Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
Peter Xu
authored
This part was overlooked when reworking the gup code on multiple retries. When we get the 2nd+ retry, we'll be with TRIED flag set. Current code will bail out on the 2nd retry because the !TRIED check will fail so the retry logic will be skipped. What's worse is that, it will also return zero which errornously hints the caller that the page is faulted in while it's not. The !TRIED flag check seems to not be needed even before the mutliple retries change because if we get a VM_FAULT_RETRY, it must be the 1st retry, and we should not have TRIED set for that. Fix it by removing the !TRIED check, at the meantime check against fatal signals properly before the page fault so we can still properly respond to the user killing the process during retries. Fixes: 4426e945 ("mm/gup: allow VM_FAULT_RETRY for multiple times") Reported-by:Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
Peter Xu <peterx@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Brian Geffon <bgeffon@google.com> Link: http://lkml.kernel.org/r/20200502003523.8204-1-peterx@redhat.com Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>