[PATCH] Consolidate bust_spinlocks()

Part of long forgotten patch
http://groups.google.com/group/fa.linux.kernel/msg/e98e941ce1cf29f6?dmode=source
Since then, m32r grabbed two copies.

Leave s390 copy because of important absence of CONFIG_VT, but remove
references to non-existent timerlist_lock.  ia64 also loses timerlist_lock.

Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 5 insertions, 135 deletions

diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index aaaa4d225f7e..cba9b3894a33 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -60,32 +60,6 @@ static inline int notify_page_fault(enum die_val val, const char *str,
 }
 
 /*
- * Unlock any spinlocks which will prevent us from getting the
- * message out 
- */
-void bust_spinlocks(int yes)
-{
-        int loglevel_save = console_loglevel;
-
-        if (yes) {
-                oops_in_progress = 1;
-                return;
-        }
-#ifdef CONFIG_VT
-        unblank_screen();
-#endif
-        oops_in_progress = 0;
-        /*
-         * OK, the message is on the console.  Now we call printk()
-         * without oops_in_progress set so that printk will give klogd
-         * a poke.  Hold onto your hats...
-         */
-        console_loglevel = 15;          /* NMI oopser may have shut the console up */
-        printk(" ");
-        console_loglevel = loglevel_save;
-}
-
-/*
  * Return EIP plus the CS segment base.  The segment limit is also
  * adjusted, clamped to the kernel/user address space (whichever is
  * appropriate), and returned in *eip_limit.
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index ab684747036f..765cbe5ba6ae 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -24,8 +24,6 @@
 #include <asm/uaccess.h>
 #include <asm/kdebug.h>
 
-extern spinlock_t timerlist_lock;
-
 fpswa_interface_t *fpswa_interface;
 EXPORT_SYMBOL(fpswa_interface);
 
@@ -53,34 +51,6 @@ trap_init (void)
                 fpswa_interface = __va(ia64_boot_param->fpswa);
 }
 
-/*
- * Unlock any spinlocks which will prevent us from getting the message out (timerlist_lock
- * is acquired through the console unblank code)
- */
-void
-bust_spinlocks (int yes)
-{
-        int loglevel_save = console_loglevel;
-
-        if (yes) {
-                oops_in_progress = 1;
-                return;
-        }
-
-#ifdef CONFIG_VT
-        unblank_screen();
-#endif
-        oops_in_progress = 0;
-        /*
-         * OK, the message is on the console.  Now we call printk() without
-         * oops_in_progress set so that printk will give klogd a poke.  Hold onto
-         * your hats...
-         */
-        console_loglevel = 15;          /* NMI oopser may have shut the console up */
-        printk(" ");
-        console_loglevel = loglevel_save;
-}
-
 void
 die (const char *str, struct pt_regs *regs, long err)
 {
diff --git a/arch/m32r/mm/fault-nommu.c b/arch/m32r/mm/fault-nommu.c
index 0a09cc01212b..9880abac3f54 100644
--- a/arch/m32r/mm/fault-nommu.c
+++ b/arch/m32r/mm/fault-nommu.c
@@ -44,32 +44,6 @@ unsigned int tlb_entry_d_dat[NR_CPUS];
 #define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
 #endif
 
-/*
- * Unlock any spinlocks which will prevent us from getting the
- * message out
- */
-void bust_spinlocks(int yes)
-{
-        int loglevel_save = console_loglevel;
-
-        if (yes) {
-                oops_in_progress = 1;
-                return;
-        }
-#ifdef CONFIG_VT
-        unblank_screen();
-#endif
-        oops_in_progress = 0;
-        /*
-         * OK, the message is on the console.  Now we call printk()
-         * without oops_in_progress set so that printk will give klogd
-         * a poke.  Hold onto your hats...
-         */
-        console_loglevel = 15;  /* NMI oopser may have shut the console up */
-        printk(" ");
-        console_loglevel = loglevel_save;
-}
-
 void do_BUG(const char *file, int line)
 {
         bust_spinlocks(1);
diff --git a/arch/m32r/mm/fault.c b/arch/m32r/mm/fault.c
index fc7ccdf829e2..037d58e82fb5 100644
--- a/arch/m32r/mm/fault.c
+++ b/arch/m32r/mm/fault.c
@@ -49,32 +49,6 @@ unsigned int tlb_entry_d_dat[NR_CPUS];
 
 extern void init_tlb(void);
 
-/*
- * Unlock any spinlocks which will prevent us from getting the
- * message out
- */
-void bust_spinlocks(int yes)
-{
-        int loglevel_save = console_loglevel;
-
-        if (yes) {
-                oops_in_progress = 1;
-                return;
-        }
-#ifdef CONFIG_VT
-        unblank_screen();
-#endif
-        oops_in_progress = 0;
-        /*
-         * OK, the message is on the console.  Now we call printk()
-         * without oops_in_progress set so that printk will give klogd
-         * a poke.  Hold onto your hats...
-         */
-        console_loglevel = 15;          /* NMI oopser may have shut the console up */
-        printk(" ");
-        console_loglevel = loglevel_save;
-}
-
 /*======================================================================*
  * do_page_fault()
  *======================================================================*
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 9ff143e87746..641aef36ccc4 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -83,12 +83,10 @@ static inline int notify_page_fault(enum die_val val, const char *str,
 }
 #endif
 
-extern spinlock_t timerlist_lock;
 
 /*
  * Unlock any spinlocks which will prevent us from getting the
- * message out (timerlist_lock is acquired through the
- * console unblank code)
+ * message out.
  */
 void bust_spinlocks(int yes)
 {
diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
index a65fc6f1dcaf..49e8cf2e06f8 100644
--- a/arch/x86_64/mm/fault.c
+++ b/arch/x86_64/mm/fault.c
@@ -69,27 +69,6 @@ static inline int notify_page_fault(enum die_val val, const char *str,
         return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
 }
 
-void bust_spinlocks(int yes)
-{
-        int loglevel_save = console_loglevel;
-        if (yes) {
-                oops_in_progress = 1;
-        } else {
-#ifdef CONFIG_VT
-                unblank_screen();
-#endif
-                oops_in_progress = 0;
-                /*
-                 * OK, the message is on the console.  Now we call printk()
-                 * without oops_in_progress set so that printk will give klogd
-                 * a poke.  Hold onto your hats...
-                 */
-                console_loglevel = 15;          /* NMI oopser may have shut the console up */
-                printk(" ");
-                console_loglevel = loglevel_save;
-        }
-}
-
 /* Sometimes the CPU reports invalid exceptions on prefetch.
    Check that here and ignore.
    Opcode checker based on code by Richard Brunner */
diff --git a/lib/Makefile b/lib/Makefile
index 3b605da448f4..b819e37440db 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -3,7 +3,7 @@
 #
 
 lib-y := ctype.o string.o vsprintf.o cmdline.o \
-         bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o \
+         rbtree.o radix-tree.o dump_stack.o \
          idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
          sha1.o irq_regs.o reciprocal_div.o
 
@@ -12,7 +12,8 @@ lib-$(CONFIG_SMP) += cpumask.o
 
 lib-y   += kobject.o kref.o kobject_uevent.o klist.o
 
-obj-y += sort.o parser.o halfmd4.o debug_locks.o random32.o iomap.o
+obj-y += sort.o parser.o halfmd4.o debug_locks.o random32.o iomap.o \
+        bust_spinlocks.o
 
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/bust_spinlocks.c b/lib/bust_spinlocks.c
index a2055bc3ef62..0ee968e8e023 100644
--- a/lib/bust_spinlocks.c
+++ b/lib/bust_spinlocks.c
@@ -14,7 +14,7 @@
 #include <linux/vt_kern.h>
 
 
-void bust_spinlocks(int yes)
+void __attribute__((weak)) bust_spinlocks(int yes)
 {
         if (yes) {
                 oops_in_progress = 1;