The patch titled
lockdep: stacktrace subsystem, x86_64 support
has been removed from the -mm tree. Its filename is
lockdep-stacktrace-subsystem-x86_64-support.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: lockdep: stacktrace subsystem, x86_64 support
From: Ingo Molnar <mingo@xxxxxxx>
Framework to generate and save stacktraces quickly, without printing anything
to the console. x86_64 support.
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/x86_64/Kconfig | 4
arch/x86_64/kernel/Makefile | 1
arch/x86_64/kernel/stacktrace.c | 221 ++++++++++++++++++++++++++++++
3 files changed, 226 insertions(+)
diff -puN arch/x86_64/Kconfig~lockdep-stacktrace-subsystem-x86_64-support arch/x86_64/Kconfig
--- a/arch/x86_64/Kconfig~lockdep-stacktrace-subsystem-x86_64-support
+++ a/arch/x86_64/Kconfig
@@ -24,6 +24,10 @@ config X86
bool
default y
+config STACKTRACE_SUPPORT
+ bool
+ default y
+
config SEMAPHORE_SLEEPERS
bool
default y
diff -puN arch/x86_64/kernel/Makefile~lockdep-stacktrace-subsystem-x86_64-support arch/x86_64/kernel/Makefile
--- a/arch/x86_64/kernel/Makefile~lockdep-stacktrace-subsystem-x86_64-support
+++ a/arch/x86_64/kernel/Makefile
@@ -10,6 +10,7 @@ obj-y := process.o signal.o entry.o trap
setup64.o bootflag.o e820.o reboot.o quirks.o i8237.o \
pci-dma.o pci-nommu.o alternative.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_X86_MCE) += mce.o
obj-$(CONFIG_X86_MCE_INTEL) += mce_intel.o
obj-$(CONFIG_X86_MCE_AMD) += mce_amd.o
diff -puN /dev/null arch/x86_64/kernel/stacktrace.c
--- /dev/null
+++ a/arch/x86_64/kernel/stacktrace.c
@@ -0,0 +1,221 @@
+/*
+ * arch/x86_64/kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@xxxxxxxxxx>
+ */
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+
+#include <asm/smp.h>
+
+static inline int
+in_range(unsigned long start, unsigned long addr, unsigned long end)
+{
+ return addr >= start && addr <= end;
+}
+
+static unsigned long
+get_stack_end(struct task_struct *task, unsigned long stack)
+{
+ unsigned long stack_start, stack_end, flags;
+ int i, cpu;
+
+ /*
+ * The most common case is that we are in the task stack:
+ */
+ stack_start = (unsigned long)task->thread_info;
+ stack_end = stack_start + THREAD_SIZE;
+
+ if (in_range(stack_start, stack, stack_end))
+ return stack_end;
+
+ /*
+ * We are in an interrupt if irqstackptr is set:
+ */
+ raw_local_irq_save(flags);
+ cpu = safe_smp_processor_id();
+ stack_end = (unsigned long)cpu_pda(cpu)->irqstackptr;
+
+ if (stack_end) {
+ stack_start = stack_end & ~(IRQSTACKSIZE-1);
+ if (in_range(stack_start, stack, stack_end))
+ goto out_restore;
+ /*
+ * We get here if we are in an IRQ context but we
+ * are also in an exception stack.
+ */
+ }
+
+ /*
+ * Iterate over all exception stacks, and figure out whether
+ * 'stack' is in one of them:
+ */
+ for (i = 0; i < N_EXCEPTION_STACKS; i++) {
+ /*
+ * set 'end' to the end of the exception stack.
+ */
+ stack_end = per_cpu(init_tss, cpu).ist[i];
+ stack_start = stack_end - EXCEPTION_STKSZ;
+
+ /*
+ * Is 'stack' above this exception frame's end?
+ * If yes then skip to the next frame.
+ */
+ if (stack >= stack_end)
+ continue;
+ /*
+ * Is 'stack' above this exception frame's start address?
+ * If yes then we found the right frame.
+ */
+ if (stack >= stack_start)
+ goto out_restore;
+
+ /*
+ * If this is a debug stack, and if it has a larger size than
+ * the usual exception stacks, then 'stack' might still
+ * be within the lower portion of the debug stack:
+ */
+#if DEBUG_STKSZ > EXCEPTION_STKSZ
+ if (i == DEBUG_STACK - 1 && stack >= stack_end - DEBUG_STKSZ) {
+ /*
+ * Black magic. A large debug stack is composed of
+ * multiple exception stack entries, which we
+ * iterate through now. Dont look:
+ */
+ do {
+ stack_end -= EXCEPTION_STKSZ;
+ stack_start -= EXCEPTION_STKSZ;
+ } while (stack < stack_start);
+
+ goto out_restore;
+ }
+#endif
+ }
+ /*
+ * Ok, 'stack' is not pointing to any of the system stacks.
+ */
+ stack_end = 0;
+
+out_restore:
+ raw_local_irq_restore(flags);
+
+ return stack_end;
+}
+
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer:
+ */
+static inline unsigned long
+save_context_stack(struct stack_trace *trace, unsigned int skip,
+ unsigned long stack, unsigned long stack_end)
+{
+ unsigned long addr;
+
+#ifdef CONFIG_FRAME_POINTER
+ unsigned long prev_stack = 0;
+
+ while (in_range(prev_stack, stack, stack_end)) {
+ pr_debug("stack: %p\n", (void *)stack);
+ addr = (unsigned long)(((unsigned long *)stack)[1]);
+ pr_debug("addr: %p\n", (void *)addr);
+ if (!skip)
+ trace->entries[trace->nr_entries++] = addr-1;
+ else
+ skip--;
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ if (!addr)
+ return 0;
+ /*
+ * Stack frames must go forwards (otherwise a loop could
+ * happen if the stackframe is corrupted), so we move
+ * prev_stack forwards:
+ */
+ prev_stack = stack;
+ stack = (unsigned long)(((unsigned long *)stack)[0]);
+ }
+ pr_debug("invalid: %p\n", (void *)stack);
+#else
+ while (stack < stack_end) {
+ addr = ((unsigned long *)stack)[0];
+ stack += sizeof(long);
+ if (__kernel_text_address(addr)) {
+ if (!skip)
+ trace->entries[trace->nr_entries++] = addr-1;
+ else
+ skip--;
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ }
+ }
+#endif
+ return stack;
+}
+
+#define MAX_STACKS 10
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ * If all_contexts is set, all contexts (hardirq, softirq and process)
+ * are saved. If not set then only the current context is saved.
+ */
+void save_stack_trace(struct stack_trace *trace,
+ struct task_struct *task, int all_contexts,
+ unsigned int skip)
+{
+ unsigned long stack = (unsigned long)&stack;
+ int i, nr_stacks = 0, stacks_done[MAX_STACKS];
+
+ WARN_ON(trace->nr_entries || !trace->max_entries);
+
+ if (!task)
+ task = current;
+
+ pr_debug("task: %p, ti: %p\n", task, task->thread_info);
+
+ if (!task || task == current) {
+ /* Grab rbp right from our regs: */
+ asm ("mov %%rbp, %0" : "=r" (stack));
+ pr_debug("rbp: %p\n", (void *)stack);
+ } else {
+ /* rbp is the last reg pushed by switch_to(): */
+ stack = task->thread.rsp;
+ pr_debug("other task rsp: %p\n", (void *)stack);
+ stack = (unsigned long)(((unsigned long *)stack)[0]);
+ pr_debug("other task rbp: %p\n", (void *)stack);
+ }
+
+ while (1) {
+ unsigned long stack_end = get_stack_end(task, stack);
+
+ pr_debug("stack: %p\n", (void *)stack);
+ pr_debug("stack end: %p\n", (void *)stack_end);
+
+ /*
+ * Invalid stack addres?
+ */
+ if (!stack_end)
+ return;
+ /*
+ * Were we in this stack already? (recursion)
+ */
+ for (i = 0; i < nr_stacks; i++)
+ if (stacks_done[i] == stack_end)
+ return;
+ stacks_done[nr_stacks] = stack_end;
+
+ stack = save_context_stack(trace, skip, stack, stack_end);
+ if (!all_contexts || !stack ||
+ trace->nr_entries >= trace->max_entries)
+ return;
+ trace->entries[trace->nr_entries++] = ULONG_MAX;
+ if (trace->nr_entries >= trace->max_entries)
+ return;
+ if (++nr_stacks >= MAX_STACKS)
+ return;
+ }
+}
+
_
Patches currently in -mm which might be from mingo@xxxxxxx are
origin.patch
disable-debugging-version-of-write_lock.patch
lock-validator-fix-ns83820c-irq-flags-bug.patch
revert-gregkh-pci-pci-test-that-drivers-properly-call-pci_set_master.patch
my-name-is-ingo-molnar-you-killed-my-make-allyesconfig-prepare-to-die.patch
sched-fix-bug-in-__migrate_task.patch
small-kernel-schedc-cleanup.patch
x86-re-enable-generic-numa.patch
sched-add-above-background-load-function.patch
mm-implement-swap-prefetching.patch
sched-cleanup-remove-task_t-convert-to-struct-task_struct-prefetch.patch
genirq-convert-the-x86_64-architecture-to-irq-chips.patch
genirq-convert-the-i386-architecture-to-irq-chips.patch
genirq-irq-convert-the-move_irq-flag-from-a-32bit-word-to-a-single-bit.patch
genirq-irq-add-moved_masked_irq.patch
genirq-x86_64-irq-reenable-migrating-irqs-to-other-cpus.patch
genirq-msi-simplify-msi-enable-and-disable.patch
genirq-msi-make-the-msi-boolean-tests-return-either-0-or-1.patch
genirq-msi-implement-helper-functions-read_msi_msg-and-write_msi_msg.patch
genirq-msi-refactor-the-msi_ops.patch
genirq-msi-simplify-the-msi-irq-limit-policy.patch
genirq-irq-add-a-dynamic-irq-creation-api.patch
genirq-ia64-irq-dynamic-irq-support.patch
genirq-i386-irq-dynamic-irq-support.patch
genirq-x86_64-irq-dynamic-irq-support.patch
genirq-msi-make-the-msi-code-irq-based-and-not-vector-based.patch
genirq-x86_64-irq-move-msi-message-composition-into-io_apicc.patch
genirq-i386-irq-move-msi-message-composition-into-io_apicc.patch
genirq-msi-only-build-msi-apicc-on-ia64.patch
genirq-x86_64-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-irq-remove-msi-hacks.patch
genirq-irq-generalize-the-check-for-hardirq_bits.patch
genirq-x86_64-irq-make-the-external-irq-handlers-report-their-vector-not-the-irq-number.patch
genirq-x86_64-irq-make-vector_irq-per-cpu.patch
genirq-x86_64-irq-kill-gsi_irq_sharing.patch
genirq-x86_64-irq-kill-irq-compression.patch
detect-atomic-counter-underflows.patch
debug-shared-irqs.patch
make-frame_pointer-default=y.patch
mutex-subsystem-synchro-test-module.patch
vdso-print-fatal-signals.patch
vdso-improve-print_fatal_signals-support-by-adding-memory-maps.patch
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