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[S390] kernel: Disable switch_amode by default

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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>
This commit is contained in:
Gerald Schaefer 2009-03-26 15:24:22 +01:00 committed by Martin Schwidefsky
parent 8283cb43ab
commit 4b2a8b6043
1 changed files with 0 additions and 4 deletions
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arch/s390/kernel/setup.c
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@ -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,