Commit-ID: 661c80192d21269c7fc566f1d547510b0c867677 Gitweb: http://git.kernel.org/tip/661c80192d21269c7fc566f1d547510b0c867677 Author: H. Peter Anvin <h...@linux.intel.com> AuthorDate: Wed, 20 Nov 2013 12:50:51 -0800 Committer: H. Peter Anvin <h...@linux.intel.com> CommitDate: Wed, 20 Nov 2013 13:57:07 -0800
x86-64, copy_user: Use leal to produce 32-bit results When we are using lea to produce a 32-bit result, we can use the leal form, rather than using leaq and worry about truncation elsewhere. Make the leal explicit, both to be more obvious and since that is what gcc generates and thus is less likely to trigger obscure gas bugs. Cc: Fenghua Yu <fenghua...@intel.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Link: http://lkml.kernel.org/r/1384634221-6006-1-git-send-email-fenghua...@intel.com Signed-off-by: H. Peter Anvin <h...@linux.intel.com> --- arch/x86/lib/copy_user_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S index ffe4eb9..dee945d 100644 --- a/arch/x86/lib/copy_user_64.S +++ b/arch/x86/lib/copy_user_64.S @@ -186,7 +186,7 @@ ENTRY(copy_user_generic_unrolled) 30: shll $6,%ecx addl %ecx,%edx jmp 60f -40: lea (%rdx,%rcx,8),%rdx +40: leal (%rdx,%rcx,8),%edx jmp 60f 50: movl %ecx,%edx 60: jmp copy_user_handle_tail /* ecx is zerorest also */ @@ -252,7 +252,7 @@ ENTRY(copy_user_generic_string) ret .section .fixup,"ax" -11: lea (%rdx,%rcx,8),%rcx +11: leal (%rdx,%rcx,8),%ecx 12: movl %ecx,%edx /* ecx is zerorest also */ jmp copy_user_handle_tail .previous -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
