]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
powerpc: add show_stack_loglvl()
authorDmitry Safonov <dima@arista.com>
Tue, 9 Jun 2020 04:31:14 +0000 (21:31 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 9 Jun 2020 16:39:11 +0000 (09:39 -0700)
commitb9677a8cf60995acdd1b36ff59e6b437154bff9e
tree6584aadf9c75f733d186041874ff23406dacc4f2
parent3481d31bf7473ced5a39fbfd2786b141798b6764
powerpc: 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>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Link: http://lkml.kernel.org/r/20200418201944.482088-27-dima@arista.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/powerpc/kernel/process.c