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58a18fe95e
Remove the code to sync the vmalloc and ioremap ranges for x86-64. The page-table pages are all pre-allocated so that synchronization is no longer necessary. This is a patch that already went into the kernel as: commit8bb9bf242d("x86/mm/64: Do not sync vmalloc/ioremap mappings") But it had to be reverted later because it unveiled a bug from: commit6eb82f9940("x86/mm: Pre-allocate P4D/PUD pages for vmalloc area") The bug in that commit causes the P4D/PUD pages not to be correctly allocated, making the synchronization still necessary. That issue got fixed meanwhile upstream: commit995909a4e2("x86/mm/64: Do not dereference non-present PGD entries") With that fix it is safe again to remove the page-table synchronization for vmalloc/ioremap ranges on x86-64. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200814151947.26229-2-joro@8bytes.org
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.