microblaze: add show_stack_loglvl()
authorDmitry Safonov <dima@arista.com>
Tue, 9 Jun 2020 04:30:56 +0000 (21:30 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 9 Jun 2020 16:39:11 +0000 (09:39 -0700)
commit35f3968b499c6dd026a828933b57ebdb11e74cff
tree926ec572317f6d7edea1d0ea46bc369e70fee6bd
parent14b0dd870f6f3b28fad1235b70d1a692db1d6a2f
microblaze: add show_stack_loglvl()

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.

Introduce show_stack_loglvl(), that eventually will substitute
show_stack().

[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/20200418201944.482088-21-dima@arista.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/microblaze/kernel/traps.c