malhuda/msm-4.14
1
0
Fork 0
mirror of https://github.com/rd-stuffs/msm-4.14.git synced 2025-02-20 11:45:48 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

mm/mglru: Move lru_gen_add_mm() out of IRQ-off region

Browse Source 
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: bd74fdaea1460 ("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>
Change-Id: I63ef837e43e727fd9223ad0e30170465b826a4bb
Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
This commit is contained in:
Sebastian Andrzej Siewior 2022-10-26 15:48:30 +02:00 committed by Richard Raya
parent 24cc942015
commit 35314d4a2d
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/exec.c
View File

@ -1067,7 +1067,6 @@ static int exec_mmap(struct mm_struct *mm)
active_mm = tsk->active_mm;
tsk->active_mm = mm;
tsk->mm = mm;
lru_gen_add_mm(mm);
/*
* This prevents preemption while active_mm is being loaded and
* it and mm are being updated, which could cause problems for
@ -1083,6 +1082,7 @@ static int exec_mmap(struct mm_struct *mm)
lru_gen_use_mm(mm);
tsk->mm->vmacache_seqnum = 0;
vmacache_flush(tsk);
lru_gen_add_mm(mm);
task_unlock(tsk);
if (old_mm) {
up_read(&old_mm->mmap_sem);