From 81e88fdc432a1552401d6e91a984dcccce72b8dc Mon Sep 17 00:00:00 2001 From: Huang Ying Date: Wed, 12 Jan 2011 14:44:55 +0800 Subject: ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support Generic Hardware Error Source provides a way to report platform hardware errors (such as that from chipset). It works in so called "Firmware First" mode, that is, hardware errors are reported to firmware firstly, then reported to Linux by firmware. This way, some non-standard hardware error registers or non-standard hardware link can be checked by firmware to produce more valuable hardware error information for Linux. This patch adds POLL/IRQ/NMI notification types support. Because the memory area used to transfer hardware error information from BIOS to Linux can be determined only in NMI, IRQ or timer handler, but general ioremap can not be used in atomic context, so a special version of atomic ioremap is implemented for that. Known issue: - Error information can not be printed for recoverable errors notified via NMI, because printk is not NMI-safe. Will fix this via delay printing to IRQ context via irq_work or make printk NMI-safe. v2: - adjust printk format per comments. Signed-off-by: Huang Ying Reviewed-by: Andi Kleen Signed-off-by: Len Brown --- kernel/panic.c | 1 + 1 file changed, 1 insertion(+) (limited to 'kernel/panic.c') diff --git a/kernel/panic.c b/kernel/panic.c index 4c13b1a88eb..991bb87a170 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -34,6 +34,7 @@ static int pause_on_oops_flag; static DEFINE_SPINLOCK(pause_on_oops_lock); int panic_timeout; +EXPORT_SYMBOL_GPL(panic_timeout); ATOMIC_NOTIFIER_HEAD(panic_notifier_list); -- cgit v1.2.3-70-g09d2 From d404ab0a1133e95557bb7deab2a49b348dfeba85 Mon Sep 17 00:00:00 2001 From: Olaf Hering Date: Tue, 22 Mar 2011 16:34:04 -0700 Subject: move x86 specific oops=panic to generic code The oops=panic cmdline option is not x86 specific, move it to generic code. Update documentation. Signed-off-by: Olaf Hering Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/kernel-parameters.txt | 5 +++++ Documentation/x86/x86_64/boot-options.txt | 5 ----- arch/x86/kernel/dumpstack.c | 10 ---------- kernel/panic.c | 10 ++++++++++ 4 files changed, 15 insertions(+), 15 deletions(-) (limited to 'kernel/panic.c') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index d18a9e12152..a3b688287a8 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1825,6 +1825,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. perfmon on Intel CPUs instead of the CPU specific event set. + oops=panic Always panic on oopses. Default is to just kill the process, + but there is a small probability of deadlocking the machine. + This will also cause panics on machine check exceptions. + Useful together with panic=30 to trigger a reboot. + OSS [HW,OSS] See Documentation/sound/oss/oss-parameters.txt diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt index 48c13b8ab90..092e596a130 100644 --- a/Documentation/x86/x86_64/boot-options.txt +++ b/Documentation/x86/x86_64/boot-options.txt @@ -293,11 +293,6 @@ IOMMU (input/output memory management unit) Debugging - oops=panic Always panic on oopses. Default is to just kill the process, - but there is a small probability of deadlocking the machine. - This will also cause panics on machine check exceptions. - Useful together with panic=30 to trigger a reboot. - kstack=N Print N words from the kernel stack in oops dumps. pagefaulttrace Dump all page faults. Only useful for extreme debugging diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 999e2793590..81ac6c78c01 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -322,16 +322,6 @@ void die(const char *str, struct pt_regs *regs, long err) oops_end(flags, regs, sig); } -static int __init oops_setup(char *s) -{ - if (!s) - return -EINVAL; - if (!strcmp(s, "panic")) - panic_on_oops = 1; - return 0; -} -early_param("oops", oops_setup); - static int __init kstack_setup(char *s) { if (!s) diff --git a/kernel/panic.c b/kernel/panic.c index 991bb87a170..69231670eb9 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -433,3 +433,13 @@ EXPORT_SYMBOL(__stack_chk_fail); core_param(panic, panic_timeout, int, 0644); core_param(pause_on_oops, pause_on_oops, int, 0644); + +static int __init oops_setup(char *s) +{ + if (!s) + return -EINVAL; + if (!strcmp(s, "panic")) + panic_on_oops = 1; + return 0; +} +early_param("oops", oops_setup); -- cgit v1.2.3-70-g09d2