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 <pet...@infradead.org> Cc: Nicholas Piggin <npig...@gmail.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com> Cc: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Michal Hocko <mho...@suse.com> Signed-off-by: Will Deacon <will.dea...@arm.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.dea...@arm.com> +M: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com> +M: Nick Piggin <npig...@gmail.com> +M: Peter Zijlstra <pet...@infradead.org> +L: linux-a...@vger.kernel.org +L: linux...@kvack.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 <cr...@iki.fi> L: linux-me...@vger.kernel.org -- 2.1.4