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sh: 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: Rich Felker <dalias@libc.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200418201944.482088-34-dima@arista.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Safonov 2020-06-08 21:31:36 -07:00 committed by Linus Torvalds
parent 539e786cc3
commit e6e371c4f6
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/sh/kernel/dumpstack.c
View File

@ -144,7 +144,8 @@ void show_trace(struct task_struct *tsk, unsigned long *sp,
debug_show_held_locks(tsk);
}
void show_stack(struct task_struct *tsk, unsigned long *sp)
void show_stack_loglvl(struct task_struct *tsk, unsigned long *sp,
const char *loglvl)
{
unsigned long stack;
@ -156,7 +157,12 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
sp = (unsigned long *)tsk->thread.sp;
stack = (unsigned long)sp;
dump_mem("Stack: ", KERN_DEFAULT, stack, THREAD_SIZE +
dump_mem("Stack: ", loglvl, stack, THREAD_SIZE +
(unsigned long)task_stack_page(tsk));
show_trace(tsk, sp, NULL, KERN_DEFAULT);
show_trace(tsk, sp, NULL, loglvl);
}
void show_stack(struct task_struct *task, unsigned long *sp)
{
show_stack_loglvl(task, sp, KERN_DEFAULT);
}