Commit 4b2a8b60 authored Mar 26, 2009 by Gerald Schaefer Committed by Martin Schwidefsky Mar 26, 2009

[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>

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,