Commit-ID: a77600cd03a44e54df99ea742e02f4899b82c8e1 Gitweb: http://git.kernel.org/tip/a77600cd03a44e54df99ea742e02f4899b82c8e1 Author: Borislav Petkov <bp@xxxxxxx> AuthorDate: Wed, 4 Feb 2015 09:11:17 +0100 Committer: Borislav Petkov <bp@xxxxxxx> CommitDate: Mon, 23 Feb 2015 13:54:14 +0100 x86/lib/memmove_64.S: Convert memmove() to ALTERNATIVE macro Make it execute the ERMS version if support is present and we're in the forward memmove() part and remove the unfolded alternatives section definition. Signed-off-by: Borislav Petkov <bp@xxxxxxx> --- arch/x86/lib/memmove_64.S | 19 ++----------------- 1 file changed, 2 insertions(+), 17 deletions(-) diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S index bbfa6b2..0f8a0d0 100644 --- a/arch/x86/lib/memmove_64.S +++ b/arch/x86/lib/memmove_64.S @@ -5,7 +5,6 @@ * This assembly file is re-written from memmove_64.c file. * - Copyright 2011 Fenghua Yu <fenghua.yu@xxxxxxxxx> */ -#define _STRING_C #include <linux/linkage.h> #include <asm/dwarf2.h> #include <asm/cpufeature.h> @@ -44,6 +43,8 @@ ENTRY(__memmove) jg 2f .Lmemmove_begin_forward: + ALTERNATIVE "", "movq %rdx, %rcx; rep movsb; retq", X86_FEATURE_ERMS + /* * movsq instruction have many startup latency * so we handle small size by general register. @@ -207,21 +208,5 @@ ENTRY(__memmove) 13: retq CFI_ENDPROC - - .section .altinstr_replacement,"ax" -.Lmemmove_begin_forward_efs: - /* Forward moving data. */ - movq %rdx, %rcx - rep movsb - retq -.Lmemmove_end_forward_efs: - .previous - - .section .altinstructions,"a" - altinstruction_entry .Lmemmove_begin_forward, \ - .Lmemmove_begin_forward_efs,X86_FEATURE_ERMS, \ - .Lmemmove_end_forward-.Lmemmove_begin_forward, \ - .Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs,0 - .previous ENDPROC(__memmove) ENDPROC(memmove) -- 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
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