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(parent: f32471e) | patch
mm/hmm: comment on VM_FAULT_RETRY semantics in handle_mm_fault
authorJason Gunthorpe <jgg@mellanox.com>
Wed, 24 Jul 2019 06:52:58 +0000 (08:52 +0200)
committerJason Gunthorpe <jgg@mellanox.com>
Thu, 25 Jul 2019 19:14:40 +0000 (16:14 -0300)
commite709accc7670a07b2e5186449f0640c2416662ec
treee110126f0ec2ba46b4712d2556b19545400e4f67tree | snapshot
parentf32471e2cf87112b8f5dc10469b27c39c1a41722commit | diff
mm/hmm: comment on VM_FAULT_RETRY semantics in handle_mm_fault

The magic dropping of mmap_sem when handle_mm_fault returns VM_FAULT_RETRY
is rather subtile.  Add a comment explaining it.

Link: https://lore.kernel.org/r/20190724065258.16603-8-hch@lst.de
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
[hch: wrote a changelog]
Signed-off-by: Christoph Hellwig <hch@lst.de>
mm/hmm.c diff | blob | history
Domain: System / Kernel;