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
..
hvc	docs: powerpc: convert docs to ReST and rename to *.rst	2019-07-17 06:57:51 -03:00
ipwireless
serdev
serial	kgdboc: disable the console lock when in kgdb	2019-07-30 17:39:39 +02:00
vt	vt: Grab console_lock around con_is_bound in show_bind	2019-07-25 13:47:35 +02:00
amiserial.c
cyclades.c
ehv_bytechan.c
goldfish.c
isicom.c
Kconfig	docs: serial: move it to the driver-api	2019-07-15 11:03:03 -03:00
Makefile
mips_ejtag_fdc.c
moxa.c
moxa.h
mxser.c
mxser.h
n_gsm.c
n_hdlc.c
n_null.c
n_r3964.c
n_tracerouter.c
n_tracesink.c
n_tracesink.h
n_tty.c
nozomi.c
pty.c
rocket_int.h
rocket.c	TTY/Serial patches for 5.2-rc1	2019-05-08 10:07:28 -07:00
rocket.h	tty: rocket: Remove RCPK_GET_STRUCT ioctl	2019-04-25 11:58:56 +02:00
synclink_gt.c
synclink.c
synclinkmp.c
sysrq.c	panic: avoid the extra noise dmesg	2019-05-14 19:52:51 -07:00
tty_audit.c
tty_baudrate.c
tty_buffer.c
tty_io.c	tty: tty_io: fix driver refcount imbalance on error path	2019-05-24 10:09:12 +02:00
tty_ioctl.c
tty_jobctrl.c
tty_ldisc.c	proc/sysctl: add shared variables for range check	2019-07-18 17:08:07 -07:00
tty_ldsem.c	tty/ldsem, locking/rwsem: Add missing ACQUIRE to read_failed sleep loop	2019-07-25 15:39:24 +02:00
tty_mutex.c
tty_port.c
ttynull.c
vcc.c