path: root/Documentation/DocBook/drm.tmpl
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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-15 15:07:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-15 15:07:33 -0800
commit26178ec11ef3c6c814bf16a0a2b9c2f7242e3c64 (patch)
tree7c4e2506fb972eda829b3ff7f0eca3dbae8e25ae /Documentation/DocBook/drm.tmpl
parentx86: mm: move mmap_sem unlock from mm_fault_error() to caller (diff)
x86: mm: consolidate VM_FAULT_RETRY handling
The VM_FAULT_RETRY handling was confusing and incorrect for the case of returning to kernel mode. We need to handle the exception table fixup if we return to kernel mode due to a fatal signal - it will basically look to the kernel user mode access like the access failed due to the VM going away from udner it. Which is correct - the process is dying - and avoids the whole "repeat endless kernel page faults" case. Handling the VM_FAULT_RETRY early and in just one place also simplifies the mmap_sem handling, since once we've taken care of VM_FAULT_RETRY we know that we can just drop the lock. The remaining accounting and possible error handling is thread-local and does not need the mmap_sem. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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