Suren Baghdasaryan
2e2ca5a627
Speculative page fault checks pmd to be valid before starting to handle the page fault and pte_alloc() should do nothing if pmd stays valid. If pmd gets changed during speculative page fault, we will detect the change later and retry with mmap_lock. Therefore pte_alloc() can be safely skipped and this prevents the racy pmd_lock() call which can access pmd->ptl after pmd was cleared. Bug: 257443051 Change-Id: Iec57df5530dba6e0e0bdf9f7500f910851c3d3fd Signed-off-by: Suren Baghdasaryan <surenb@google.com> Git-commit: 1169f70f8f15ea4378ecadb9baba8791824c8b2a Git-repo: https://android.googlesource.com/kernel/common/ Signed-off-by: Srinivasarao Pathipati <quic_c_spathi@quicinc.com>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.