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x86-64: honor notify_die() returning NOTIFY_STOP

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This requires making die() return a value, making its callers honor
this (and be prepared that it may return), and making oops_end() have
two additional parameters.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jan Beulich 2008-01-30 13:31:23 +01:00 committed by Ingo Molnar
parent d88879b2d0
commit 22f5991c85
4 changed files with 27 additions and 20 deletions
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8
arch/x86/kernel/cpu/mcheck/mce_64.c
View file

@ -192,10 +192,10 @@ void do_machine_check(struct pt_regs * regs, long error_code)
atomic_inc(&mce_entry);
if (regs)
notify_die(DIE_NMI, "machine check", regs, error_code, 18,
SIGKILL);
if (!banks)
if ((regs
&& notify_die(DIE_NMI, "machine check", regs, error_code,
18, SIGKILL) == NOTIFY_STOP)
|| !banks)
goto out2;
memset(&m, 0, sizeof(struct mce));

23
arch/x86/kernel/traps_64.c
View file

@ -488,7 +488,7 @@ unsigned __kprobes long oops_begin(void)
return flags;
}
void __kprobes oops_end(unsigned long flags)
void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
die_owner = -1;
bust_spinlocks(0);
@ -497,12 +497,17 @@ void __kprobes oops_end(unsigned long flags)
/* Nest count reaches zero, release the lock. */
__raw_spin_unlock(&die_lock);
raw_local_irq_restore(flags);
if (!regs) {
oops_exit();
return;
}
if (panic_on_oops)
panic("Fatal exception");
oops_exit();
do_exit(signr);
}
void __kprobes __die(const char * str, struct pt_regs * regs, long err)
int __kprobes __die(const char * str, struct pt_regs * regs, long err)
{
static int die_counter;
printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
@ -516,7 +521,8 @@ void __kprobes __die(const char * str, struct pt_regs * regs, long err)
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
if (notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
return 1;
show_registers(regs);
add_taint(TAINT_DIE);
/* Executive summary in case the oops scrolled away */
@ -525,6 +531,7 @@ void __kprobes __die(const char * str, struct pt_regs * regs, long err)
printk(" RSP <%016lx>\n", regs->sp);
if (kexec_should_crash(current))
crash_kexec(regs);
return 0;
}
void die(const char * str, struct pt_regs * regs, long err)
@ -534,9 +541,9 @@ void die(const char * str, struct pt_regs * regs, long err)
if (!user_mode(regs))
report_bug(regs->ip, regs);
__die(str, regs, err);
oops_end(flags);
do_exit(SIGSEGV);
if (__die(str, regs, err))
regs = NULL;
oops_end(flags, regs, SIGSEGV);
}
void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
@ -553,10 +560,10 @@ void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
crash_kexec(regs);
if (do_panic || panic_on_oops)
panic("Non maskable interrupt");
oops_end(flags);
oops_end(flags, NULL, SIGBUS);
nmi_exit();
local_irq_enable();
do_exit(SIGSEGV);
do_exit(SIGBUS);
}
static void __kprobes do_trap(int trapnr, int signr, char *str,

12
arch/x86/mm/fault_64.c
View file

@ -227,9 +227,9 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
tsk->thread.cr2 = address;
tsk->thread.trap_no = 14;
tsk->thread.error_code = error_code;
__die("Bad pagetable", regs, error_code);
oops_end(flags);
do_exit(SIGKILL);
if (__die("Bad pagetable", regs, error_code))
regs = NULL;
oops_end(flags, regs, SIGKILL);
}
/*
@ -541,11 +541,11 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
tsk->thread.cr2 = address;
tsk->thread.trap_no = 14;
tsk->thread.error_code = error_code;
__die("Oops", regs, error_code);
if (__die("Oops", regs, error_code))
regs = NULL;
/* Executive summary in case the body of the oops scrolled away */
printk(KERN_EMERG "CR2: %016lx\n", address);
oops_end(flags);
do_exit(SIGKILL);
oops_end(flags, regs, SIGKILL);
/*
* We ran out of memory, or some other thing happened to us that made

4
include/asm-x86/kdebug.h
View file

@ -25,7 +25,7 @@ enum die_val {
extern void early_printk(const char *fmt, ...) __attribute__((format(printf,1,2)));
extern void printk_address(unsigned long address);
extern void die(const char *,struct pt_regs *,long);
extern void __die(const char *,struct pt_regs *,long);
extern int __must_check __die(const char *, struct pt_regs *, long);
extern void show_registers(struct pt_regs *regs);
extern void __show_registers(struct pt_regs *, int all);
extern void show_trace(struct task_struct *, struct pt_regs *, unsigned long *);
@ -33,6 +33,6 @@ extern void __show_regs(struct pt_regs *regs);
extern void show_regs(struct pt_regs *regs);
extern void dump_pagetable(unsigned long);
extern unsigned long oops_begin(void);
extern void oops_end(unsigned long);
extern void oops_end(unsigned long, struct pt_regs *, int signr);
#endif