[tip:x86/asm] x86-64, asm: Directly access per-cpu IST
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From: tip-bot for Brian Gerst on 2 Aug 2010 11:20 Commit-ID: c15a5958a0b6dbf06b3c05972694f04a0c50a4cf Gitweb: http://git.kernel.org/tip/c15a5958a0b6dbf06b3c05972694f04a0c50a4cf Author: Brian Gerst <brgerst(a)gmail.com> AuthorDate: Sat, 31 Jul 2010 12:48:22 -0400 Committer: H. Peter Anvin <hpa(a)zytor.com> CommitDate: Sun, 1 Aug 2010 16:05:17 -0700 x86-64, asm: Directly access per-cpu IST Use a direct per-cpu reference for the IST instead of using a scratch register. Signed-off-by: Brian Gerst <brgerst(a)gmail.com> LKML-Reference: <1280594903-6341-1-git-send-email-brgerst(a)gmail.com> Signed-off-by: H. Peter Anvin <hpa(a)zytor.com> --- arch/x86/kernel/entry_64.S | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 4db7c4d..59af275 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1065,6 +1065,7 @@ ENTRY(\sym) END(\sym) .endm +#define INIT_TSS_IST(x) PER_CPU_VAR(init_tss) + (TSS_ist + ((x) - 1) * 8) .macro paranoidzeroentry_ist sym do_sym ist ENTRY(\sym) INTR_FRAME @@ -1076,10 +1077,9 @@ ENTRY(\sym) TRACE_IRQS_OFF movq %rsp,%rdi /* pt_regs pointer */ xorl %esi,%esi /* no error code */ - PER_CPU(init_tss, %r12) - subq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%r12) + subq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist) call \do_sym - addq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%r12) + addq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist) jmp paranoid_exit /* %ebx: no swapgs flag */ CFI_ENDPROC END(\sym) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |