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Filename Latest commit message Latest commit date
Rik van Riel 50c150f262 Revert "mm: always flush VMA ranges affected by zap_page_range" 
There was a bug in Linux that could cause madvise (and mprotect?) system
calls to return to userspace without the TLB having been flushed for all
the pages involved.

This could happen when multiple threads of a process made simultaneous
madvise and/or mprotect calls.

This was noticed in the summer of 2017, at which time two solutions
were created:

  56236a5955 ("mm: refactor TLB gathering API")
  99baac21e4 ("mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem")
and
  4647706ebe ("mm: always flush VMA ranges affected by zap_page_range")

We need only one of these solutions, and the former appears to be a
little more efficient than the latter, so revert that one.

This reverts 4647706ebe ("mm: always flush VMA ranges affected by
zap_page_range")

Link: http://lkml.kernel.org/r/20180706131019.51e3a5f0@imladris.surriel.com
Signed-off-by: Rik van Riel <riel@surriel.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-08-17 16:20:31 -07:00
arch mm: convert return type of handle_mm_fault() caller to vm_fault_t 2018-08-17 16:20:28 -07:00
block
certs
crypto
Documentation tools/vm/page-types.c: add support for idle page tracking 2018-08-17 16:20:28 -07:00
drivers mm: provide a fallback for PAGE_KERNEL_RO for architectures 2018-08-17 16:20:29 -07:00
firmware
fs mm: add SHRINK_EMPTY shrinker methods return value 2018-08-17 16:20:31 -07:00
include mm: add SHRINK_EMPTY shrinker methods return value 2018-08-17 16:20:31 -07:00
init mm: introduce CONFIG_MEMCG_KMEM as combination of CONFIG_MEMCG && !CONFIG_SLOB 2018-08-17 16:20:30 -07:00
ipc
kernel kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN 2018-08-17 16:20:30 -07:00
lib
LICENSES
mm Revert "mm: always flush VMA ranges affected by zap_page_range" 2018-08-17 16:20:31 -07:00
net
samples
scripts
security
sound
tools tools/vm/page-types.c: add support for idle page tracking 2018-08-17 16:20:28 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
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MAINTAINERS
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README

README 

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.