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SubjectPatch: ARM show_trace_task and show_task cleanup
Linus,

(CC:'d to lkml in case someone wants to object to the show_task() cleanup;
Alan has accepted it many -ac versions ago into his tree, and is happy for
me to send it on).

The following patch adds ARM support for show_trace_task() and changes
die() to display the instruction trace as ksymoops expects it (code
line last).

In addition, it cleans up show_task so that the displayed data is aligned
with the header that show_state displays:

1. We have some kernel tasks with more than 8 characters in their name.
2. Lazy-TLB state is shown at the end of each line, not in the middle of
the PID lists.

diff -urN linux-orig/arch/arm/kernel/traps.c linux/arch/arm/kernel/traps.c
--- linux-orig/arch/arm/kernel/traps.c Thu Feb 22 11:24:58 2001
+++ linux/arch/arm/kernel/traps.c Thu Jun 21 11:54:53 2001
@@ -20,6 +20,7 @@
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/ptrace.h>
+#include <linux/elf.h>
#include <linux/init.h>

#include <asm/atomic.h>
@@ -27,6 +28,7 @@
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/uaccess.h>
+#include <asm/unistd.h>

#include "ptrace.h"

@@ -143,6 +145,18 @@
c_backtrace(fp, processor_mode(regs));
}

+/*
+ * This is called from SysRq-T (show_task) to display the current
+ * call trace for each process. Very useful.
+ */
+void show_trace_task(struct task_struct *tsk)
+{
+ if (tsk != current) {
+ unsigned int fp = tsk->thread.save->fp;
+ c_backtrace(fp, 0x10);
+ }
+}
+
spinlock_t die_lock = SPIN_LOCK_UNLOCKED;

/*
@@ -173,9 +187,9 @@
fs = get_fs();
set_fs(KERNEL_DS);

- dump_instr(regs);
dump_stack(tsk, (unsigned long)(regs + 1));
dump_backtrace(regs, tsk);
+ dump_instr(regs);

set_fs(fs);
}
diff -urN linux-orig/kernel/sched.c linux/kernel/sched.c
--- linux-orig/kernel/sched.c Sun May 20 15:09:47 2001
+++ linux/kernel/sched.c Sun Jun 10 19:58:42 2001
@@ -1104,7 +1104,7 @@
int state;
static const char * stat_nam[] = { "R", "S", "D", "Z", "T", "W" };

- printk("%-8s ", p->comm);
+ printk("%-13.13s ", p->comm);
state = p->state ? ffz(~p->state) + 1 : 0;
if (((unsigned) state) < sizeof(stat_nam)/sizeof(char *))
printk(stat_nam[state]);
@@ -1132,20 +1132,20 @@
printk("%5d ", p->p_cptr->pid);
else
printk(" ");
- if (!p->mm)
- printk(" (L-TLB) ");
- else
- printk(" (NOTLB) ");
if (p->p_ysptr)
printk("%7d", p->p_ysptr->pid);
else
printk(" ");
if (p->p_osptr)
- printk(" %5d\n", p->p_osptr->pid);
+ printk(" %5d", p->p_osptr->pid);
+ else
+ printk(" ");
+ if (!p->mm)
+ printk(" (L-TLB)\n");
else
- printk("\n");
+ printk(" (NOTLB)\n");

-#if defined(CONFIG_X86) || defined(CONFIG_SPARC64)
+#if defined(CONFIG_X86) || defined(CONFIG_SPARC64) || defined(CONFIG_ARM)
/* This is very useful, but only works on x86 and sparc64 right now */
{
extern void show_trace_task(struct task_struct *tsk);


--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html

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