Re: [Xen-devel] [PATCH] x86: fix GET_STACK_END

[Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>]

________________________________________
From: Wei Liu [wei.liu2@xxxxxxxxxx]
Sent: 24 January 2018 20:26
To: Xen-devel
Cc: Wei Liu; Jan Beulich; Andrew Cooper
Subject: [PATCH] x86: fix GET_STACK_END

AIUI the purpose of having the .if directive is to make GET_STACK_END
work with any general purpose registers. The code as-is would produce
the wrong result for r8. Fix it.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Oops.  Acked-by: Andrew Cooper ≤andrew.cooper3@xxxxxxxxxx≥

---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/include/asm-x86/asm_defns.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-x86/asm_defns.h b/xen/include/asm-x86/asm_defns.h
index d2d91ca1fa..6a2b833db6 100644
--- a/xen/include/asm-x86/asm_defns.h
+++ b/xen/include/asm-x86/asm_defns.h
@@ -120,7 +120,7 @@ void ret_from_intr(void);

 #define STACK_CPUINFO_FIELD(field) (1 - CPUINFO_sizeof + CPUINFO_##field)
 #define GET_STACK_END(reg)                        \
-        .if .Lr##reg > 8;                         \
+        .if .Lr##reg >= 8;                        \
         movq $STACK_SIZE-1, %r##reg;              \
         .else;                                    \
         movl $STACK_SIZE-1, %e##reg;              \
--
2.11.0


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