The machine check handler registers ioctl handler that is called
with the BKL held. Changing to register unlocked_ioctl instead.
Also mce ioctl handler does not seem to need any lock protection.
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org
Change the Machine check handler to use unlocked_ioctl instead of
ioctl handler. Also the mce ioctl handler does not need any lock
protection.
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
#88: FILE: arch/x86/kernel/cpu/mcheck/k7.c:34:
+ rdmsr(MSR_IA32_MC0_STATUS+i*4,low, high);
^
ERROR: need space after that ',' (ctx:VxV)
#142: FILE: arch/x86/kernel/cpu/mcheck/p4.c:170:
+ rdmsr(MSR_IA32_MC0_STATUS+i*4,low, high);
^
ERROR: need space after that ',' (ctx:VxV)
#180: FILE: arch/x86/kernel/cpu/mcheck/p6.c:34:
+ rdmsr(MSR_IA32_MC0_STATUS+i*4,low, high);
^
total: 3 errors, 0 warnings, 114 lines checked
Your patch has style problems, please review. If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
Please run checkpatch prior to sending patches
Cc: Min Zhang <mzhang@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
#40: FILE: arch/x86/kernel/cpu/mcheck/k7.c:46:
+ snprintf (misc, 20, "[%08x%08x]", ahigh, alow);
WARNING: line over 80 characters
#45: FILE: arch/x86/kernel/cpu/mcheck/k7.c:50:
+ snprintf (addr, 24, " at %08x%08x", ahigh, alow);
WARNING: no space between function name and open parenthesis '('
#45: FILE: arch/x86/kernel/cpu/mcheck/k7.c:50:
+ snprintf (addr, 24, " at %08x%08x", ahigh, alow);
WARNING: no space between function name and open parenthesis '('
#48: FILE: arch/x86/kernel/cpu/mcheck/k7.c:52:
+ printk (KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
WARNING: no space between function name and open parenthesis '('
#65: FILE: arch/x86/kernel/cpu/mcheck/p4.c:161:
+ printk (KERN_DEBUG "CPU %d: EIP: %08x EFLAGS: %08x\n"
WARNING: no space between function name and open parenthesis '('
#88: FILE: arch/x86/kernel/cpu/mcheck/p4.c:182:
+ snprintf (misc, 20, "[%08x%08x]", ahigh, alow);
WARNING: line over 80 characters
#93: FILE: arch/x86/kernel/cpu/mcheck/p4.c:186:
+ snprintf (addr, 24, " at %08x%08x", ahigh, alow);
WARNING: no space between function name and open parenthesis '('
#93: FILE: arch/x86/kernel/cpu/mcheck/p4.c:186:
+ snprintf (addr, 24, " at %08x%08x", ahigh, alow);
WARNING: no space between function name and open parenthesis '('
#96: FILE: arch/x86/kernel/cpu/mcheck/p4.c:188:
+ printk (KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
WARNING: no space between function name and open parenthesis '('
#120: FILE: arch/x86/kernel/cpu/mcheck/p6.c:46:
+ snprintf (misc, 20, "[%08x%08x]", ahigh, alow);
WARNING: line over 80 characters
#125: FILE: arch/x86/kernel/cpu/mcheck/p6.c:50:
+ snprintf (addr, 24, " at %08x%08x", ahigh, alow);
WARNING: no space between function name and open parenthesis '('
#125: FILE: arch/x86/kernel/cpu/mcheck/p6.c:50:
+ snprintf (addr, 24, " at %08x%08x", ahigh, alow);
WARNING: no space between function name and open parenthesis '('
#128: FILE: arch/x86/kernel/cpu/mcheck/p6.c:52:
+ printk (KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
total: 0 errors, 13 warnings, 100 lines checked
Your patch has style problems, please review. If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
Please run checkpatch prior to sending patches
Cc: Min Zhang <mzhang@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
SMP, the machine check exception dispatches all logical processors within a
physical package to the machine-check exception handler, so the printk
within each handler outputs concurrently and makes the output unreadable.
Refer to Intel system programming guide Part 1 Section 7.8.5
http://developer.intel.com/design/processor/manuals/253668.pdf
Signed-off-by: Min Zhang <mzhang@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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>
Converted to a mutex, and changed the name to mce_read_mutex.
Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
fastcall is always defined to be empty, remove it from arch/x86
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
We have a lot of code which differs only by the naming of specific
members of structures that contain registers. In order to enable
additional unifications, this patch drops the e- or r- size prefix
from the register names in struct pt_regs, and drops the x- prefixes
for segment registers on the 32-bit side.
This patch also performs the equivalent renames in some additional
places that might be candidates for unification in the future.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
The patch to suppress bitops-related warnings added a pile of ugly
casts. Many of these were related to the management of x86 CPU
capabilities. Clean these up by adding specific set/clear_cpu_cap
macros, and use them consistently.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This patch makes the needlessly global struct mcelog static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
the logic in this function is just crazy. It's recursive, but we
can circumvent the creation for the kobject and whole creation of the
threshold_block if some conditions are met. That's why we see the
allocate_threshold_blocks so many times in the callstack, yet only a few
kobjects created.
Then we blow up in kobject_uevent_env() on the first debug printk.
Which means that we are just passing in garbage.
Man, this is one time that comments in code would have been very nice to
have, and why forward goto's into major code blocks are just evil...
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
All kobjects require a dynamically allocated name now. We no longer
need to keep track if the name is statically assigned, we can just
unconditionally free() all kobject names on cleanup.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
There is no need for kobject_unregister() anymore, thanks to Kay's
kobject cleanup changes, so replace all instances of it with
kobject_put().
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Stop using kobject_register, as this way we can control the sending of
the uevent properly, after everything is properly initialized.
Cc: Jacob Shin <jacob.shin@amd.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Make this kobject dynamic and convert it to not use kobject_register,
which is going away.
Cc: Jacob Shin <jacob.shin@amd.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Commit d435d862ba
("cpu hotplug: mce: fix cpu hotplug error handling")
changed the error handling in mce_cpu_callback.
In cases where not all CPUs are brought up during
boot (e.g. using maxcpus and additional_cpus parameters)
mce_cpu_callback now returns NOTFIY_BAD because
for such CPUs cpu_data is not completely filled when
the notifier is called. Thus mce_create_device fails right
at its beginning:
if (!mce_available(&cpu_data[cpu]))
return -EIO;
As a quick fix I suggest to check boot_cpu_data for MCE.
To reproduce this regression:
(1) boot with maxcpus=2 addtional_cpus=2 on a 4 CPU x86-64 system
(2) # echo 1 >/sys/devices/system/cpu/cpu2/online
-bash: echo: write error: Invalid argument
dmesg shows:
_cpu_up: attempt to bring up CPU 2 failed
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Fix regression introduced with d435d862ba
("cpu hotplug: mce: fix cpu hotplug error handling").
A CPU which was not brought up during boot (using maxcpus and
additional_cpus parameters) couldn't be onlined anymore. For such a CPU it
seemed that MCE was not supported during CPU_UP_PREPARE-time which caused
mce_cpu_callback to return NOTIFY_BAD to notifier_call_chain. To fix this
we:
- call mce_create_device for CPU_ONLINE event (instead of CPU_UP_PREPARE),
- avoid mce_remove_device() for the CPU that is not correctly initialized
by mce_create_device() failure,
- make mce_cpu_callback always return NOTIFY_OK for CPU_ONLINE event.
Because CPU_ONLINE callback return value is always ignored.
[akinobu.mita@gmail.com: avoid mce_remove_device() for not initialized device]
[akinobu.mita@gmail.com: make mce_cpu_callback always return NOTIFY_OK]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The x86_64 arch/x86/kernel/Makefile uses references into
arch/x86/kernel/cpu/... to use code from there.
Unifiy it with the nicely structured i386 way and reuse the existing
subdirectory make rules.
Also move the machine check related source into ...kernel/cpu/mcheck,
where the other machine check related code is.
No code change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Move mce.c to mce_32.c to allow the later move of the x86_64 mce.c
from arch/x86/kernel/ to ...kernel/cpu/mcheck
No code change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Prepare the makefiles in x86/kernel/cpu and x86/kernel/cpu/mcheck to
be used by the x86_64 build as well.
No code change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Add missing IRQs and IRQ descriptions to /proc/interrupts.
/proc/interrupts is most useful when it displays every IRQ vector in use by
the system, not just those somebody thought would be interesting.
This patch inserts the following vector displays to the i386 and x86_64
platforms, as appropriate:
rescheduling interrupts
TLB flush interrupts
function call interrupts
thermal event interrupts
threshold interrupts
spurious interrupts
A threshold interrupt occurs when ECC memory correction is occuring at too
high a frequency. Thresholds are used by the ECC hardware as occasional
ECC failures are part of normal operation, but long sequences of ECC
failures usually indicate a memory chip that is about to fail.
Thermal event interrupts occur when a temperature threshold has been
exceeded for some CPU chip. IIRC, a thermal interrupt is also generated
when the temperature drops back to a normal level.
A spurious interrupt is an interrupt that was raised then lowered by the
device before it could be fully processed by the APIC. Hence the apic sees
the interrupt but does not know what device it came from. For this case
the APIC hardware will assume a vector of 0xff.
Rescheduling, call, and TLB flush interrupts are sent from one CPU to
another per the needs of the OS. Typically, their statistics would be used
to discover if an interrupt flood of the given type has been occuring.
AK: merged v2 and v4 which had some more tweaks
AK: replace Local interrupts with Local timer interrupts
AK: Fixed description of interrupt types.
[ tglx: arch/x86 adaptation ]
[ mingo: small cleanup ]
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Tim Hockin <thockin@hockin.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Fix bugzilla #8679
WARNING: arch/i386/kernel/built-in.o(.data+0x2148): Section mismatch: reference
to .init.text: (between 'thermal_throttle_cpu_notifier' and 'mtrr_mutex')
comes because struct notifier_block thermal_throttle_cpu_notifier in
arch/i386/kernel/cpu/mcheck/therm_throt.c goes in .data section but the
notifier callback function itself has been marked __cpuinit which becomes
__init == .init.text when HOTPLUG_CPU=n. The warning is bogus because the
callback will never be called out if HOTPLUG_CPU=n in the first place (as
one can see from kernel/cpu.c, the cpu_chain itself is __cpuinitdata :-)
So, let's mark thermal_throttle_cpu_notifier as __cpuinitdata to fix
the section mismatch warning.
[ tglx: arch/x86 adaptation ]
Signed-off-by: Satyam Sharma <satyam@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
