forked from mirrors/linux
d090ec0df8
call_single_data_t is a size-aligned typedef of struct __call_single_data.
This alignment is desirable in order to have smp_call_function*() avoid
bouncing an extra cacheline in case of an unaligned csd, given this
would hurt performance.
Since the removal of struct request->csd in commit 660e802c76
("blk-mq: use percpu csd to remote complete instead of per-rq csd") there
are no current users of smp_call_function*() with unaligned csd.
Change every 'struct __call_single_data' function parameter to
'call_single_data_t', so we have warnings if any new code tries to
introduce an smp_call_function*() call with unaligned csd.
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230831063129.335425-1-leobras@redhat.com
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM csd
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#if !defined(_TRACE_CSD_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_CSD_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(csd_queue_cpu,
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TP_PROTO(const unsigned int cpu,
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unsigned long callsite,
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smp_call_func_t func,
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call_single_data_t *csd),
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TP_ARGS(cpu, callsite, func, csd),
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TP_STRUCT__entry(
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__field(unsigned int, cpu)
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__field(void *, callsite)
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__field(void *, func)
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__field(void *, csd)
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),
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TP_fast_assign(
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__entry->cpu = cpu;
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__entry->callsite = (void *)callsite;
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__entry->func = func;
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__entry->csd = csd;
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),
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TP_printk("cpu=%u callsite=%pS func=%ps csd=%p",
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__entry->cpu, __entry->callsite, __entry->func, __entry->csd)
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);
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/*
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* Tracepoints for a function which is called as an effect of smp_call_function.*
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*/
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DECLARE_EVENT_CLASS(csd_function,
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TP_PROTO(smp_call_func_t func, call_single_data_t *csd),
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TP_ARGS(func, csd),
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TP_STRUCT__entry(
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__field(void *, func)
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__field(void *, csd)
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),
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TP_fast_assign(
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__entry->func = func;
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__entry->csd = csd;
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),
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TP_printk("func=%ps, csd=%p", __entry->func, __entry->csd)
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);
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DEFINE_EVENT(csd_function, csd_function_entry,
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TP_PROTO(smp_call_func_t func, call_single_data_t *csd),
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TP_ARGS(func, csd)
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);
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DEFINE_EVENT(csd_function, csd_function_exit,
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TP_PROTO(smp_call_func_t func, call_single_data_t *csd),
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TP_ARGS(func, csd)
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);
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#endif /* _TRACE_CSD_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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