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Henry Burns 1a87aa0359 mm/zsmalloc.c: migration can leave pages in ZS_EMPTY indefinitely 
In zs_page_migrate() we call putback_zspage() after we have finished
migrating all pages in this zspage.  However, the return value is
ignored.  If a zs_free() races in between zs_page_isolate() and
zs_page_migrate(), freeing the last object in the zspage,
putback_zspage() will leave the page in ZS_EMPTY for potentially an
unbounded amount of time.

To fix this, we need to do the same thing as zs_page_putback() does:
schedule free_work to occur.

To avoid duplicated code, move the sequence to a new
putback_zspage_deferred() function which both zs_page_migrate() and
zs_page_putback() call.

Link: http://lkml.kernel.org/r/20190809181751.219326-1-henryburns@google.com
Fixes: 48b4800a1c ("zsmalloc: page migration support")
Signed-off-by: Henry Burns <henryburns@google.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Henry Burns <henrywolfeburns@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-08-24 19:48:42 -07:00
arch parisc: fix compilation errrors 2019-08-24 19:48:42 -07:00
block
certs
crypto
Documentation
drivers - Fix for panics and network failures on PAE guests by Dexuan Cui. 2019-08-24 11:42:06 -07:00
fs userfaultfd_release: always remove uffd flags and clear vm_userfaultfd_ctx 2019-08-24 19:48:42 -07:00
include Pull request for 5.3-rc5 2019-08-23 14:53:09 -07:00
init
ipc
kernel psi: get poll_work to run when calling poll syscall next time 2019-08-24 19:48:42 -07:00
lib
LICENSES
mm mm/zsmalloc.c: migration can leave pages in ZS_EMPTY indefinitely 2019-08-24 19:48:42 -07:00
net Three important fixes tagged for stable (an indefinite hang, a crash on 2019-08-23 09:19:38 -07:00
samples
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security
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tools - Fix for panics and network failures on PAE guests by Dexuan Cui. 2019-08-24 11:42:06 -07:00
usr
virt KVM/arm fixes for 5.3, take #3 2019-08-24 12:46:30 +01:00
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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.