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s390/mm: Select ARCH_WANT_IRQS_OFF_ACTIVATE_MM

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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: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2025-04-09 15:01:51 +02:00
parent 8b72f5a97b
commit fe20164177
2 changed files with 2 additions and 5 deletions
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1
arch/s390/Kconfig
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@@ -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

6
arch/s390/include/asm/mmu_context.h
View File

@@ -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>