+ mm-tlbbatch-introduce-arch_flush_tlb_batched_pending.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

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

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------------------------------------------------------
From: Yicong Yang <yangyicong@hisilicon.com>
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@huawei.com
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Barry Song <baohua@kernel.org>
Cc: Barry Song <v-songbaohua@oppo.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Darren Hart <darren@os.amperecomputing.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: lipeifeng <lipeifeng@oppo.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Nadav Amit <namit@vmware.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Punit Agrawal <punit.agrawal@bytedance.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Cc: Zeng Tao <prime.zeng@hisilicon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@hisilicon.com are

mm-tlbbatch-introduce-arch_flush_tlb_batched_pending.patch