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Switching tracers include instruction patching. To prevent that a instruction is patched while it's read the instruction patching is done in stop_machine 'context'. This also means that any function called during stop_machine must not be traced. Thus add 'notrace' to all functions called within stop_machine. Fixes:1ec2772e0c("s390/diag: add a statistic for diagnose calls") Fixes:38f2c691a4("s390: improve wait logic of stop_machine") Fixes:4ecf0a43e7("processor: get rid of cpu_relax_yield") Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
34 lines
715 B
C
34 lines
715 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Tracepoint definitions for s390
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*
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* Copyright IBM Corp. 2015
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/percpu.h>
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#define CREATE_TRACE_POINTS
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#include <asm/trace/diag.h>
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EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
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static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
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void notrace trace_s390_diagnose_norecursion(int diag_nr)
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{
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unsigned long flags;
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unsigned int *depth;
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/* Avoid lockdep recursion. */
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if (IS_ENABLED(CONFIG_LOCKDEP))
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return;
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local_irq_save(flags);
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depth = this_cpu_ptr(&diagnose_trace_depth);
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if (*depth == 0) {
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(*depth)++;
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trace_s390_diagnose(diag_nr);
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(*depth)--;
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}
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local_irq_restore(flags);
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}
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