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Message-ID: <b87631c8-aa36-b72d-64d7-9343ddeebdc3@intel.com>
Date: Fri, 26 Aug 2022 14:12:42 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Ian Rogers <irogers@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Darren Hart <dvhart@...radead.org>,
Davidlohr Bueso <dave@...olabs.net>,
André Almeida <andrealmeid@...lia.com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, Weiguo Li <liwg06@...mail.com>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Thomas Richter <tmricht@...ux.ibm.com>,
Ravi Bangoria <ravi.bangoria@....com>,
Dario Petrillo <dario.pk1@...il.com>,
Hewenliang <hewenliang4@...wei.com>,
yaowenbin <yaowenbin1@...wei.com>,
Wenyu Liu <liuwenyu7@...wei.com>,
Song Liu <songliubraving@...com>,
Andrii Nakryiko <andrii@...nel.org>,
Dave Marchevsky <davemarchevsky@...com>,
Leo Yan <leo.yan@...aro.org>,
Kim Phillips <kim.phillips@....com>,
Pavithra Gurushankar <gpavithrasha@...il.com>,
Alexandre Truong <alexandre.truong@....com>,
Quentin Monnet <quentin@...valent.com>,
William Cohen <wcohen@...hat.com>,
Andres Freund <andres@...razel.de>,
Martin Liška <mliska@...e.cz>,
Colin Ian King <colin.king@...el.com>,
James Clark <james.clark@....com>,
Fangrui Song <maskray@...gle.com>,
Stephane Eranian <eranian@...gle.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
Riccardo Mancini <rickyman7@...il.com>,
Andi Kleen <ak@...ux.intel.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Zechuan Chen <chenzechuan1@...wei.com>,
Jason Wang <wangborong@...rlc.com>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Remi Bernon <rbernon@...eweavers.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
bpf@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v3 15/18] perf mutex: Add thread safety annotations
On 24/08/22 18:38, Ian Rogers wrote:
> Add thread safety annotations to struct mutex so that when compiled with
> clang's -Wthread-safety warnings are generated for erroneous lock
> patterns. NO_THREAD_SAFETY_ANALYSIS is needed for
> mutex_lock/mutex_unlock as the analysis doesn't under pthread calls.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/util/mutex.c | 2 ++
> tools/perf/util/mutex.h | 72 ++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 69 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/util/mutex.c b/tools/perf/util/mutex.c
> index 892294ac1769..ec813093276d 100644
> --- a/tools/perf/util/mutex.c
> +++ b/tools/perf/util/mutex.c
> @@ -50,11 +50,13 @@ void mutex_destroy(struct mutex *mtx)
> }
>
> void mutex_lock(struct mutex *mtx)
> + NO_THREAD_SAFETY_ANALYSIS
> {
> CHECK_ERR(pthread_mutex_lock(&mtx->lock));
> }
>
> void mutex_unlock(struct mutex *mtx)
> + NO_THREAD_SAFETY_ANALYSIS
> {
> CHECK_ERR(pthread_mutex_unlock(&mtx->lock));
> }
> diff --git a/tools/perf/util/mutex.h b/tools/perf/util/mutex.h
> index c9e110a2b55e..48a2d87598f0 100644
> --- a/tools/perf/util/mutex.h
> +++ b/tools/perf/util/mutex.h
> @@ -5,11 +5,73 @@
> #include <pthread.h>
> #include <stdbool.h>
>
> +/*
> + * A function-like feature checking macro that is a wrapper around
> + * `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
> + * nonzero constant integer if the attribute is supported or 0 if not.
> + */
> +#ifdef __has_attribute
> +#define HAVE_ATTRIBUTE(x) __has_attribute(x)
> +#else
> +#define HAVE_ATTRIBUTE(x) 0
> +#endif
> +
> +
Multiple blank lines
> +#if HAVE_ATTRIBUTE(guarded_by) && HAVE_ATTRIBUTE(pt_guarded_by) && \
> + HAVE_ATTRIBUTE(lockable) && HAVE_ATTRIBUTE(exclusive_lock_function) && \
> + HAVE_ATTRIBUTE(exclusive_trylock_function) && HAVE_ATTRIBUTE(exclusive_locks_required) && \
> + HAVE_ATTRIBUTE(no_thread_safety_analysis)
> +
> +/* Documents if a shared field or global variable needs to be protected by a mutex. */
> +#define GUARDED_BY(x) __attribute__((guarded_by(x)))
> +
> +/*
> + * Documents if the memory location pointed to by a pointer should be guarded by
> + * a mutex when dereferencing the pointer.
> + */
> +#define PT_GUARDED_BY(x) __attribute__((pt_guarded_by(x)))
> +
> +/* Documents if a type is a lockable type. */
> +#define LOCKABLE __attribute__((capability("lockable")))
> +
> +/* Documents functions that acquire a lock in the body of a function, and do not release it. */
> +#define EXCLUSIVE_LOCK_FUNCTION(...) __attribute__((exclusive_lock_function(__VA_ARGS__)))
> +
> +/*
> + * Documents functions that expect a lock to be held on entry to the function,
> + * and release it in the body of the function.
> + */
> +#define UNLOCK_FUNCTION(...) __attribute__((unlock_function(__VA_ARGS__)))
> +
> +/* Documents functions that try to acquire a lock, and return success or failure. */
> +#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
> + __attribute__((exclusive_trylock_function(__VA_ARGS__)))
> +
> +
Multiple blank lines
> +/* Documents a function that expects a mutex to be held prior to entry. */
> +#define EXCLUSIVE_LOCKS_REQUIRED(...) __attribute__((exclusive_locks_required(__VA_ARGS__)))
> +
> +/* Turns off thread safety checking within the body of a particular function. */
> +#define NO_THREAD_SAFETY_ANALYSIS __attribute__((no_thread_safety_analysis))
> +
> +#else
> +
> +#define GUARDED_BY(x)
> +#define PT_GUARDED_BY(x)
> +#define LOCKABLE
> +#define EXCLUSIVE_LOCK_FUNCTION(...)
> +#define UNLOCK_FUNCTION(...)
> +#define EXCLUSIVE_TRYLOCK_FUNCTION(...)
> +#define EXCLUSIVE_LOCKS_REQUIRED(...)
> +#define NO_THREAD_SAFETY_ANALYSIS
> +
> +#endif
> +
> /*
> * A wrapper around the mutex implementation that allows perf to error check
> * usage, etc.
> */
> -struct mutex {
> +struct LOCKABLE mutex {
> pthread_mutex_t lock;
> };
>
> @@ -27,9 +89,9 @@ void mutex_init(struct mutex *mtx);
> void mutex_init_pshared(struct mutex *mtx);
> void mutex_destroy(struct mutex *mtx);
>
> -void mutex_lock(struct mutex *mtx);
> -void mutex_unlock(struct mutex *mtx);
> -bool mutex_trylock(struct mutex *mtx);
> +void mutex_lock(struct mutex *mtx) EXCLUSIVE_LOCK_FUNCTION(*mtx);
> +void mutex_unlock(struct mutex *mtx) UNLOCK_FUNCTION(*mtx);
> +bool mutex_trylock(struct mutex *mtx) EXCLUSIVE_TRYLOCK_FUNCTION(true, *mtx);
>
> /* Default initialize the cond struct. */
> void cond_init(struct cond *cnd);
> @@ -40,7 +102,7 @@ void cond_init(struct cond *cnd);
> void cond_init_pshared(struct cond *cnd);
> void cond_destroy(struct cond *cnd);
>
> -void cond_wait(struct cond *cnd, struct mutex *mtx);
> +void cond_wait(struct cond *cnd, struct mutex *mtx) EXCLUSIVE_LOCKS_REQUIRED(mtx);
> void cond_signal(struct cond *cnd);
> void cond_broadcast(struct cond *cnd);
>
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