From: Peter Zijlstra <peterz@infradead.org>
To: tglx@linutronix.de
Cc: x86@kernel.org, elver@google.com, paulmck@kernel.org,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
peterz@infradead.org, will@kernel.org, dvyukov@google.com,
glider@google.com, andreyknvl@google.com
Subject: [PATCH 9/9] x86/entry, cpumask: Provide non-instrumented variant of cpu_is_offline()
Date: Wed, 03 Jun 2020 13:40:23 +0200 [thread overview]
Message-ID: <20200603114052.300804240@infradead.org> (raw)
In-Reply-To: 20200603114014.152292216@infradead.org
vmlinux.o: warning: objtool: exc_nmi()+0x12: call to cpumask_test_cpu.constprop.0() leaves .noinstr.text section
vmlinux.o: warning: objtool: mce_check_crashing_cpu()+0x12: call to cpumask_test_cpu.constprop.0()leaves .noinstr.text section
cpumask_test_cpu()
test_bit()
instrument_atomic_read()
arch_test_bit()
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/kernel/cpu/mce/core.c | 2 +-
arch/x86/kernel/nmi.c | 2 +-
include/linux/cpumask.h | 15 ++++++++++++++-
3 files changed, 16 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1083,7 +1083,7 @@ static noinstr bool mce_check_crashing_c
{
unsigned int cpu = smp_processor_id();
- if (cpu_is_offline(cpu) ||
+ if (arch_cpu_is_offline(cpu) ||
(crashing_cpu != -1 && crashing_cpu != cpu)) {
u64 mcgstatus;
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -478,7 +478,7 @@ static DEFINE_PER_CPU(unsigned long, nmi
DEFINE_IDTENTRY_NMI(exc_nmi)
{
- if (IS_ENABLED(CONFIG_SMP) && cpu_is_offline(smp_processor_id()))
+ if (IS_ENABLED(CONFIG_SMP) && arch_cpu_is_offline(smp_processor_id()))
return;
if (this_cpu_read(nmi_state) != NMI_NOT_RUNNING) {
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -888,7 +888,20 @@ static inline const struct cpumask *get_
return to_cpumask(p);
}
-#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
+#if NR_CPUS > 1
+static __always_inline bool arch_cpu_online(int cpu)
+{
+ return arch_test_bit(cpu, cpumask_bits(cpu_online_mask));
+}
+#else
+static __always_inline bool arch_cpu_online(int cpu)
+{
+ return cpu == 0;
+}
+#endif
+
+#define arch_cpu_is_offline(cpu) unlikely(!arch_cpu_online(cpu))
+#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
#if NR_CPUS <= BITS_PER_LONG
#define CPU_BITS_ALL \
next prev parent reply other threads:[~2020-06-03 11:42 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 11:40 [PATCH 0/9] x86/entry fixes Peter Zijlstra
2020-06-03 11:40 ` [PATCH 1/9] x86/entry: Fix irq_exit() Peter Zijlstra
2020-06-03 11:40 ` [PATCH 2/9] rcu: Fixup noinstr warnings Peter Zijlstra
2020-06-03 16:46 ` Paul E. McKenney
2020-06-03 17:13 ` Peter Zijlstra
2020-06-04 3:34 ` Paul E. McKenney
2020-06-04 6:02 ` Marco Elver
2020-06-04 14:14 ` Paul E. McKenney
2020-06-04 8:05 ` Peter Zijlstra
2020-06-04 14:17 ` Paul E. McKenney
2020-06-15 15:30 ` Peter Zijlstra
2020-06-15 15:52 ` Paul E. McKenney
2020-06-15 16:06 ` Peter Zijlstra
2020-06-15 15:49 ` Peter Zijlstra
2020-06-15 15:55 ` Peter Zijlstra
2020-06-15 16:24 ` Peter Zijlstra
2020-06-15 17:14 ` Paul E. McKenney
2020-06-15 18:33 ` Peter Zijlstra
2020-06-15 18:59 ` Paul E. McKenney
2020-06-15 20:00 ` Paul E. McKenney
2020-06-19 22:15 ` Paul E. McKenney
2020-06-23 20:46 ` Peter Zijlstra
2020-06-23 21:44 ` Paul E. McKenney
2020-06-24 7:52 ` Peter Zijlstra
2020-06-24 13:03 ` Paul E. McKenney
2020-06-03 11:40 ` [PATCH 3/9] x86/entry: __always_inline debugreg for noinstr Peter Zijlstra
2020-06-03 17:50 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-06-03 11:40 ` [PATCH 4/9] x86/entry: __always_inline irqflags " Peter Zijlstra
2020-06-03 17:50 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-06-03 11:40 ` [PATCH 5/9] x86/entry: __always_inline arch_atomic_* " Peter Zijlstra
2020-06-03 17:50 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-06-03 11:40 ` [PATCH 6/9] x86/entry: Re-order #DB handler to avoid *SAN instrumentation Peter Zijlstra
2020-06-03 17:50 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-06-03 11:40 ` [PATCH 7/9] lockdep: __always_inline more for noinstr Peter Zijlstra
2020-06-03 17:50 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-06-03 11:40 ` [PATCH 8/9] x86/entry: __always_inline CR2 " Peter Zijlstra
2020-06-03 17:50 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-06-03 11:40 ` Peter Zijlstra [this message]
2020-06-03 17:50 ` [tip: x86/entry] x86/entry, cpumask: Provide non-instrumented variant of cpu_is_offline() tip-bot2 for Peter Zijlstra
2020-06-03 12:00 ` [PATCH 0/9] x86/entry fixes Peter Zijlstra
2020-06-03 12:08 ` Peter Zijlstra
2020-06-03 12:08 ` Marco Elver
2020-06-03 12:18 ` Peter Zijlstra
2020-06-03 13:32 ` Marco Elver
2020-06-03 14:47 ` Marco Elver
2020-06-03 16:07 ` Peter Zijlstra
2020-06-03 17:26 ` Marco Elver
2020-06-03 18:16 ` Peter Zijlstra
2020-06-03 19:10 ` Marco Elver
2020-06-04 6:00 ` Marco Elver
2020-06-04 9:52 ` Marco Elver
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