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Douglas Anderson 81eaadcae8 kgdboc: disable the console lock when in kgdb After commit `ddde3c18b7` ("vt: More locking checks") kdb / kgdb has become useless because my console is filled with spews of: WARNING: CPU: 0 PID: 0 at .../drivers/tty/vt/vt.c:3846 con_is_visible+0x50/0x74 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc1+ #48 Hardware name: Rockchip (Device Tree) Backtrace: [<c020ce9c>] (dump_backtrace) from [<c020d188>] (show_stack+0x20/0x24) [<c020d168>] (show_stack) from [<c0a8fc14>] (dump_stack+0xb0/0xd0) [<c0a8fb64>] (dump_stack) from [<c0232c58>] (__warn+0xec/0x11c) [<c0232b6c>] (__warn) from [<c0232dc4>] (warn_slowpath_null+0x4c/0x58) [<c0232d78>] (warn_slowpath_null) from [<c06338a0>] (con_is_visible+0x50/0x74) [<c0633850>] (con_is_visible) from [<c0634078>] (con_scroll+0x108/0x1ac) [<c0633f70>] (con_scroll) from [<c0634160>] (lf+0x44/0x88) [<c063411c>] (lf) from [<c06363ec>] (vt_console_print+0x1a4/0x2bc) [<c0636248>] (vt_console_print) from [<c02f628c>] (vkdb_printf+0x420/0x8a4) [<c02f5e6c>] (vkdb_printf) from [<c02f6754>] (kdb_printf+0x44/0x60) [<c02f6714>] (kdb_printf) from [<c02fa6f4>] (kdb_main_loop+0xf4/0x6e0) [<c02fa600>] (kdb_main_loop) from [<c02fd5f0>] (kdb_stub+0x268/0x398) [<c02fd388>] (kdb_stub) from [<c02f3ba0>] (kgdb_cpu_enter+0x1f8/0x674) [<c02f39a8>] (kgdb_cpu_enter) from [<c02f4330>] (kgdb_handle_exception+0x1c4/0x1fc) [<c02f416c>] (kgdb_handle_exception) from [<c0210fe0>] (kgdb_compiled_brk_fn+0x30/0x3c) [<c0210fb0>] (kgdb_compiled_brk_fn) from [<c020d7ac>] (do_undefinstr+0x180/0x1a0) [<c020d62c>] (do_undefinstr) from [<c0201b44>] (__und_svc_finish+0x0/0x3c) ... [<c02f3224>] (kgdb_breakpoint) from [<c02f3310>] (sysrq_handle_dbg+0x58/0x6c) [<c02f32b8>] (sysrq_handle_dbg) from [<c062abf0>] (__handle_sysrq+0xac/0x154) Let's disable this warning when we're in kgdb to avoid the spew. The whole system is stopped when we're in kgdb so we can't exactly wait for someone else to drop the lock. Presumably the best we can do is to disable the warning and hope for the best. Fixes: `ddde3c18b7` ("vt: More locking checks") Cc: Daniel Vetter <daniel.vetter@intel.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20190725183551.169208-1-dianders@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-07-30 17:39:39 +02:00
arch	SPDX fixes for 5.3-rc2	2019-07-28 10:00:06 -07:00
block	for-linus-20190726-2	2019-07-26 19:20:34 -07:00
certs	Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs"	2019-07-10 18:43:43 -07:00
crypto	USB / PHY patches for 5.3-rc1	2019-07-11 15:40:06 -07:00
Documentation	USB fixes for 5.3-rc2	2019-07-28 09:52:35 -07:00
drivers	kgdboc: disable the console lock when in kgdb	2019-07-30 17:39:39 +02:00
fs	SPDX fixes for 5.3-rc2	2019-07-28 10:00:06 -07:00
include	TTY fixes for 5.3-rc2	2019-07-28 10:18:33 -07:00
init	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
ipc	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
kernel	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-07-27 21:22:33 -07:00
lib	test_firmware: fix a memory leak bug	2019-07-25 14:39:52 +02:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()	2019-07-22 10:18:30 +02:00
net	tcp: be more careful in tcp_fragment()	2019-07-21 20:41:24 -07:00
samples	treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers again	2019-07-25 11:05:10 +02:00
scripts	Kbuild fixes for v5.3	2019-07-28 10:35:04 -07:00
security	meminit fix	2019-07-28 12:33:15 -07:00
sound	sound fixes for 5.3-rc2	2019-07-26 10:23:45 -07:00
tools	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-07-27 21:17:56 -07:00
usr	kbuild: enable arch/s390/include/uapi/asm/zcrypt.h for uapi header test	2019-07-23 10:45:46 +02:00
virt	Documentation: move Documentation/virtual to Documentation/virt	2019-07-24 10:52:11 +02:00
.clang-format	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	.gitignore: Add compilation database file	2019-07-27 12:18:19 +09:00
.mailmap	MAINTAINERS: Update my email address	2019-07-22 14:57:50 +01:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Remove references to dead website.	2019-07-19 12:22:04 -07:00
Kbuild	Kbuild updates for v5.1	2019-03-10 17:48:21 -07:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	Char/Misc driver fixes for 5.3-rc2	2019-07-28 10:26:10 -07:00
Makefile	Linux 5.3-rc2	2019-07-28 12:47:02 -07:00
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.