Commit-ID: 669f8a900198599d3c2e2e463bafe12d30d96507
Gitweb: http://git.kernel.org/tip/669f8a900198599d3c2e2e463bafe12d30d96507
Author: Borislav Petkov <bp@xxxxxxx>
AuthorDate: Thu, 15 Jan 2015 09:17:12 +0100
Committer: Borislav Petkov <bp@xxxxxxx>
CommitDate: Mon, 23 Feb 2015 13:44:14 +0100
x86/smap: Use ALTERNATIVE macro
... and drop unfolded version. No need for ASM_NOP3 anymore either as
the alternatives do the proper padding at build time and insert proper
NOPs at boot time.
There should be no apparent operational change from this patch.
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/include/asm/smap.h | 30 +++++++++---------------------
1 file changed, 9 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/smap.h b/arch/x86/include/asm/smap.h
index c56cb4f..ba665eb 100644
--- a/arch/x86/include/asm/smap.h
+++ b/arch/x86/include/asm/smap.h
@@ -27,23 +27,11 @@
#ifdef CONFIG_X86_SMAP
-#define ASM_CLAC \
- 661: ASM_NOP3 ; \
- .pushsection .altinstr_replacement, "ax" ; \
- 662: __ASM_CLAC ; \
- .popsection ; \
- .pushsection .altinstructions, "a" ; \
- altinstruction_entry 661b, 662b, X86_FEATURE_SMAP, 3, 3, 0 ; \
- .popsection
-
-#define ASM_STAC \
- 661: ASM_NOP3 ; \
- .pushsection .altinstr_replacement, "ax" ; \
- 662: __ASM_STAC ; \
- .popsection ; \
- .pushsection .altinstructions, "a" ; \
- altinstruction_entry 661b, 662b, X86_FEATURE_SMAP, 3, 3, 0 ; \
- .popsection
+#define ASM_CLAC \
+ ALTERNATIVE "", __stringify(__ASM_CLAC), X86_FEATURE_SMAP
+
+#define ASM_STAC \
+ ALTERNATIVE "", __stringify(__ASM_STAC), X86_FEATURE_SMAP
#else /* CONFIG_X86_SMAP */
@@ -61,20 +49,20 @@
static __always_inline void clac(void)
{
/* Note: a barrier is implicit in alternative() */
- alternative(ASM_NOP3, __stringify(__ASM_CLAC), X86_FEATURE_SMAP);
+ alternative("", __stringify(__ASM_CLAC), X86_FEATURE_SMAP);
}
static __always_inline void stac(void)
{
/* Note: a barrier is implicit in alternative() */
- alternative(ASM_NOP3, __stringify(__ASM_STAC), X86_FEATURE_SMAP);
+ alternative("", __stringify(__ASM_STAC), X86_FEATURE_SMAP);
}
/* These macros can be used in asm() statements */
#define ASM_CLAC \
- ALTERNATIVE(ASM_NOP3, __stringify(__ASM_CLAC), X86_FEATURE_SMAP)
+ ALTERNATIVE("", __stringify(__ASM_CLAC), X86_FEATURE_SMAP)
#define ASM_STAC \
- ALTERNATIVE(ASM_NOP3, __stringify(__ASM_STAC), X86_FEATURE_SMAP)
+ ALTERNATIVE("", __stringify(__ASM_STAC), X86_FEATURE_SMAP)
#else /* CONFIG_X86_SMAP */
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|