Commit fe201641 authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/mm: Select ARCH_WANT_IRQS_OFF_ACTIVATE_MM 



Select ARCH_WANT_IRQS_OFF_ACTIVATE_MM so that activate_mm() is called with
irqs disabled. This allows to call switch_mm_irqs_off() instead of
switch_mm() and saves two local_irq_save() / local_irq_restore() pairs.

Reviewed-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 8b72f5a9

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -146,6 +146,7 @@ config S390 
	select ARCH_WANTS_NO_INSTR

	select ARCH_WANT_DEFAULT_BPF_JIT

	select ARCH_WANT_IPC_PARSE_VERSION

	select ARCH_WANT_IRQS_OFF_ACTIVATE_MM

	select ARCH_WANT_KERNEL_PMD_MKWRITE

	select ARCH_WANT_LD_ORPHAN_WARN

	select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP

arch/s390/include/asm/mmu_context.h

+1 −5
Original line number Diff line number Diff line
@@ -124,17 +124,13 @@ static inline void finish_arch_post_lock_switch(void) 
static inline void activate_mm(struct mm_struct *prev,

                               struct mm_struct *next)

{

	unsigned long flags;



	switch_mm(prev, next, current);

	switch_mm_irqs_off(prev, next, current);

	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));

	local_irq_save(flags);

	if (test_thread_flag(TIF_ASCE_PRIMARY))

		local_ctl_load(1, &get_lowcore()->kernel_asce);

	else

		local_ctl_load(1, &get_lowcore()->user_asce);

	local_ctl_load(7, &get_lowcore()->user_asce);

	local_irq_restore(flags);

}



#include <asm-generic/mmu_context.h>