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authorDmitry Safonov <dima@arista.com>2020-06-08 21:31:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:12 -0700
commitebf0a36a32b25fe6ba8a1b6bd3135432ebd9aa5c (patch)
tree41789a8beb8caec8299dad419a8a7db045c77f30
parent8539c1288ddc23eef0fe71e1bcecc04b3fc6a9ee (diff)
downloadlinux-stericsson-ebf0a36a32b25fe6ba8a1b6bd3135432ebd9aa5c.tar.gz
sh: add loglvl to dump_mem()
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_mem() as a preparation to introduce show_stack_loglvl(). [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/20200418201944.482088-30-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/sh/include/asm/kdebug.h3
-rw-r--r--arch/sh/kernel/dumpstack.c17
-rw-r--r--arch/sh/kernel/traps.c4
3 files changed, 13 insertions, 11 deletions
diff --git a/arch/sh/include/asm/kdebug.h b/arch/sh/include/asm/kdebug.h
index 5212f5fcd752..de8693fabb1d 100644
--- a/arch/sh/include/asm/kdebug.h
+++ b/arch/sh/include/asm/kdebug.h
@@ -13,6 +13,7 @@ enum die_val {
/* arch/sh/kernel/dumpstack.c */
extern void printk_address(unsigned long address, int reliable);
-extern void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+extern void dump_mem(const char *str, const char *loglvl,
+ unsigned long bottom, unsigned long top);
#endif /* __ASM_SH_KDEBUG_H */
diff --git a/arch/sh/kernel/dumpstack.c b/arch/sh/kernel/dumpstack.c
index 9f1c9c11d62d..6784b914fba0 100644
--- a/arch/sh/kernel/dumpstack.c
+++ b/arch/sh/kernel/dumpstack.c
@@ -16,30 +16,31 @@
#include <asm/unwinder.h>
#include <asm/stacktrace.h>
-void dump_mem(const char *str, unsigned long bottom, unsigned long top)
+void dump_mem(const char *str, const char *loglvl,
+ unsigned long bottom, unsigned long top)
{
unsigned long p;
int i;
- printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
+ printk("%s%s(0x%08lx to 0x%08lx)\n", loglvl, str, bottom, top);
for (p = bottom & ~31; p < top; ) {
- printk("%04lx: ", p & 0xffff);
+ printk("%s%04lx: ", loglvl, p & 0xffff);
for (i = 0; i < 8; i++, p += 4) {
unsigned int val;
if (p < bottom || p >= top)
- printk(" ");
+ printk("%s ", loglvl);
else {
if (__get_user(val, (unsigned int __user *)p)) {
- printk("\n");
+ printk("%s\n", loglvl);
return;
}
- printk("%08x ", val);
+ printk("%s%08x ", loglvl, val);
}
}
- printk("\n");
+ printk("%s\n", loglvl);
}
}
@@ -156,7 +157,7 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
sp = (unsigned long *)tsk->thread.sp;
stack = (unsigned long)sp;
- dump_mem("Stack: ", stack, THREAD_SIZE +
+ dump_mem("Stack: ", KERN_DEFAULT, stack, THREAD_SIZE +
(unsigned long)task_stack_page(tsk));
show_trace(tsk, sp, NULL);
}
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index 2130381c9d57..a33025451fcd 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -38,8 +38,8 @@ void die(const char *str, struct pt_regs *regs, long err)
task_pid_nr(current), task_stack_page(current) + 1);
if (!user_mode(regs) || in_interrupt())
- dump_mem("Stack: ", regs->regs[15], THREAD_SIZE +
- (unsigned long)task_stack_page(current));
+ dump_mem("Stack: ", KERN_DEFAULT, regs->regs[15],
+ THREAD_SIZE + (unsigned long)task_stack_page(current));
notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV);