[PATCH] namespaces: utsname: use init_utsname when appropriate

[pandora-kernel.git] / kernel / lockdep.c

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 9bad178..4c05534 100644 (file)
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -36,6 +36,7 @@
 #include <linux/stacktrace.h>
 #include <linux/debug_locks.h>
 #include <linux/irqflags.h>
+#include <linux/utsname.h>
 
 #include <asm/sections.h>
 
@@ -121,8 +122,8 @@ static struct list_head chainhash_table[CHAINHASH_SIZE];
  * unique.
  */
 #define iterate_chain_key(key1, key2) \
-       (((key1) << MAX_LOCKDEP_KEYS_BITS/2) ^ \
-       ((key1) >> (64-MAX_LOCKDEP_KEYS_BITS/2)) ^ \
+       (((key1) << MAX_LOCKDEP_KEYS_BITS) ^ \
+       ((key1) >> (64-MAX_LOCKDEP_KEYS_BITS)) ^ \
        (key2))
 
 void lockdep_off(void)
@@ -224,7 +225,14 @@ static int save_trace(struct stack_trace *trace)
        trace->max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries;
        trace->entries = stack_trace + nr_stack_trace_entries;
 
-       save_stack_trace(trace, NULL, 0, 3);
+       trace->skip = 3;
+       trace->all_contexts = 0;
+
+       /* Make sure to not recurse in case the the unwinder needs to tak
+e         locks. */
+       lockdep_off();
+       save_stack_trace(trace, NULL);
+       lockdep_on();
 
        trace->max_entries = trace->nr_entries;
 
@@ -508,6 +516,13 @@ print_circular_bug_entry(struct lock_list *target, unsigned int depth)
        return 0;
 }
 
+static void print_kernel_version(void)
+{
+       printk("%s %.*s\n", init_utsname()->release,
+               (int)strcspn(init_utsname()->version, " "),
+               init_utsname()->version);
+}
+
 /*
  * When a circular dependency is detected, print the
  * header first:
@@ -524,6 +539,7 @@ print_circular_bug_header(struct lock_list *entry, unsigned int depth)
 
        printk("\n=======================================================\n");
        printk(  "[ INFO: possible circular locking dependency detected ]\n");
+       print_kernel_version();
        printk(  "-------------------------------------------------------\n");
        printk("%s/%d is trying to acquire lock:\n",
                curr->comm, curr->pid);
@@ -705,6 +721,7 @@ print_bad_irq_dependency(struct task_struct *curr,
        printk("\n======================================================\n");
        printk(  "[ INFO: %s-safe -> %s-unsafe lock order detected ]\n",
                irqclass, irqclass);
+       print_kernel_version();
        printk(  "------------------------------------------------------\n");
        printk("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
                curr->comm, curr->pid,
@@ -786,6 +803,7 @@ print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
 
        printk("\n=============================================\n");
        printk(  "[ INFO: possible recursive locking detected ]\n");
+       print_kernel_version();
        printk(  "---------------------------------------------\n");
        printk("%s/%d is trying to acquire lock:\n",
                curr->comm, curr->pid);
@@ -1368,6 +1386,7 @@ print_irq_inversion_bug(struct task_struct *curr, struct lock_class *other,
 
        printk("\n=========================================================\n");
        printk(  "[ INFO: possible irq lock inversion dependency detected ]\n");
+       print_kernel_version();
        printk(  "---------------------------------------------------------\n");
        printk("%s/%d just changed the state of lock:\n",
                curr->comm, curr->pid);
@@ -1462,6 +1481,7 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
 
        printk("\n=================================\n");
        printk(  "[ INFO: inconsistent lock state ]\n");
+       print_kernel_version();
        printk(  "---------------------------------\n");
 
        printk("inconsistent {%s} -> {%s} usage.\n",