mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 16:46:52 +07:00
098507ae3e
The replacement of the 'count' variable by two variables 'incs' and
'decs' to resolve some race conditions during module unloading was done
in parallel with some cleanup in the trace subsystem, and was integrated
as a merge.
Unfortunately, the formula for this replacement was wrong in the tracing
code, and the refcount in the traces was not usable as a result.
Use 'count = incs - decs' to compute the user count.
Link: http://lkml.kernel.org/p/1393924179-9147-1-git-send-email-romain.izard.pro@gmail.com
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: stable@vger.kernel.org # 2.6.35
Fixes: c1ab9cab75 "merge conflict resolution"
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
/*
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* Because linux/module.h has tracepoints in the header, and ftrace.h
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* used to include this file, define_trace.h includes linux/module.h
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* But we do not want the module.h to override the TRACE_SYSTEM macro
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* variable that define_trace.h is processing, so we only set it
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* when module events are being processed, which would happen when
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* CREATE_TRACE_POINTS is defined.
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*/
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#ifdef CREATE_TRACE_POINTS
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM module
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#endif
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#if !defined(_TRACE_MODULE_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_MODULE_H
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#include <linux/tracepoint.h>
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#ifdef CONFIG_MODULES
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struct module;
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#define show_module_flags(flags) __print_flags(flags, "", \
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{ (1UL << TAINT_PROPRIETARY_MODULE), "P" }, \
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{ (1UL << TAINT_OOT_MODULE), "O" }, \
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{ (1UL << TAINT_FORCED_MODULE), "F" }, \
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{ (1UL << TAINT_CRAP), "C" }, \
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{ (1UL << TAINT_UNSIGNED_MODULE), "X" })
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TRACE_EVENT(module_load,
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TP_PROTO(struct module *mod),
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TP_ARGS(mod),
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TP_STRUCT__entry(
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__field( unsigned int, taints )
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__string( name, mod->name )
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),
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TP_fast_assign(
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__entry->taints = mod->taints;
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__assign_str(name, mod->name);
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),
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TP_printk("%s %s", __get_str(name), show_module_flags(__entry->taints))
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);
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TRACE_EVENT(module_free,
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TP_PROTO(struct module *mod),
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TP_ARGS(mod),
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TP_STRUCT__entry(
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__string( name, mod->name )
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),
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TP_fast_assign(
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__assign_str(name, mod->name);
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),
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TP_printk("%s", __get_str(name))
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);
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#ifdef CONFIG_MODULE_UNLOAD
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/* trace_module_get/put are only used if CONFIG_MODULE_UNLOAD is defined */
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DECLARE_EVENT_CLASS(module_refcnt,
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TP_PROTO(struct module *mod, unsigned long ip),
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TP_ARGS(mod, ip),
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TP_STRUCT__entry(
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__field( unsigned long, ip )
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__field( int, refcnt )
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__string( name, mod->name )
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),
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TP_fast_assign(
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__entry->ip = ip;
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__entry->refcnt = __this_cpu_read(mod->refptr->incs) - __this_cpu_read(mod->refptr->decs);
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__assign_str(name, mod->name);
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),
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TP_printk("%s call_site=%pf refcnt=%d",
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__get_str(name), (void *)__entry->ip, __entry->refcnt)
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);
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DEFINE_EVENT(module_refcnt, module_get,
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TP_PROTO(struct module *mod, unsigned long ip),
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TP_ARGS(mod, ip)
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);
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DEFINE_EVENT(module_refcnt, module_put,
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TP_PROTO(struct module *mod, unsigned long ip),
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TP_ARGS(mod, ip)
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);
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#endif /* CONFIG_MODULE_UNLOAD */
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TRACE_EVENT(module_request,
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TP_PROTO(char *name, bool wait, unsigned long ip),
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TP_ARGS(name, wait, ip),
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TP_STRUCT__entry(
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__field( unsigned long, ip )
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__field( bool, wait )
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__string( name, name )
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),
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TP_fast_assign(
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__entry->ip = ip;
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__entry->wait = wait;
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__assign_str(name, name);
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),
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TP_printk("%s wait=%d call_site=%pf",
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__get_str(name), (int)__entry->wait, (void *)__entry->ip)
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);
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#endif /* CONFIG_MODULES */
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#endif /* _TRACE_MODULE_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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