linux-kernel - [PATCH v2 5/5] MAINTAINERS: Add entry for MMU GATHER AND TLB INVALIDATION

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Message-Id: <1536061533-16188-6-git-send-email-will.deacon@arm.com>
Date:   Tue,  4 Sep 2018 12:45:33 +0100
From:   Will Deacon <will.deacon@....com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, npiggin@...il.com, linux-mm@...ck.org,
        kirill.shutemov@...ux.intel.com, akpm@...ux-foundation.org,
        mhocko@...e.com, aneesh.kumar@...ux.vnet.ibm.com
Subject: [PATCH v2 5/5] MAINTAINERS: Add entry for MMU GATHER AND TLB INVALIDATION

We recently had to debug a TLB invalidation problem on the munmap()
path, which was made more difficult than necessary because:

  (a) The MMU gather code had changed without people realising
  (b) Many people subtly misunderstood the operation of the MMU gather
      code and its interactions with RCU and arch-specific TLB invalidation
  (c) Untangling the intended behaviour involved educated guesswork and
      plenty of discussion

Hopefully, we can avoid getting into this mess again by designating a
cross-arch group of people to look after this code. It is not intended
that they will have a separate tree, but they at least provide a point
of contact for anybody working in this area and can co-ordinate any
proposed future changes to the internal API.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 MAINTAINERS | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 9ad052aeac39..e490a0a0605a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9681,6 +9681,18 @@ S:	Maintained
 F:	arch/arm/boot/dts/mmp*
 F:	arch/arm/mach-mmp/
 
+MMU GATHER AND TLB INVALIDATION
+M:	Will Deacon <will.deacon@....com>
+M:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
+M:	Nick Piggin <npiggin@...il.com>
+M:	Peter Zijlstra <peterz@...radead.org>
+L:	linux-arch@...r.kernel.org
+L:	linux-mm@...ck.org
+S:	Maintained
+F:	arch/*/include/asm/tlb.h
+F:	include/asm-generic/tlb.h
+F:	mm/mmu_gather.c
+
 MN88472 MEDIA DRIVER
 M:	Antti Palosaari <crope@....fi>
 L:	linux-media@...r.kernel.org
-- 
2.1.4