-29 21:13:05 +0200
committerH. Peter Anvin <hpa@linux.intel.com>2013-08-29 13:26:33 -0700
commitbdfc017eead9bc17cd23317ff42eb7297cb9468a (patch)
treecc181a78a57c02741961db5a412eaa35002d2c91 /arch/x86
parent3e9b2327b59801e677a7581fe4d2541ca749dcab (diff)
downloadlinux-bdfc017eead9bc17cd23317ff42eb7297cb9468a.tar.bz2
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/uaccess.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 5ee26875baea..f715fee40821 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -162,7 +162,7 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
#define get_user(x, ptr) \
({ \
int __ret_gu; \
- register __inttype(*(ptr)) __val_gu asm("%edx"); \
+ register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX); \
__chk_user_ptr(ptr); \
might_fault(); \
asm volatile("call __get_user_%P3" \