Patch "x86/mm: Use new merged flush logic in arch_tlbbatch_flush()" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    x86/mm: Use new merged flush logic in arch_tlbbatch_flush()

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-mm-use-new-merged-flush-logic-in-arch_tlbbatch_flush.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 3f79e4c7c9c2f5c30751ea5c8dd9fd1d56b81947 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@kernel.org>
Date: Sun, 28 May 2017 10:00:13 -0700
Subject: x86/mm: Use new merged flush logic in arch_tlbbatch_flush()

From: Andy Lutomirski <luto@kernel.org>

commit 3f79e4c7c9c2f5c30751ea5c8dd9fd1d56b81947 upstream.

Now there's only one copy of the local tlb flush logic for
non-kernel pages on SMP kernels.

The only functional change is that arch_tlbbatch_flush() will now
leave_mm() on the local CPU if that CPU is in the batch and is in
TLBSTATE_LAZY mode.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Eduardo Valentin <eduval@amazon.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/mm/tlb.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -405,12 +405,8 @@ void arch_tlbbatch_flush(struct arch_tlb
 
 	int cpu = get_cpu();
 
-	if (cpumask_test_cpu(cpu, &batch->cpumask)) {
-		count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
-		local_flush_tlb();
-		trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
-	}
-
+	if (cpumask_test_cpu(cpu, &batch->cpumask))
+		flush_tlb_func_local(&info, TLB_LOCAL_SHOOTDOWN);
 	if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids)
 		flush_tlb_others(&batch->cpumask, &info);
 	cpumask_clear(&batch->cpumask);


Patches currently in stable-queue which might be from luto@kernel.org are

queue-4.9/x86-mm-refactor-flush_tlb_mm_range-to-merge-local-and-remote-cases.patch
queue-4.9/x86-mm-pass-flush_tlb_info-to-flush_tlb_others-etc.patch
queue-4.9/x86-mm-rework-lazy-tlb-to-track-the-actual-loaded-mm.patch
queue-4.9/x86-mm-kvm-teach-kvm-s-vmx-code-that-cr3-isn-t-a-constant.patch
queue-4.9/x86-mm-use-new-merged-flush-logic-in-arch_tlbbatch_flush.patch
queue-4.9/x86-kvm-vmx-simplify-segment_base.patch
queue-4.9/x86-entry-unwind-create-stack-frames-for-saved-interrupt-registers.patch
queue-4.9/x86-mm-reduce-indentation-in-flush_tlb_func.patch
queue-4.9/x86-mm-remove-the-up-asm-tlbflush.h-code-always-use-the-formerly-smp-code.patch
queue-4.9/x86-mm-reimplement-flush_tlb_page-using-flush_tlb_mm_range.patch
queue-4.9/mm-x86-mm-make-the-batched-unmap-tlb-flush-api-more-generic.patch
queue-4.9/x86-kvm-vmx-defer-tr-reload-after-vm-exit.patch
queue-4.9/x86-mm-change-the-leave_mm-condition-for-local-tlb-flushes.patch
queue-4.9/x86-mm-be-more-consistent-wrt-page_shift-vs-page_size-in-tlb-flush-code.patch