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authorChuck Ebbert <76306.1226@compuserve.com>2006-12-07 02:14:11 +0100
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 02:14:11 +0100
commit0741f4d207a644482d7a040f05cd264c98cf7ee8 (patch)
tree787f2fffc12871d0f19e492fc4258cda254aa42d
parent[PATCH] x86-64: Fix comments for MSR_FS_BASE and MSR_GS_BASE. (diff)
downloadlinux-0741f4d207a644482d7a040f05cd264c98cf7ee8.tar.xz
linux-0741f4d207a644482d7a040f05cd264c98cf7ee8.zip
[PATCH] x86: add sysctl for kstack_depth_to_print
Add sysctl for kstack_depth_to_print. This lets users change the amount of raw stack data printed in dump_stack() without having to reboot. Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Andi Kleen <ak@suse.de>
-rw-r--r--Documentation/sysctl/kernel.txt8
-rw-r--r--arch/i386/kernel/traps.c2
-rw-r--r--arch/x86_64/kernel/traps.c2
-rw-r--r--include/asm-x86_64/stacktrace.h2
-rw-r--r--kernel/sysctl.c9
5 files changed, 21 insertions, 2 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 0bc7f1e3c9e6..5922e84d9133 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -27,6 +27,7 @@ show up in /proc/sys/kernel:
- hotplug
- java-appletviewer [ binfmt_java, obsolete ]
- java-interpreter [ binfmt_java, obsolete ]
+- kstack_depth_to_print [ X86 only ]
- l2cr [ PPC only ]
- modprobe ==> Documentation/kmod.txt
- msgmax
@@ -170,6 +171,13 @@ This flag controls the L2 cache of G3 processor boards. If
==============================================================
+kstack_depth_to_print: (X86 only)
+
+Controls the number of words to print when dumping the raw
+kernel stack.
+
+==============================================================
+
osrelease, ostype & version:
# cat osrelease
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 7b2f9f022089..1d48a75fa338 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -91,7 +91,7 @@ asmlinkage void alignment_check(void);
asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
-static int kstack_depth_to_print = 24;
+int kstack_depth_to_print = 24;
#ifdef CONFIG_STACK_UNWIND
static int call_trace = 1;
#else
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 264db33476ab..75ceccee178c 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -108,7 +108,7 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
preempt_enable_no_resched();
}
-static int kstack_depth_to_print = 12;
+int kstack_depth_to_print = 12;
#ifdef CONFIG_STACK_UNWIND
static int call_trace = 1;
#else
diff --git a/include/asm-x86_64/stacktrace.h b/include/asm-x86_64/stacktrace.h
index 5eb9799bef76..6f0b54594307 100644
--- a/include/asm-x86_64/stacktrace.h
+++ b/include/asm-x86_64/stacktrace.h
@@ -1,6 +1,8 @@
#ifndef _ASM_STACKTRACE_H
#define _ASM_STACKTRACE_H 1
+extern int kstack_depth_to_print;
+
/* Generic stack tracer with callbacks */
struct stacktrace_ops {
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 09e569f4792b..6fc5e17086f4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -54,6 +54,7 @@ extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
#ifdef CONFIG_X86
#include <asm/nmi.h>
+#include <asm/stacktrace.h>
#endif
#if defined(CONFIG_SYSCTL)
@@ -707,6 +708,14 @@ static ctl_table kern_table[] = {
.mode = 0444,
.proc_handler = &proc_dointvec,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "kstack_depth_to_print",
+ .data = &kstack_depth_to_print,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
#endif
#if defined(CONFIG_MMU)
{