The patch titled
Subject: mm/tlbbatch: Introduce arch_flush_tlb_batched_pending()
has been added to the -mm mm-unstable branch. Its filename is
mm-tlbbatch-introduce-arch_flush_tlb_batched_pending.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-tlbbatch-introduce-arch_flush_tlb_batched_pending.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
Subject: mm/tlbbatch: Introduce arch_flush_tlb_batched_pending()
Date: Mon, 17 Jul 2023 21:10:03 +0800
Currently we'll flush the mm in flush_tlb_batched_pending() to avoid race
between reclaim unmaps pages by batched TLB flush and mprotect/munmap/etc.
Other architectures like arm64 may only need a synchronization
barrier(dsb) here rather than a full mm flush. So add
arch_flush_tlb_batched_pending() to allow an arch-specific implementation
here. This intends no functional changes on x86 since still a full mm
flush for x86.
Link: https://lkml.kernel.org/r/20230717131004.12662-4-yangyicong@xxxxxxxxxx
Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Barry Song <baohua@xxxxxxxxxx>
Cc: Barry Song <v-songbaohua@xxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Darren Hart <darren@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: lipeifeng <lipeifeng@xxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Nadav Amit <namit@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Punit Agrawal <punit.agrawal@xxxxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Steven Miao <realmz6@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Xin Hao <xhao@xxxxxxxxxxxxxxxxx>
Cc: Zeng Tao <prime.zeng@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/tlbflush.h | 5 +++++
mm/rmap.c | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/tlbflush.h~mm-tlbbatch-introduce-arch_flush_tlb_batched_pending
+++ a/arch/x86/include/asm/tlbflush.h
@@ -284,6 +284,11 @@ static inline void arch_tlbbatch_add_pen
cpumask_or(&batch->cpumask, &batch->cpumask, mm_cpumask(mm));
}
+static inline void arch_flush_tlb_batched_pending(struct mm_struct *mm)
+{
+ flush_tlb_mm(mm);
+}
+
extern void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch);
static inline bool pte_flags_need_flush(unsigned long oldflags,
--- a/mm/rmap.c~mm-tlbbatch-introduce-arch_flush_tlb_batched_pending
+++ a/mm/rmap.c
@@ -717,7 +717,7 @@ void flush_tlb_batched_pending(struct mm
int flushed = batch >> TLB_FLUSH_BATCH_FLUSHED_SHIFT;
if (pending != flushed) {
- flush_tlb_mm(mm);
+ arch_flush_tlb_batched_pending(mm);
/*
* If the new TLB flushing is pending during flushing, leave
* mm->tlb_flush_batched as is, to avoid losing flushing.
_
Patches currently in -mm which might be from yangyicong@xxxxxxxxxxxxx are
mm-tlbbatch-introduce-arch_flush_tlb_batched_pending.patch
