708a507af0
Refresh kernel patches for generic kernel 5.15 due to new backport version of MGLRU patchset. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
From 255bb0ac393f1c2818cd75af45a9226300ab3daf Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Wed, 26 Oct 2022 15:48:30 +0200
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Subject: [PATCH 15/29] mm: multi-gen LRU: move lru_gen_add_mm() out of IRQ-off
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region
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lru_gen_add_mm() has been added within an IRQ-off region in the commit
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mentioned below. The other invocations of lru_gen_add_mm() are not within
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an IRQ-off region.
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The invocation within IRQ-off region is problematic on PREEMPT_RT because
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the function is using a spin_lock_t which must not be used within
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IRQ-disabled regions.
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The other invocations of lru_gen_add_mm() occur while
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task_struct::alloc_lock is acquired. Move lru_gen_add_mm() after
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interrupts are enabled and before task_unlock().
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Link: https://lkml.kernel.org/r/20221026134830.711887-1-bigeasy@linutronix.de
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Fixes: bd74fdaea1460 ("mm: multi-gen LRU: support page table walks")
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Acked-by: Yu Zhao <yuzhao@google.com>
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Cc: Al Viro <viro@zeniv.linux.org.uk>
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Cc: "Eric W . Biederman" <ebiederm@xmission.com>
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Cc: Kees Cook <keescook@chromium.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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---
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fs/exec.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/fs/exec.c
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+++ b/fs/exec.c
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@@ -1013,7 +1013,6 @@ static int exec_mmap(struct mm_struct *m
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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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@@ -1028,6 +1027,7 @@ static int exec_mmap(struct mm_struct *m
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local_irq_enable();
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tsk->mm->vmacache_seqnum = 0;
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vmacache_flush(tsk);
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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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