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@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
---
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@xxxxxxx>
+M: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
+M: Nick Piggin <npiggin@xxxxxxxxx>
+M: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
+L: linux-arch@xxxxxxxxxxxxxxx
+L: linux-mm@xxxxxxxxx
+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@xxxxxx>
L: linux-media@xxxxxxxxxxxxxxx
--
2.1.4
