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Commit 4b2a8b60 authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Martin Schwidefsky
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[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: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 8283cb43
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+0 −4
Original line number Diff line number Diff line
@@ -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,