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Chris Wilson 2214ddc2fd drm/mm: Allow drm_mm_initialized() to be used outside of the locks Mark up the potential racy read in drm_mm_initialized(), as we want a cheap and cheerful check: [ 121.098731] BUG: KCSAN: data-race in _i915_gem_object_create_stolen [i915] / rm_hole [ 121.098766] [ 121.098789] write (marked) to 0xffff8881f01ed330 of 8 bytes by task 3568 on cpu 3: [ 121.098831] rm_hole+0x64/0x140 [ 121.098860] drm_mm_insert_node_in_range+0x3d3/0x6c0 [ 121.099254] i915_gem_stolen_insert_node_in_range+0x91/0xe0 [i915] [ 121.099646] _i915_gem_object_create_stolen+0x9d/0x100 [i915] [ 121.100047] i915_gem_object_create_region+0x7a/0xa0 [i915] [ 121.100451] i915_gem_object_create_stolen+0x33/0x50 [i915] [ 121.100849] intel_engine_create_ring+0x1af/0x280 [i915] [ 121.101242] __execlists_context_alloc+0xce/0x3d0 [i915] [ 121.101635] execlists_context_alloc+0x25/0x40 [i915] [ 121.102030] intel_context_alloc_state+0xb6/0xf0 [i915] [ 121.102420] __intel_context_do_pin+0x1ff/0x220 [i915] [ 121.102815] i915_gem_do_execbuffer+0x46b4/0x4c20 [i915] [ 121.103211] i915_gem_execbuffer2_ioctl+0x2c3/0x580 [i915] [ 121.103244] drm_ioctl_kernel+0xe4/0x120 [ 121.103269] drm_ioctl+0x297/0x4c7 [ 121.103296] ksys_ioctl+0x89/0xb0 [ 121.103321] __x64_sys_ioctl+0x42/0x60 [ 121.103349] do_syscall_64+0x6e/0x2c0 [ 121.103377] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 121.103403] [ 121.103426] read to 0xffff8881f01ed330 of 8 bytes by task 3109 on cpu 1: [ 121.103819] _i915_gem_object_create_stolen+0x30/0x100 [i915] [ 121.104228] i915_gem_object_create_region+0x7a/0xa0 [i915] [ 121.104631] i915_gem_object_create_stolen+0x33/0x50 [i915] [ 121.105025] intel_engine_create_ring+0x1af/0x280 [i915] [ 121.105420] __execlists_context_alloc+0xce/0x3d0 [i915] [ 121.105818] execlists_context_alloc+0x25/0x40 [i915] [ 121.106202] intel_context_alloc_state+0xb6/0xf0 [i915] [ 121.106595] __intel_context_do_pin+0x1ff/0x220 [i915] [ 121.106985] i915_gem_do_execbuffer+0x46b4/0x4c20 [i915] [ 121.107375] i915_gem_execbuffer2_ioctl+0x2c3/0x580 [i915] [ 121.107409] drm_ioctl_kernel+0xe4/0x120 [ 121.107437] drm_ioctl+0x297/0x4c7 [ 121.107464] ksys_ioctl+0x89/0xb0 [ 121.107489] __x64_sys_ioctl+0x42/0x60 [ 121.107511] do_syscall_64+0x6e/0x2c0 [ 121.107535] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20200309121529.16497-1-chris@chris-wilson.co.uk		2020-03-16 10:31:21 +00:00
Documentation	dt-bindings: display: Add idk-1110wr binding	2020-03-14 08:36:10 +01:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
arch	drm/omap: Switch the HDMI and VENC outputs to drm_bridge	2020-02-26 13:32:00 +02:00
block	block-5.6-2020-02-05	2020-02-06 06:15:23 +00:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	s390 updates for 5.6-rc2	2020-02-15 13:10:38 -08:00
drivers	drm/edid: Distribute switch variables for initialization	2020-03-16 10:54:08 +01:00
fs	for-5.6-rc1-tag	2020-02-16 11:43:45 -08:00
include	drm/mm: Allow drm_mm_initialized() to be used outside of the locks	2020-03-16 10:31:21 +00:00
init	Various fixes:	2020-02-11 16:39:18 -08:00
ipc	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
kernel	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2020-02-15 12:51:22 -08:00
lib	Various fixes:	2020-02-11 16:39:18 -08:00
mm	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
net	NFS Client Bugfixes for Linux 5.6-rc2	2020-02-14 14:46:11 -08:00
samples	Kbuild updates for v5.6 (2nd)	2020-02-09 16:05:50 -08:00
scripts	kbuild: fix mismatch between .version and include/generated/compile.h	2020-02-11 05:18:40 +09:00
security	selinux/stable-5.6 PR 20200210	2020-02-10 16:51:35 -08:00
sound	ALSA: pcm: Fix double hw_free calls	2020-02-13 16:30:22 +01:00
tools	Bugfixes and improvements to selftests. On top of this, Mauro converted the	2020-02-16 13:01:42 -08:00
usr	Kbuild updates for v5.6 (2nd)	2020-02-09 16:05:50 -08:00
virt	KVM: Disable preemption in kvm_get_running_vcpu()	2020-02-12 12:19:35 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig	…
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
.mailmap	A handful of small documentation fixes that wandered in.	2020-02-07 13:03:10 -08:00
COPYING	…
CREDITS	open: introduce openat2(2) syscall	2020-01-18 09:19:18 -05:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	MAINTAINERS: adjust to reservation.h renaming	2020-03-06 12:52:46 +01:00
Makefile	Linux 5.6-rc2	2020-02-16 13:16:59 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -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.

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.