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authorYury Polyanskiy <ypolyans@princeton.edu>2010-04-26 08:53:10 +0400
committerRalf Baechle <ralf@linux-mips.org>2010-04-30 23:52:45 +0400
commitce384d83d00ee457c3931d3fdb9fa2c38e345a3c (patch)
tree9f2a8a21236f0a270118d393e893cdc4986d229b
parentfcf3ca4c3d6d911df8ee2b8f010ffe504d3aef71 (diff)
downloadlinux-ce384d83d00ee457c3931d3fdb9fa2c38e345a3c.tar.xz
MIPS: die() does not call die notifier chain
The MIPS implementation of die() forgets to call notify_die() and thus notifiers registered via register_die_notifier() are not called. This results in kgdb not being activated on exceptions. The only subtlety is that notify_die declares its regs argument w/o const, so the const had to be removed from mips die() as well. [Ralf: Fixed build error for SGI IP22 and IP28 platforms.] Signed-off-by: Yury Polyanskiy <ypolyans@princeton.edu> Cc: linux-mips@linux-mips.org Patchworks: http://patchwork.linux-mips.org/patch/1142/ Acked-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> ---
-rw-r--r--arch/mips/include/asm/ptrace.h4
-rw-r--r--arch/mips/kernel/traps.c9
-rw-r--r--arch/mips/sgi-ip22/ip22-berr.c2
-rw-r--r--arch/mips/sgi-ip22/ip28-berr.c2
4 files changed, 11 insertions, 6 deletions
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
index ce47118e52b7..cdc6a46efd98 100644
--- a/arch/mips/include/asm/ptrace.h
+++ b/arch/mips/include/asm/ptrace.h
@@ -142,9 +142,9 @@ extern int ptrace_set_watch_regs(struct task_struct *child,
extern asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit);
-extern NORET_TYPE void die(const char *, const struct pt_regs *) ATTRIB_NORET;
+extern NORET_TYPE void die(const char *, struct pt_regs *) ATTRIB_NORET;
-static inline void die_if_kernel(const char *str, const struct pt_regs *regs)
+static inline void die_if_kernel(const char *str, struct pt_regs *regs)
{
if (unlikely(!user_mode(regs)))
die(str, regs);
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 1a4dd657ccb9..36460c7b7cc8 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -352,9 +352,10 @@ void show_registers(const struct pt_regs *regs)
static DEFINE_SPINLOCK(die_lock);
-void __noreturn die(const char * str, const struct pt_regs * regs)
+void __noreturn die(const char * str, struct pt_regs * regs)
{
static int die_counter;
+ int sig = SIGSEGV;
#ifdef CONFIG_MIPS_MT_SMTC
unsigned long dvpret = dvpe();
#endif /* CONFIG_MIPS_MT_SMTC */
@@ -365,6 +366,10 @@ void __noreturn die(const char * str, const struct pt_regs * regs)
#ifdef CONFIG_MIPS_MT_SMTC
mips_mt_regdump(dvpret);
#endif /* CONFIG_MIPS_MT_SMTC */
+
+ if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
+ sig = 0;
+
printk("%s[#%d]:\n", str, ++die_counter);
show_registers(regs);
add_taint(TAINT_DIE);
@@ -379,7 +384,7 @@ void __noreturn die(const char * str, const struct pt_regs * regs)
panic("Fatal exception");
}
- do_exit(SIGSEGV);
+ do_exit(sig);
}
extern struct exception_table_entry __start___dbe_table[];
diff --git a/arch/mips/sgi-ip22/ip22-berr.c b/arch/mips/sgi-ip22/ip22-berr.c
index de6a0cc32fea..911d3999c0c7 100644
--- a/arch/mips/sgi-ip22/ip22-berr.c
+++ b/arch/mips/sgi-ip22/ip22-berr.c
@@ -89,7 +89,7 @@ static void print_buserr(void)
void ip22_be_interrupt(int irq)
{
const int field = 2 * sizeof(unsigned long);
- const struct pt_regs *regs = get_irq_regs();
+ struct pt_regs *regs = get_irq_regs();
save_and_clear_buserr();
print_buserr();
diff --git a/arch/mips/sgi-ip22/ip28-berr.c b/arch/mips/sgi-ip22/ip28-berr.c
index 30e12e2ec4b5..88c684e05a3d 100644
--- a/arch/mips/sgi-ip22/ip28-berr.c
+++ b/arch/mips/sgi-ip22/ip28-berr.c
@@ -453,7 +453,7 @@ mips_be_fatal:
void ip22_be_interrupt(int irq)
{
- const struct pt_regs *regs = get_irq_regs();
+ struct pt_regs *regs = get_irq_regs();
count_be_interrupt++;