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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2009-03-26 15:24:22 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-26 15:24:18 +0100
commit4b2a8b6043979f1e6cc8aaa4116c95b31ae942ec (patch)
tree41045e6d0a16b0e61ec4c8705711044f43886827 /arch
parent8283cb43ab3e92a039d3486a0f6253df95a5fa55 (diff)
[S390] kernel: Disable switch_amode by default
Disable switch_amode by default because pagetable walk on pre z9 hardware has negative performance impact. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/setup.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 0b8ad7b4f8f..dd3c5173627 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -301,11 +301,7 @@ static int __init early_parse_mem(char *p)
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,