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Uladzislau Rezki (Sony) 060650a2a0 mm/vmalloc: add more comments to the adjust_va_to_fit_type() 
When fit type is NE_FIT_TYPE there is a need in one extra object.
Usually the "ne_fit_preload_node" per-CPU variable has it and there is
no need in GFP_NOWAIT allocation, but there are exceptions.

This commit just adds more explanations, as a result giving answers on
questions like when it can occur, how often, under which conditions and
what happens if GFP_NOWAIT gets failed.

Link: http://lkml.kernel.org/r/20191016095438.12391-3-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-12-01 12:59:05 -08:00
arch ARC: mm: remove __ARCH_USE_5LEVEL_HACK 2019-12-01 06:29:19 -08:00
block
certs
crypto
Documentation Documentation/admin-guide/cgroup-v2.rst: document why inactive_X + active_X may not equal X 2019-12-01 06:29:18 -08:00
drivers drivers/base/memory.c: drop the mem_sysfs_mutex 2019-12-01 12:59:04 -08:00
fs fs/direct-io.c: keep dio_warn_stale_pagecache() when CONFIG_BLOCK=n 2019-12-01 06:29:18 -08:00
include include/linux/memory_hotplug.h: move definitions of {set,clear}_zone_contiguous 2019-12-01 12:59:04 -08:00
init
ipc
kernel mm/mmap.c: use IS_ERR_VALUE to check return value of get_unmapped_area 2019-12-01 06:29:19 -08:00
lib rss_stat: add support to detect RSS updates of external mm 2019-12-01 06:29:18 -08:00
LICENSES
mm mm/vmalloc: add more comments to the adjust_va_to_fit_type() 2019-12-01 12:59:05 -08:00
net
samples
scripts
security
sound
tools memfd: add test for COW on MAP_PRIVATE and F_SEAL_FUTURE_WRITE mappings 2019-12-01 12:59:03 -08:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
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.