This is a note to let you know that I've just added the patch titled
sparc64: Fix pcr_ops initialization and usage bugs.
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sparc64-fix-pcr_ops-initialization-and-usage-bugs.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Tue Oct 28 11:13:19 CST 2014
From: "David S. Miller" <[email protected]>
Date: Mon, 11 Aug 2014 15:38:46 -0700
Subject: sparc64: Fix pcr_ops initialization and usage bugs.
From: "David S. Miller" <[email protected]>
[ Upstream commit 8bccf5b313180faefce38e0d1140f76e0f327d28 ]
Christopher reports that perf_event_print_debug() can crash in uniprocessor
builds. The crash is due to pcr_ops being NULL.
This happens because pcr_arch_init() is only invoked by smp_cpus_done() which
only executes in SMP builds.
init_hw_perf_events() is closely intertwined with pcr_ops being setup properly,
therefore:
1) Call pcr_arch_init() early on from init_hw_perf_events(), instead of
from smp_cpus_done().
2) Do not hook up a PMU type if pcr_ops is NULL after pcr_arch_init().
3) Move init_hw_perf_events to a later initcall so that it we will be
sure to invoke pcr_arch_init() after all cpus are brought up.
Finally, guard the one naked sequence of pcr_ops dereferences in
__global_pmu_self() with an appropriate NULL check.
Reported-by: Christopher Alexander Tobias Schulze <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/sparc/kernel/perf_event.c | 7 +++++--
arch/sparc/kernel/process_64.c | 3 +++
arch/sparc/kernel/smp_64.c | 1 -
3 files changed, 8 insertions(+), 3 deletions(-)
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1671,9 +1671,12 @@ static bool __init supported_pmu(void)
int __init init_hw_perf_events(void)
{
+ int err;
+
pr_info("Performance events: ");
- if (!supported_pmu()) {
+ err = pcr_arch_init();
+ if (err || !supported_pmu()) {
pr_cont("No support for PMU type '%s'\n", sparc_pmu_type);
return 0;
}
@@ -1685,7 +1688,7 @@ int __init init_hw_perf_events(void)
return 0;
}
-early_initcall(init_hw_perf_events);
+pure_initcall(init_hw_perf_events);
void perf_callchain_kernel(struct perf_callchain_entry *entry,
struct pt_regs *regs)
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -306,6 +306,9 @@ static void __global_pmu_self(int this_c
struct global_pmu_snapshot *pp;
int i, num;
+ if (!pcr_ops)
+ return;
+
pp = &global_cpu_snapshot[this_cpu].pmu;
num = 1;
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1395,7 +1395,6 @@ void __cpu_die(unsigned int cpu)
void __init smp_cpus_done(unsigned int max_cpus)
{
- pcr_arch_init();
}
void smp_send_reschedule(int cpu)
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/sparc64-adjust-vmalloc-region-size-based-upon-available-virtual-address-bits.patch
queue-3.14/sparc64-fix-fpu-register-corruption-with-aes-crypto-offload.patch
queue-3.14/sparc64-move-request_irq-from-ldc_bind-to-ldc_alloc.patch
queue-3.14/sparc32-dma_alloc_coherent-must-honour-gfp-flags.patch
queue-3.14/sparc64-kill-unnecessary-tables-and-increase-max_banks.patch
queue-3.14/sparc-let-memset-return-the-address-argument.patch
queue-3.14/sparc64-use-kernel-page-tables-for-vmemmap.patch
queue-3.14/sparc64-sparse-irq.patch
queue-3.14/sparc64-fix-physical-memory-management-regressions-with-large-max_phys_bits.patch
queue-3.14/sparc64-fix-lockdep-warnings-on-reboot-on-ultra-5.patch
queue-3.14/sparc64-switch-to-4-level-page-tables.patch
queue-3.14/sparc64-sun4v-tlb-error-power-off-events.patch
queue-3.14/sparc64-increase-size-of-boot-string-to-1024-bytes.patch
queue-3.14/sparc64-find_node-adjustment.patch
queue-3.14/sparc64-fix-reversed-start-end-in-flush_tlb_kernel_range.patch
queue-3.14/sparc64-increase-max_phys_address_bits-to-53.patch
queue-3.14/sparc64-define-va-hole-at-run-time-rather-than-at-compile-time.patch
queue-3.14/sparc64-fix-register-corruption-in-top-most-kernel-stack-frame-during-boot.patch
queue-3.14/sparc64-do-not-disable-interrupts-in-nmi_cpu_busy.patch
queue-3.14/sparc64-support-m6-and-m7-for-building-cpu-distribution-map.patch
queue-3.14/sparc64-cpu-hardware-caps-support-for-sparc-m6-and-m7.patch
queue-3.14/sparc64-do-not-define-thread-fpregs-save-area-as-zero-length-array.patch
queue-3.14/sparc64-t5-pmu.patch
queue-3.14/sparc64-adjust-ktsb-assembler-to-support-larger-physical-addresses.patch
queue-3.14/sparc64-implement-__get_user_pages_fast.patch
queue-3.14/sparc64-fix-corrupted-thread-fault-code.patch
queue-3.14/sparc64-fix-hibernation-code-refrence-to-page_offset.patch
queue-3.14/sparc64-correctly-recognise-m6-and-m7-cpu-type.patch
queue-3.14/sparc64-fix-pcr_ops-initialization-and-usage-bugs.patch
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