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alistair23-linux/arch/x86/kernel
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Yazen Ghannam 17ef4af0ec x86/mce/AMD: Use saved threshold block info in interrupt handler 
In the amd_threshold_interrupt() handler, we loop through every possible
block in each bank and rediscover the block's address and if it's valid,
e.g. valid, counter present and not locked.

However, we already have the address saved in the threshold blocks list
for each CPU and bank. The list only contains blocks that have passed
all the valid checks.

Besides the redundancy, there's also a smp_call_function* in
get_block_address() which causes a warning when servicing the interrupt:

 WARNING: CPU: 0 PID: 0 at kernel/smp.c:281 smp_call_function_single+0xdd/0xf0
 ...
 Call Trace:
  <IRQ>
  rdmsr_safe_on_cpu()
  get_block_address.isra.2()
  amd_threshold_interrupt()
  smp_threshold_interrupt()
  threshold_interrupt()

because we do get called in an interrupt handler *with* interrupts
disabled, which can result in a deadlock.

Drop the redundant valid checks and move the overflow check, logging and
block reset into a separate function.

Check the first block then iterate over the rest. This procedure is
needed since the first block is used as the head of the list.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170613162835.30750-3-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 		2017-06-14 07:32:06 +02:00
..
acpi Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 23:54:56 -07:00
apic Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 21:41:07 -07:00
cpu x86/mce/AMD: Use saved threshold block info in interrupt handler 2017-06-14 07:32:06 +02:00
fpu KVM: x86: Fix load damaged SSEx MXCSR register 2017-05-15 16:08:56 +02:00
kprobes kprobes/x86: Fix to set RWX bits correctly before releasing trampoline 2017-05-26 22:37:00 -04:00
.gitignore
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Makefile x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o 2017-03-24 10:14:08 +01:00
alternative.c x86/alternatives: Prevent uninitialized stack byte read in apply_alternatives() 2017-05-24 16:18:12 +02:00
amd_gart_64.c x86: use set_memory.h header 2017-05-08 17:15:13 -07:00
amd_nb.c x86/amd_nb: Add SMN and Indirect Data Fabric access for AMD Fam17h 2016-11-16 20:46:38 +01:00
apb_timer.c Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-25 14:30:04 -08:00
aperture_64.c x86/boot/e820: Prefix the E820_* type names with "E820_TYPE_" 2017-01-28 22:55:22 +01:00
apm_32.c x86: Remap GDT tables in the fixmap section 2017-03-16 09:06:35 +01:00
asm-offsets.c efi: Get and store the secure boot status 2017-02-07 10:42:10 +01:00
asm-offsets_32.c sched/x86: Rewrite the switch_to() code 2016-08-24 12:31:41 +02:00
asm-offsets_64.c x86/kvm: Provide optimized version of vcpu_is_preempted() for x86-64 2017-02-21 12:48:35 +01:00
audit_64.c
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bootflag.c
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check.c
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cpuid.c Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-12 19:25:04 -08:00
crash.c x86/boot/e820: Clean up the E820 table size define names 2017-01-28 22:55:23 +01:00
crash_dump_32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
crash_dump_64.c
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devicetree.c x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage 2016-04-13 11:37:41 +02:00
doublefault.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
dumpstack.c x86/unwind: Ensure stack pointer is aligned 2017-04-18 10:30:23 +02:00
dumpstack_32.c x86/debug: Implement __WARN() using UD0 2017-03-27 10:20:28 +02:00
dumpstack_64.c x86/debug: Implement __WARN() using UD0 2017-03-27 10:20:28 +02:00
e820.c x86/boot/e820: Remove a redundant self assignment 2017-04-14 11:43:21 +02:00
early-quirks.c main drm pull request for 4.12 kernel 2017-05-03 11:44:24 -07:00
early_printk.c x86/earlyprintk: Add support for earlyprintk via USB3 debug port 2017-03-21 12:30:16 +01:00
ebda.c x86/boot: Simplify EBDA-vs-BIOS reservation logic 2016-07-22 11:46:01 +02:00
espfix_64.c x86/espfix: Add support for 5-level paging 2017-04-04 08:22:34 +02:00
ftrace.c x86/ftrace: Make sure that ftrace trampolines are not RWX 2017-05-26 22:37:02 -04:00
ftrace_32.S x86/ftrace: Fix ebp in ftrace_regs_caller that screws up unwinder 2017-04-21 09:48:16 +02:00
ftrace_64.S x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o 2017-03-24 10:14:08 +01:00
head32.c x86/boot/e820: Move asm/e820.h to asm/e820/api.h 2017-01-28 09:31:13 +01:00
head64.c Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 20:51:12 -07:00
head_32.S x86/boot/32: Convert the 32-bit pgtable setup code from assembly to C 2017-01-06 08:39:26 +01:00
head_64.S x86/boot/64: Rename start_cpu() 2017-03-07 13:57:25 +01:00
hpet.c x86/hpet: Prevent might sleep splat on resume 2017-03-02 09:33:47 +01:00
hw_breakpoint.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
i8237.c
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i8253.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
i8259.c x86: i8259: export legacy_pic symbol 2017-04-14 12:08:51 +02:00
io_delay.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
ioport.c Second batch of KVM changes for 4.11 merge window 2017-03-04 11:36:19 -08:00
irq.c x86/irq: Optimize free vector check in the CPU offline path 2017-04-20 15:25:09 +02:00
irq_32.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
irq_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
irq_work.c x86/irq, trace: Add __irq_entry annotation to x86's platform IRQ handlers 2017-01-05 08:58:49 +01:00
irqinit.c x86/irq: Remove a redundant #ifdef directive 2017-04-14 22:43:01 +02:00
itmt.c sched/x86: Remove unnecessary TBM3 check to update topology 2017-01-19 08:42:37 +01:00
jump_label.c locking/jump_labels: Update bug_at() boot message 2017-01-12 09:43:07 +01:00
kdebugfs.c x86/kdebugfs: Move boot params hierarchy under (debugfs)/x86/ 2017-03-01 09:57:02 +01:00
kexec-bzimage64.c x86/boot/e820: Clean up the E820 table size define names 2017-01-28 22:55:23 +01:00
kgdb.c sched/x86: Add 'struct inactive_task_frame' to better document the sleeping task stack frame 2016-08-24 12:27:41 +02:00
ksysfs.c x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00
kvm.c kvm: async_pf: fix rcu_irq_enter() with irqs enabled 2017-06-06 14:43:16 +02:00
kvmclock.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h> 2017-03-02 08:42:27 +01:00
ldt.c Merge branch 'akpm' (patches from Andrew) 2016-12-12 20:50:02 -08:00
livepatch.c livepatch/x86: apply alternatives and paravirt patches after relocations 2016-08-18 23:41:55 +02:00
machine_kexec_32.c x86: use set_memory.h header 2017-05-08 17:15:13 -07:00
machine_kexec_64.c Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-12 10:11:50 -07:00
mmconf-fam10h_64.c
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module.c mm, vmalloc: use __GFP_HIGHMEM implicitly 2017-05-08 17:15:13 -07:00
mpparse.c x86/boot/e820: Rename early_reserve_e820() to e820__memblock_alloc() and document it 2017-01-28 14:42:30 +01:00
msr.c x86/msr: Remove bogus cleanup from the error path 2016-12-25 10:47:41 +01:00
nmi.c * An EDAC driver for Cavium ThunderX RAS IP (Sergey Temerkhanov) 2017-05-01 11:36:00 -07:00
nmi_selftest.c
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paravirt-spinlocks.c 4.11 is going to be a relatively large release for KVM, with a little over 2017-02-22 18:22:53 -08:00
paravirt.c x86/paravirt: Add 5-level support to the paravirt code 2017-04-04 08:22:34 +02:00
paravirt_patch_32.c x86/paravirt: Mark unused patch_default label 2016-12-22 17:43:35 +01:00
paravirt_patch_64.c x86/paravirt: Mark unused patch_default label 2016-12-22 17:43:35 +01:00
pci-calgary_64.c x86/pci-calgary: Use setup_timer() instead of open coding it. 2017-03-31 10:21:04 +02:00
pci-dma.c This is a tree wide change and has been kept separate for that reason. 2017-02-25 13:45:43 -08:00
pci-iommu_table.c x86: Fix non-static inlines 2016-04-16 13:21:40 +02:00
pci-nommu.c treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
pci-swiotlb.c treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
pcspeaker.c
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perf_regs.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
platform-quirks.c x86/init: Add i8042 state to the platform data 2016-12-19 11:34:15 +01:00
pmem.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
probe_roms.c x86/boot/e820: Move asm/e820.h to asm/e820/api.h 2017-01-28 09:31:13 +01:00
process.c x86/arch_prctl: Add ARCH_[GET|SET]_CPUID 2017-03-20 16:10:34 +01:00
process_32.c x86/debug/32: Convert a smp_processor_id() call to raw to avoid DEBUG_PREEMPT warning 2017-05-29 08:22:49 +02:00
process_64.c x86/xen: add CONFIG_XEN_PV to Kconfig 2017-05-02 10:50:19 +02:00
ptrace.c x86/arch_prctl/64: Rename do_arch_prctl() to do_arch_prctl_64() 2017-03-20 16:10:32 +01:00
pvclock.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h> 2017-03-02 08:42:30 +01:00
quirks.c x86/quirks: Hide maybe-uninitialized warning 2016-10-25 11:45:13 +02:00
reboot.c x86/mce: Handle broadcasted MCE gracefully with kexec 2017-03-13 20:18:07 +01:00
reboot_fixups_32.c
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relocate_kernel_32.S
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relocate_kernel_64.S
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resource.c x86/boot/e820: Harmonize the 'struct e820_table' fields 2017-01-28 09:33:16 +01:00
rtc.c timekeeping: Ignore the bogus sleep time if pm_trace is enabled 2016-11-29 18:02:58 +01:00
setup.c x86/timers: Move simple_udelay_calibration past init_hypervisor_platform 2017-05-26 13:04:09 +02:00
setup_percpu.c x86/boot/32: Fix UP boot on Quark and possibly other platforms 2017-05-09 08:14:24 +02:00
signal.c x86/debug: Fix the printk() debug output of signal_fault(), do_trap() and do_general_protection() 2017-04-11 09:11:13 +02:00
signal_compat.c x86/signals: Fix lower/upper bound reporting in compat siginfo 2017-04-05 10:16:43 +02:00
smp.c Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 20:51:12 -07:00
smpboot.c x86: Remap GDT tables in the fixmap section 2017-03-16 09:06:35 +01:00
stacktrace.c stacktrace/x86: add function for detecting reliable stack traces 2017-03-08 09:18:02 +01:00
step.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
sys_x86_64.c x86/hugetlb: Adjust to the new native/compat mmap bases 2017-03-14 16:29:16 +01:00
sysfb.c
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sysfb_efi.c Merge branch 'linus' into efi/core, to pick up fixes 2016-05-07 07:00:07 +02:00
sysfb_simplefb.c x86/sysfb: Fix lfb_size calculation 2016-11-16 09:38:23 +01:00
tboot.c IOMMU Updates for Linux v4.12 2017-05-09 15:15:47 -07:00
tce_64.c x86/cpufeature: Remove cpu_has_clflush 2016-03-31 13:35:09 +02:00
time.c
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tls.c x86/tls: Forcibly set the accessed bit in TLS segments 2017-03-19 12:14:35 +01:00
tls.h
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topology.c
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trace_clock.c
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tracepoint.c tracing: Have the reg function allow to fail 2016-12-09 09:13:30 -05:00
traps.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 22:07:51 -07:00
tsc.c sched/clock, x86/perf: Fix "perf test tsc" 2017-03-23 07:31:49 +01:00
tsc_msr.c x86/tsc: Set TSC_KNOWN_FREQ and TSC_RELIABLE flags on Intel Atom SoCs 2016-11-18 10:58:31 +01:00
tsc_sync.c x86/tsc: Make the TSC ADJUST sanitizing work for tsc_reliable 2017-02-10 09:47:17 +01:00
unwind_frame.c x86/unwind: Add end-of-stack check for ftrace handlers 2017-05-24 09:05:16 +02:00
unwind_guess.c x86/unwind: Ensure stack pointer is aligned 2017-04-18 10:30:23 +02:00
uprobes.c uprobes/x86: Fix RIP-relative handling of EVEX-encoded instructions 2016-08-12 08:29:24 +02:00
verify_cpu.S
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vm86_32.c x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly() 2017-04-26 10:02:06 +02:00
vmlinux.lds.S debug: Fix __bug_table[] in arch linker scripts 2017-04-03 10:22:40 +02:00
vsmp_64.c
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x86_init.c x86/boot/e820: Rename default_machine_specific_memory_setup() to e820__memory_setup_default() 2017-01-28 14:42:26 +01:00