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Yue Hu 77a01e3357 mm/cma.c: fix the bitmap status to show failed allocation reason [ Upstream commit `2b59e01a3a` ] Currently one bit in cma bitmap represents number of pages rather than one page, cma->count means cma size in pages. So to find available pages via find_next_zero_bit()/find_next_bit() we should use cma size not in pages but in bits although current free pages number is correct due to zero value of order_per_bit. Once order_per_bit is changed the bitmap status will be incorrect. The size input in cma_debug_show_areas() is not correct. It will affect the available pages at some position to debug the failure issue. This is an example with order_per_bit = 1 Before this change: [ 4.120060] cma: number of available pages: 1@93+4@108+7@121+7@137+7@153+7@169+7@185+7@201+3@213+3@221+3@229+3@237+3@245+3@253+3@261+3@269+3@277+3@285+3@293+3@301+3@309+3@317+3@325+19@333+15@369+512@512=> 638 free of 1024 total pages After this change: [ 4.143234] cma: number of available pages: 2@93+8@108+14@121+14@137+14@153+14@169+14@185+14@201+6@213+6@221+6@229+6@237+6@245+6@253+6@261+6@269+6@277+6@285+6@293+6@301+6@309+6@317+6@325+38@333+30@369=> 252 free of 1024 total pages Obviously the bitmap status before is incorrect. Link: http://lkml.kernel.org/r/20190320060829.9144-1-zbestahu@gmail.com Signed-off-by: Yue Hu <huyue2@yulong.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Laura Abbott <labbott@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-06-15 11:54:01 +02:00
arch	ARM: prevent tracing IPI_CPU_BACKTRACE	2019-06-15 11:54:00 +02:00
block	block: sed-opal: fix IOC_OPAL_ENABLE_DISABLE_MBR	2019-05-31 06:46:24 -07:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: ccm - fix incompatibility between "ccm" and "ccm_base"	2019-05-22 07:37:43 +02:00
Documentation	doc: Cope with Sphinx logging deprecations	2019-06-09 09:17:21 +02:00
drivers	drm/pl111: Initialize clock spinlock early	2019-06-15 11:54:00 +02:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	fs/fat/file.c: issue flush after the writeback of FAT	2019-06-15 11:53:59 +02:00
include	ipv4: Define __ipv4_neigh_lookup_noref when CONFIG_INET is disabled	2019-06-11 12:20:57 +02:00
init	initramfs: free initrd memory if opening /initrd.image fails	2019-06-15 11:54:01 +02:00
ipc	ipc: prevent lockup on alloc_msg and free_msg	2019-06-15 11:54:00 +02:00
kernel	sysctl: return -EINVAL if val violates minmax	2019-06-15 11:53:59 +02:00
lib	test_firmware: Use correct snprintf() limit	2019-06-11 12:20:54 +02:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm/cma.c: fix the bitmap status to show failed allocation reason	2019-06-15 11:54:01 +02:00
net	ethtool: check the return value of get_regs_len	2019-06-11 12:20:57 +02:00
samples	samples: mei: use /dev/mei0 instead of /dev/mei	2019-02-15 08:10:11 +01:00
scripts	gcc-plugins: Fix build failures under Darwin host	2019-06-09 09:17:22 +02:00
security	evm: check hash algorithm passed to init_desc()	2019-06-09 09:17:21 +02:00
sound	ALSA: hda/realtek - Improve the headset mic for Acer Aspire laptops	2019-06-09 09:17:17 +02:00
tools	jump_label: move 'asm goto' support test to Kconfig	2019-06-04 08:02:34 +02:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID	2019-06-09 09:17:18 +02:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	platform/x86: Add Intel AtomISP2 dummy / power-management driver	2019-04-20 09:16:02 +02:00
Makefile	Linux 4.19.50	2019-06-11 12:20:57 +02:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

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.