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Filename Latest commit message Latest commit date
Douglas Anderson 1343e0a859 kgdb: Disable WARN_CONSOLE_UNLOCKED for all kgdb 
[ Upstream commit 202164fbfa2b2ffa3e66b504e0f126ba9a745006 ]

In commit 81eaadcae8 ("kgdboc: disable the console lock when in
kgdb") we avoided the WARN_CONSOLE_UNLOCKED() yell when we were in
kgdboc.  That still works fine, but it turns out that we get a similar
yell when using other I/O drivers.  One example is the "I/O driver"
for the kgdb test suite (kgdbts).  When I enabled that I again got the
same yells.

Even though "kgdbts" doesn't actually interact with the user over the
console, using it still causes kgdb to print to the consoles.  That
trips the same warning:
  con_is_visible+0x60/0x68
  con_scroll+0x110/0x1b8
  lf+0x4c/0xc8
  vt_console_print+0x1b8/0x348
  vkdb_printf+0x320/0x89c
  kdb_printf+0x68/0x90
  kdb_main_loop+0x190/0x860
  kdb_stub+0x2cc/0x3ec
  kgdb_cpu_enter+0x268/0x744
  kgdb_handle_exception+0x1a4/0x200
  kgdb_compiled_brk_fn+0x34/0x44
  brk_handler+0x7c/0xb8
  do_debug_exception+0x1b4/0x228

Let's increment/decrement the "ignore_console_lock_warning" variable
all the time when we enter the debugger.

This will allow us to later revert commit 81eaadcae8 ("kgdboc:
disable the console lock when in kgdb").

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20200507130644.v4.1.Ied2b058357152ebcc8bf68edd6f20a11d98d7d4e@changeid
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-06-22 09:30:54 +02:00
arch MIPS: Loongson: Build ATI Radeon GPU driver as module 2020-06-22 09:30:54 +02:00
block block: reset mapping if failed to update hardware queue count 2020-06-22 09:30:53 +02:00
certs
crypto crypto: drbg - fix error return code in drbg_alloc_state() 2020-06-17 16:40:31 +02:00
Documentation lib/lzo: fix ambiguous encoding bug in lzo-rle 2020-06-17 16:40:28 +02:00
drivers platform/x86: dell-laptop: don't register micmute LED if there is no token 2020-06-22 09:30:53 +02:00
fs fat: don't allow to mount if the FAT length == 0 2020-06-17 16:40:36 +02:00
include dccp: Fix possible memleak in dccp_init and dccp_fini 2020-06-17 16:40:32 +02:00
init x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:20:34 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
kernel kgdb: Disable WARN_CONSOLE_UNLOCKED for all kgdb 2020-06-22 09:30:54 +02:00
lib lib/lzo: fix ambiguous encoding bug in lzo-rle 2020-06-17 16:40:28 +02:00
LICENSES
mm mm/slub: fix a memory leak in sysfs_slab_add() 2020-06-17 16:40:36 +02:00
net Bluetooth: Add SCO fallback for invalid LMP parameters error 2020-06-22 09:30:54 +02:00
samples samples: bpf: Fix build error 2020-06-03 08:21:15 +02:00
scripts bpf: Support llvm-objcopy for vmlinux BTF 2020-06-17 16:40:20 +02:00
security lockdown: Allow unprivileged users to see lockdown status 2020-06-22 09:30:53 +02:00
sound ALSA: usb-audio: Add vendor, product and profile name for HP Thunderbolt Dock 2020-06-17 16:40:28 +02:00
tools libbpf: Fix memory leak and possible double-free in hashmap__clear 2020-06-22 09:30:51 +02:00
usr
virt KVM: arm64: Save the host's PtrAuth keys in non-preemptible context 2020-06-17 16:40:38 +02:00
.clang-format
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MAINTAINERS
Makefile Linux 5.4.47 2020-06-17 16:40:38 +02:00
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.