[PATCH] x86-64/asm: use negative immediates for stack adjustments

[Jan Beulich]

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@xxxxxxxx>
---
 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
 



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