From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Disable switch_amode by default because pagetable walk on pre z9
hardware has negative performance impact.
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
---
arch/s390/kernel/setup.c | 4 ----
1 file changed, 4 deletions(-)
Index: quilt-2.6/arch/s390/kernel/setup.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/setup.c
+++ quilt-2.6/arch/s390/kernel/setup.c
@@ -301,11 +301,7 @@ static int __init early_parse_mem(char *
early_param("mem", early_parse_mem);
#ifdef CONFIG_S390_SWITCH_AMODE
-#ifdef CONFIG_PGSTE
-unsigned int switch_amode = 1;
-#else
unsigned int switch_amode = 0;
-#endif
EXPORT_SYMBOL_GPL(switch_amode);
static int set_amode_and_uaccess(unsigned long user_amode,
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
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