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Merge branch 'core-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull core debug changes from Ingo Molnar:
 "Currently there are two methods to set the panic_timeout: via
  'panic=X' boot commandline option, or via /proc/sys/kernel/panic.

  This tree adds a third panic_timeout configuration method:
  configuration via Kconfig, via CONFIG_PANIC_TIMEOUT=X - useful to
  distros that generally want their kernel defaults to come with the
  .config.

  CONFIG_PANIC_TIMEOUT defaults to 0, which was the previous default
  value of panic_timeout.

  Doing that unearthed a few arch trickeries regarding arch-special
  panic_timeout values and related complications - hopefully all
  resolved to the satisfaction of everyone"

* 'core-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  powerpc: Clean up panic_timeout usage
  MIPS: Remove panic_timeout settings
  panic: Make panic_timeout configurable
This commit is contained in:
Linus Torvalds 2014-01-20 10:22:12 -08:00
commit 897aea303f
13 changed files with 25 additions and 16 deletions
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1
arch/mips/ar7/setup.c
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@ -92,7 +92,6 @@ void __init plat_mem_setup(void)
_machine_restart = ar7_machine_restart;
_machine_halt = ar7_machine_halt;
pm_power_off = ar7_machine_power_off;
panic_timeout = 3;
io_base = (unsigned long)ioremap(AR7_REGS_BASE, 0x10000);
if (!io_base)

3
arch/mips/emma/markeins/setup.c
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@ -111,9 +111,6 @@ void __init plat_mem_setup(void)
iomem_resource.start = EMMA2RH_IO_BASE;
iomem_resource.end = EMMA2RH_ROM_BASE - 1;
/* Reboot on panic */
panic_timeout = 180;
markeins_sio_setup();
}

1
arch/mips/netlogic/xlp/setup.c
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@ -92,7 +92,6 @@ static void __init xlp_init_mem_from_bars(void)
void __init plat_mem_setup(void)
{
panic_timeout = 5;
_machine_restart = (void (*)(char *))nlm_linux_exit;
_machine_halt = nlm_linux_exit;
pm_power_off = nlm_linux_exit;

1
arch/mips/netlogic/xlr/setup.c
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@ -92,7 +92,6 @@ static void nlm_linux_exit(void)
void __init plat_mem_setup(void)
{
panic_timeout = 5;
_machine_restart = (void (*)(char *))nlm_linux_exit;
_machine_halt = nlm_linux_exit;
pm_power_off = nlm_linux_exit;

2
arch/mips/sibyte/swarm/setup.c
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@ -134,8 +134,6 @@ void __init plat_mem_setup(void)
#error invalid SiByte board configuration
#endif
panic_timeout = 5; /* For debug. */
board_be_handler = swarm_be_handler;
if (xicor_probe())

4
arch/powerpc/Kconfig
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@ -147,6 +147,10 @@ config EARLY_PRINTK
bool
default y
config PANIC_TIMEOUT
int
default 180
config COMPAT
bool
default y if PPC64

1
arch/powerpc/include/asm/setup.h
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@ -26,6 +26,7 @@ extern void reloc_got2(unsigned long);
void check_for_initrd(void);
void do_init_bootmem(void);
void setup_panic(void);
#define ARCH_PANIC_TIMEOUT 180
#endif /* !__ASSEMBLY__ */

3
arch/powerpc/kernel/setup_32.c
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@ -296,9 +296,6 @@ void __init setup_arch(char **cmdline_p)
if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
ucache_bsize = icache_bsize = dcache_bsize;
/* reboot on panic */
panic_timeout = 180;
if (ppc_md.panic)
setup_panic();

3
arch/powerpc/kernel/setup_64.c
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@ -588,9 +588,6 @@ void __init setup_arch(char **cmdline_p)
dcache_bsize = ppc64_caches.dline_size;
icache_bsize = ppc64_caches.iline_size;
/* reboot on panic */
panic_timeout = 180;
if (ppc_md.panic)
setup_panic();

2
arch/powerpc/platforms/pseries/setup.c
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@ -470,7 +470,7 @@ static long pseries_little_endian_exceptions(void)
static void __init pSeries_setup_arch(void)
{
panic_timeout = 10;
set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
/* Discover PIC type and setup ppc_md accordingly */
pseries_discover_pic();

9
include/linux/kernel.h
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@ -394,6 +394,15 @@ extern int panic_on_oops;
extern int panic_on_unrecovered_nmi;
extern int panic_on_io_nmi;
extern int sysctl_panic_on_stackoverflow;
/*
* Only to be used by arch init code. If the user over-wrote the default
* CONFIG_PANIC_TIMEOUT, honor it.
*/
static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
{
if (panic_timeout == arch_default_timeout)
panic_timeout = timeout;
}
extern const char *print_tainted(void);
enum lockdep_ok {
LOCKDEP_STILL_OK,

2
kernel/panic.c
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@ -33,7 +33,7 @@ static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);
int panic_timeout;
int panic_timeout = CONFIG_PANIC_TIMEOUT;
EXPORT_SYMBOL_GPL(panic_timeout);
ATOMIC_NOTIFIER_HEAD(panic_notifier_list);

9
lib/Kconfig.debug
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@ -761,6 +761,15 @@ config PANIC_ON_OOPS_VALUE
default 0 if !PANIC_ON_OOPS
default 1 if PANIC_ON_OOPS
config PANIC_TIMEOUT
int "panic timeout"
default 0
help
Set the timeout value (in seconds) until a reboot occurs when the
the kernel panics. If n = 0, then we wait forever. A timeout
value n > 0 will wait n seconds before rebooting, while a timeout
value n < 0 will reboot immediately.
config SCHED_DEBUG
bool "Collect scheduler debugging info"
depends on DEBUG_KERNEL && PROC_FS