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mm: multi-gen LRU: move lru_gen_add_mm() out of IRQ-off region
lru_gen_add_mm() has been added within an IRQ-off region in the commit
mentioned below. The other invocations of lru_gen_add_mm() are not within
an IRQ-off region.
The invocation within IRQ-off region is problematic on PREEMPT_RT because
the function is using a spin_lock_t which must not be used within
IRQ-disabled regions.
The other invocations of lru_gen_add_mm() occur while
task_struct::alloc_lock is acquired. Move lru_gen_add_mm() after
interrupts are enabled and before task_unlock().
Link: https://lkml.kernel.org/r/20221026134830.711887-1-bigeasy@linutronix.de
Fixes: bd74fdaea1
("mm: multi-gen LRU: support page table walks")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Yu Zhao <yuzhao@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
parent
1b9c918318
commit
dda1c41a07
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@ -1012,7 +1012,6 @@ static int exec_mmap(struct mm_struct *mm)
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active_mm = tsk->active_mm;
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tsk->active_mm = mm;
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tsk->mm = mm;
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lru_gen_add_mm(mm);
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/*
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* This prevents preemption while active_mm is being loaded and
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* it and mm are being updated, which could cause problems for
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@ -1025,6 +1024,7 @@ static int exec_mmap(struct mm_struct *mm)
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activate_mm(active_mm, mm);
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if (IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
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local_irq_enable();
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lru_gen_add_mm(mm);
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task_unlock(tsk);
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lru_gen_use_mm(mm);
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if (old_mm) {
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