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parisc: 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: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Link: http://lkml.kernel.org/r/20200418201944.482088-26-dima@arista.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Safonov 2020-06-08 21:31:11 -07:00 committed by Linus Torvalds
parent 0633032f08
commit 3481d31bf7
1 changed files with 17 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/parisc/kernel/traps.c
View File

@ -49,7 +49,7 @@
#include "../math-emu/math-emu.h" /* for handle_fpe() */
static void parisc_show_stack(struct task_struct *task,
struct pt_regs *regs);
struct pt_regs *regs, const char *loglvl);
static int printbinary(char *buf, unsigned long x, int nbits)
{
@ -155,7 +155,7 @@ void show_regs(struct pt_regs *regs)
printk("%s IAOQ[1]: %pS\n", level, (void *) regs->iaoq[1]);
printk("%s RP(r2): %pS\n", level, (void *) regs->gr[2]);
parisc_show_stack(current, regs);
parisc_show_stack(current, regs, KERN_DEFAULT);
}
}
@ -170,37 +170,43 @@ static DEFINE_RATELIMIT_STATE(_hppa_rs,
}
static void do_show_stack(struct unwind_frame_info *info)
static void do_show_stack(struct unwind_frame_info *info, const char *loglvl)
{
int i = 1;
printk(KERN_CRIT "Backtrace:\n");
printk("%sBacktrace:\n", loglvl);
while (i <= MAX_UNWIND_ENTRIES) {
if (unwind_once(info) < 0 || info->ip == 0)
break;
if (__kernel_text_address(info->ip)) {
printk(KERN_CRIT " [<" RFMT ">] %pS\n",
info->ip, (void *) info->ip);
printk("%s [<" RFMT ">] %pS\n",
loglvl, info->ip, (void *) info->ip);
i++;
}
}
printk(KERN_CRIT "\n");
printk("%s\n", loglvl);
}
static void parisc_show_stack(struct task_struct *task,
struct pt_regs *regs)
struct pt_regs *regs, const char *loglvl)
{
struct unwind_frame_info info;
unwind_frame_init_task(&info, task, regs);
do_show_stack(&info);
do_show_stack(&info, loglvl);
}
void show_stack_loglvl(struct task_struct *t, unsigned long *sp,
const char *loglvl)
{
parisc_show_stack(t, NULL, loglvl);
}
void show_stack(struct task_struct *t, unsigned long *sp)
{
parisc_show_stack(t, NULL);
show_stack_loglvl(t, sp, KERN_CRIT)
}
int is_valid_bugaddr(unsigned long iaoq)
@ -446,7 +452,7 @@ void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long o
/* show_stack(NULL, (unsigned long *)regs->gr[30]); */
struct unwind_frame_info info;
unwind_frame_init(&info, current, regs);
do_show_stack(&info);
do_show_stack(&info, KERN_CRIT);
}
printk("\n");