microblaze: add loglvl to microblaze_unwind()
authorDmitry Safonov <dima@arista.com>
Tue, 9 Jun 2020 04:30:53 +0000 (21:30 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 9 Jun 2020 16:39:11 +0000 (09:39 -0700)
commit14b0dd870f6f3b28fad1235b70d1a692db1d6a2f
tree5f53be8788d996c8e5abc7c84b8bf5a95be03641
parent77530a5277bcab0433d0f68af11e04a5c4d79039
microblaze: add loglvl to microblaze_unwind()

Currently, the log-level of show_stack() depends on a platform
realization.  It creates situations where the headers are printed with
lower log level or higher than the stacktrace (depending on a platform or
user).

Furthermore, it forces the logic decision from user to an architecture
side.  In result, some users as sysrq/kdb/etc are doing tricks with
temporary rising console_loglevel while printing their messages.  And in
result it not only may print unwanted messages from other CPUs, but also
omit printing at all in the unlucky case where the printk() was deferred.

Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier
approach than introducing more printk buffers.  Also, it will consolidate
printings with headers.

Add log level parameter to microblaze_unwind() as a preparation to add
show_stack_loglvl().

[1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u

Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Simek <monstr@monstr.eu>
Link: http://lkml.kernel.org/r/20200418201944.482088-20-dima@arista.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/microblaze/include/asm/unwind.h
arch/microblaze/kernel/stacktrace.c
arch/microblaze/kernel/traps.c
arch/microblaze/kernel/unwind.c