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authorDmitry Safonov <dima@arista.com>2020-06-08 21:30:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:10 -0700
commitee65ca01c62cd89cea6192017806b55c34f1cfda (patch)
tree084cc299912baa651b444cd586ad5969ffeb4948 /arch
parente8d7b7353216586f64f5bbcc024951e3cab10a60 (diff)
downloadlinux-ee65ca01c62cd89cea6192017806b55c34f1cfda.tar.bz2
arm: add loglvl to dump_backtrace()
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. Add log level argument to dump_backtrace() as a preparation for introducing show_stack_loglvl(). As a good side-effect __die() now prints not only "Stack:" header with KERN_EMERG, but the backtrace itself. [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/20200418201944.482088-7-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/traps.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index aef52a401ad5..014fb5ad3a8b 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -202,17 +202,19 @@ static void dump_instr(const char *lvl, struct pt_regs *regs)
}
#ifdef CONFIG_ARM_UNWIND
-static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
+ const char *loglvl)
{
- unwind_backtrace(regs, tsk, KERN_DEFAULT);
+ unwind_backtrace(regs, tsk, loglvl);
}
#else
-static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
+ const char *loglvl)
{
unsigned int fp, mode;
int ok = 1;
- printk("Backtrace: ");
+ printk("%sBacktrace: ", loglvl);
if (!tsk)
tsk = current;
@@ -239,13 +241,13 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
pr_cont("\n");
if (ok)
- c_backtrace(fp, mode, NULL);
+ c_backtrace(fp, mode, loglvl);
}
#endif
void show_stack(struct task_struct *tsk, unsigned long *sp)
{
- dump_backtrace(NULL, tsk);
+ dump_backtrace(NULL, tsk, KERN_DEFAULT);
barrier();
}
@@ -289,7 +291,7 @@ static int __die(const char *str, int err, struct pt_regs *regs)
if (!user_mode(regs) || in_interrupt()) {
dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,
THREAD_SIZE + (unsigned long)task_stack_page(tsk));
- dump_backtrace(regs, tsk);
+ dump_backtrace(regs, tsk, KERN_EMERG);
dump_instr(KERN_EMERG, regs);
}