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Filename Latest commit message Latest commit date
Aneesh Kumar K.V 047e6575ae powerpc/mm: Fixup tlbie vs mtpidr/mtlpidr ordering issue on POWER9 
On POWER9, under some circumstances, a broadcast TLB invalidation will
fail to invalidate the ERAT cache on some threads when there are
parallel mtpidr/mtlpidr happening on other threads of the same core.
This can cause stores to continue to go to a page after it's unmapped.

The workaround is to force an ERAT flush using PID=0 or LPID=0 tlbie
flush. This additional TLB flush will cause the ERAT cache
invalidation. Since we are using PID=0 or LPID=0, we don't get
filtered out by the TLB snoop filtering logic.

We need to still follow this up with another tlbie to take care of
store vs tlbie ordering issue explained in commit:
a5d4b5891c ("powerpc/mm: Fixup tlbie vs store ordering issue on
POWER9"). The presence of ERAT cache implies we can still get new
stores and they may miss store queue marking flush.

Cc: stable@vger.kernel.org
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190924035254.24612-3-aneesh.kumar@linux.ibm.com
2019-09-24 20:58:55 +10:00
arch powerpc/mm: Fixup tlbie vs mtpidr/mtlpidr ordering issue on POWER9 2019-09-24 20:58:55 +10:00
block
certs
crypto
Documentation powerpc updates for 5.4 2019-09-20 11:48:06 -07:00
drivers powerpc updates for 5.4 2019-09-20 11:48:06 -07:00
fs powerpc updates for 5.4 2019-09-20 11:48:06 -07:00
include powerpc updates for 5.4 2019-09-20 11:48:06 -07:00
init
ipc
kernel powerpc updates for 5.4 2019-09-20 11:48:06 -07:00
lib lz4: do not export static symbol 2019-09-20 09:06:26 -07:00
LICENSES
mm
net
samples
scripts Tracing updates: 2019-09-20 11:19:48 -07:00
security
sound
tools powerpc/tm: Add tm-poison test 2019-09-21 08:36:53 +10:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
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MAINTAINERS Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rkuo/linux-hexagon-kernel 2019-09-20 11:28:43 -07:00
Makefile
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.

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.