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Date: Mon, 01 Jun 2015 13:02:55 +0100 From: "Jan Beulich" <JBeulich@...e.com> To: <mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com> Cc: <linux-kernel@...r.kernel.org> Subject: [PATCH] x86-64/asm: use negative immediates for stack adjustments Doing so allows adjustments by 128 bytes (occurring for REMOVE_PT_GPREGS_FROM_STACK 8 uses) to be expressed with a single byte immediate. Signed-off-by: Jan Beulich <jbeulich@...e.com> --- arch/x86/include/asm/calling.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- 4.1-rc6/arch/x86/include/asm/calling.h +++ 4.1-rc6-x86_64-invert-stack-adjust/arch/x86/include/asm/calling.h @@ -91,7 +91,7 @@ For 32-bit we have the following convent #define SIZEOF_PTREGS 21*8 .macro ALLOC_PT_GPREGS_ON_STACK addskip=0 - subq $15*8+\addskip, %rsp + addq $-(15*8+\addskip), %rsp CFI_ADJUST_CFA_OFFSET 15*8+\addskip .endm @@ -204,7 +204,7 @@ For 32-bit we have the following convent .endm .macro REMOVE_PT_GPREGS_FROM_STACK addskip=0 - addq $15*8+\addskip, %rsp + subq $-(15*8+\addskip), %rsp CFI_ADJUST_CFA_OFFSET -(15*8+\addskip) .endm -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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