Commit 4b2a8b60 authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Martin Schwidefsky
Browse files

[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

arch/s390/kernel/setup.c

+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,