From: Marco Elver <elver@google.com> To: elver@google.com Cc: akiyks@gmail.com, stern@rowland.harvard.edu, glider@google.com, parri.andrea@gmail.com, andreyknvl@google.com, luto@kernel.org, ard.biesheuvel@linaro.org, arnd@arndb.de, boqun.feng@gmail.com, bp@alien8.de, dja@axtens.net, dlustig@nvidia.com, dave.hansen@linux.intel.com, dhowells@redhat.com, dvyukov@google.com, hpa@zytor.com, mingo@redhat.com, j.alglave@ucl.ac.uk, joel@joelfernandes.org, corbet@lwn.net, jpoimboe@redhat.com, luc.maranget@inria.fr, mark.rutland@arm.com, npiggin@gmail.com, paulmck@kernel.org, peterz@infradead.org, tglx@linutronix.de, will@kernel.org, edumazet@google.com, kasan-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org> Subject: [PATCH v4 02/10] include/linux/compiler.h: Introduce data_race(expr) macro Date: Thu, 14 Nov 2019 19:02:55 +0100 Message-ID: <20191114180303.66955-3-elver@google.com> (raw) In-Reply-To: <20191114180303.66955-1-elver@google.com> This introduces the data_race(expr) macro, which can be used to annotate expressions for purposes of (1) documenting, and (2) giving tooling such as KCSAN information about which data races are deemed "safe". More context: http://lkml.kernel.org/r/CAHk-=wg5CkOEF8DTez1Qu0XTEFw_oHhxN98bDnFqbY7HL5AB2g@mail.gmail.com Signed-off-by: Marco Elver <elver@google.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Eric Dumazet <edumazet@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@kernel.org> --- v4: * Introduce this patch to KCSAN series. --- include/linux/compiler.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index c42fa83f23fb..7d3e77781578 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -310,6 +310,26 @@ unsigned long read_word_at_a_time(const void *addr) __u.__val; \ }) +#include <linux/kcsan.h> + +/* + * data_race: macro to document that accesses in an expression may conflict with + * other concurrent accesses resulting in data races, but the resulting + * behaviour is deemed safe regardless. + * + * This macro *does not* affect normal code generation, but is a hint to tooling + * that data races here should be ignored. + */ +#define data_race(expr) \ + ({ \ + typeof(({ expr; })) __val; \ + kcsan_nestable_atomic_begin(); \ + __val = ({ expr; }); \ + kcsan_nestable_atomic_end(); \ + __val; \ + }) +#else + #endif /* __KERNEL__ */ /* -- 2.24.0.rc1.363.gb1bccd3e3d-goog
next prev parent reply index Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-14 18:02 [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN) Marco Elver 2019-11-14 18:02 ` [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure Marco Elver 2019-11-19 19:27 ` Qian Cai 2019-11-19 19:54 ` Marco Elver 2019-11-19 21:42 ` Qian Cai 2019-11-19 21:53 ` Marco Elver 2020-01-03 5:13 ` Qian Cai 2020-01-06 12:46 ` Marco Elver 2020-01-14 11:08 ` Qian Cai 2020-01-14 12:51 ` Marco Elver 2020-01-14 19:22 ` Paul E. McKenney 2020-01-14 20:30 ` Qian Cai 2020-01-14 21:34 ` Paul E. McKenney 2020-01-14 21:48 ` Qian Cai 2020-01-14 22:09 ` Paul E. McKenney 2019-11-14 18:02 ` Marco Elver [this message] 2019-11-14 18:02 ` [PATCH v4 03/10] kcsan: Add Documentation entry in dev-tools Marco Elver 2019-11-14 18:02 ` [PATCH v4 04/10] objtool, kcsan: Add KCSAN runtime functions to whitelist Marco Elver 2019-11-14 18:02 ` [PATCH v4 05/10] build, kcsan: Add KCSAN build exceptions Marco Elver 2019-11-14 18:02 ` [PATCH v4 06/10] seqlock, kcsan: Add annotations for KCSAN Marco Elver 2019-11-14 18:03 ` [PATCH v4 07/10] seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier Marco Elver 2019-11-14 18:03 ` [PATCH v4 08/10] asm-generic, kcsan: Add KCSAN instrumentation for bitops Marco Elver 2019-11-15 11:55 ` Marco Elver 2019-11-14 18:03 ` [PATCH v4 09/10] locking/atomics, kcsan: Add KCSAN instrumentation Marco Elver 2019-11-14 18:03 ` [PATCH v4 10/10] x86, kcsan: Enable KCSAN for x86 Marco Elver 2019-11-14 19:50 ` [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN) Paul E. McKenney 2019-11-14 21:33 ` Marco Elver 2019-11-14 22:15 ` Paul E. McKenney 2019-11-15 12:02 ` Marco Elver 2019-11-15 16:41 ` Paul E. McKenney 2019-11-15 17:14 ` Marco Elver 2019-11-15 20:43 ` Paul E. McKenney 2019-11-16 8:20 ` Marco Elver 2019-11-16 15:34 ` Paul E. McKenney 2019-11-16 18:09 ` Marco Elver 2019-11-16 18:28 ` Paul E. McKenney 2019-11-19 19:50 ` Qian Cai 2019-11-19 20:12 ` Qian Cai 2019-11-19 21:50 ` Marco Elver 2019-11-20 15:54 ` Marco Elver
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