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authorDmitry Safonov <dima@arista.com>2020-06-08 21:30:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:10 -0700
commita4502d04c7dd075846bb70ebfde3843f9df86f98 (patch)
tree8b046b5c8a1fced5be5cfac25492bc21dea13836
parent34135eacae6497d9c7bfca450f6c33e5245c92d2 (diff)
downloadlinux-stericsson-a4502d04c7dd075846bb70ebfde3843f9df86f98.tar.gz
arm: 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: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will@kernel.org> Link: http://lkml.kernel.org/r/20200418201944.482088-9-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/arm/kernel/traps.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 0aa55dc025a1..2ae2c23799ad 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -247,12 +247,18 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
}
#endif
-void show_stack(struct task_struct *tsk, unsigned long *sp)
+void show_stack_loglvl(struct task_struct *tsk, unsigned long *sp,
+ const char *loglvl)
{
- dump_backtrace(NULL, tsk, KERN_DEFAULT);
+ dump_backtrace(NULL, tsk, loglvl);
barrier();
}
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+ show_stack_loglvl(tsk, sp, KERN_DEFAULT);
+}
+
#ifdef CONFIG_PREEMPT
#define S_PREEMPT " PREEMPT"
#elif defined(CONFIG_PREEMPT_RT)