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authorDmitry Safonov <dima@arista.com>2020-06-08 21:31:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:12 -0700
commite6e371c4f653db7581072a0a20b32a11a751ebda (patch)
tree067ca348c305c8d822628488601a4988a0534ecf /arch
parent539e786cc37ee5cb6e051ef5eb72b7a7c03022cf (diff)
downloadlinux-e6e371c4f653db7581072a0a20b32a11a751ebda.tar.bz2
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/kernel/dumpstack.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/sh/kernel/dumpstack.c b/arch/sh/kernel/dumpstack.c
index d488a47a1f0f..cc51e9d74667 100644
--- a/arch/sh/kernel/dumpstack.c
+++ b/arch/sh/kernel/dumpstack.c
@@ -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);
}