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s390/mm: ensure switch_mm() is executed with interrupts disabled

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Architecture callback switch_mm() is allowed to be called with
enabled interrupts. However, our implementation of switch_mm()
does not expect that. Let's follow other architectures and make
sure switch_mm() is always executed with interrupts disabled,
regardless of what happens with the generic kernel code in the
future.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2021-05-06 20:06:00 +02:00 committed by Vasily Gorbik
parent 27c1dac0b6
commit bdb8c9353e
1 changed files with 13 additions and 2 deletions
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15
arch/s390/include/asm/mmu_context.h
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@ -70,8 +70,8 @@ static inline int init_new_context(struct task_struct *tsk,
return 0; return 0;
} }
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, static inline void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk) struct task_struct *tsk)
{ {
int cpu = smp_processor_id(); int cpu = smp_processor_id();
@ -85,6 +85,17 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
if (prev != next) if (prev != next)
cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
} }
#define switch_mm_irqs_off switch_mm_irqs_off
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
unsigned long flags;
local_irq_save(flags);
switch_mm_irqs_off(prev, next, tsk);
local_irq_restore(flags);
}
#define finish_arch_post_lock_switch finish_arch_post_lock_switch #define finish_arch_post_lock_switch finish_arch_post_lock_switch
static inline void finish_arch_post_lock_switch(void) static inline void finish_arch_post_lock_switch(void)