From: Mark Rutland <mark.rutland@arm.com>
To: Marco Elver <elver@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Alexander Potapenko <glider@google.com>,
Boqun Feng <boqun.feng@gmail.com>, Borislav Petkov <bp@alien8.de>,
Dmitry Vyukov <dvyukov@google.com>,
Ingo Molnar <mingo@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Waiman Long <longman@redhat.com>, Will Deacon <will@kernel.org>,
kasan-dev@googlegroups.com, linux-arch@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Subject: Re: [PATCH v2 02/23] kcsan: Remove redundant zero-initialization of globals
Date: Thu, 18 Nov 2021 11:09:31 +0000 [thread overview]
Message-ID: <20211118110931.GB5233@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <20211118081027.3175699-3-elver@google.com>
On Thu, Nov 18, 2021 at 09:10:06AM +0100, Marco Elver wrote:
> They are implicitly zero-initialized, remove explicit initialization.
> It keeps the upcoming additions to kcsan_ctx consistent with the rest.
>
> No functional change intended.
>
> Signed-off-by: Marco Elver <elver@google.com>
> ---
> init/init_task.c | 9 +--------
> kernel/kcsan/core.c | 5 -----
> 2 files changed, 1 insertion(+), 13 deletions(-)
>
> diff --git a/init/init_task.c b/init/init_task.c
> index 2d024066e27b..61700365ce58 100644
> --- a/init/init_task.c
> +++ b/init/init_task.c
> @@ -181,14 +181,7 @@ struct task_struct init_task
> .kasan_depth = 1,
> #endif
> #ifdef CONFIG_KCSAN
> - .kcsan_ctx = {
> - .disable_count = 0,
> - .atomic_next = 0,
> - .atomic_nest_count = 0,
> - .in_flat_atomic = false,
> - .access_mask = 0,
> - .scoped_accesses = {LIST_POISON1, NULL},
> - },
> + .kcsan_ctx = { .scoped_accesses = {LIST_POISON1, NULL} },
I'd recommend leaving this as:
.kcsan_ctx = {
.scoped_accesses = {LIST_POISON1, NULL},
},
... which'd be consistent with the DEFINE_PER_CPU() usage below, and
makes it easier to add fields to in future without needing structural
changes.
Either way:
Acked-by: Mark Rutland <mark.rutland@arm.com>
> #endif
> #ifdef CONFIG_TRACE_IRQFLAGS
> .softirqs_enabled = 1,
> diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
> index 6bfd3040f46b..e34a1710b7bc 100644
> --- a/kernel/kcsan/core.c
> +++ b/kernel/kcsan/core.c
> @@ -44,11 +44,6 @@ bool kcsan_enabled;
>
> /* Per-CPU kcsan_ctx for interrupts */
> static DEFINE_PER_CPU(struct kcsan_ctx, kcsan_cpu_ctx) = {
> - .disable_count = 0,
> - .atomic_next = 0,
> - .atomic_nest_count = 0,
> - .in_flat_atomic = false,
> - .access_mask = 0,
> .scoped_accesses = {LIST_POISON1, NULL},
> };
>
> --
> 2.34.0.rc2.393.gf8c9666880-goog
>
next prev parent reply other threads:[~2021-11-18 11:11 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-18 8:10 [PATCH v2 00/23] kcsan: Support detecting a subset of missing memory barriers Marco Elver
2021-11-18 8:10 ` [PATCH v2 01/23] kcsan: Refactor reading of instrumented memory Marco Elver
2021-11-18 11:08 ` Mark Rutland
2021-11-18 8:10 ` [PATCH v2 02/23] kcsan: Remove redundant zero-initialization of globals Marco Elver
2021-11-18 11:09 ` Mark Rutland [this message]
2021-11-18 8:10 ` [PATCH v2 03/23] kcsan: Avoid checking scoped accesses from nested contexts Marco Elver
2021-11-29 8:47 ` Boqun Feng
2021-11-29 10:57 ` Marco Elver
2021-11-29 14:26 ` Boqun Feng
2021-11-29 14:42 ` Marco Elver
2021-11-18 8:10 ` [PATCH v2 04/23] kcsan: Add core support for a subset of weak memory modeling Marco Elver
2021-11-18 8:10 ` [PATCH v2 05/23] kcsan: Add core memory barrier instrumentation functions Marco Elver
2021-11-18 8:10 ` [PATCH v2 06/23] kcsan, kbuild: Add option for barrier instrumentation only Marco Elver
2021-11-18 8:10 ` [PATCH v2 07/23] kcsan: Call scoped accesses reordered in reports Marco Elver
2021-11-18 8:10 ` [PATCH v2 08/23] kcsan: Show location access was reordered to Marco Elver
2021-11-18 8:10 ` [PATCH v2 09/23] kcsan: Document modeling of weak memory Marco Elver
2021-11-18 8:10 ` [PATCH v2 10/23] kcsan: test: Match reordered or normal accesses Marco Elver
2021-11-18 8:10 ` [PATCH v2 11/23] kcsan: test: Add test cases for memory barrier instrumentation Marco Elver
2021-11-18 8:10 ` [PATCH v2 12/23] kcsan: Ignore GCC 11+ warnings about TSan runtime support Marco Elver
2021-11-18 8:10 ` [PATCH v2 13/23] kcsan: selftest: Add test case to check memory barrier instrumentation Marco Elver
2021-11-18 8:10 ` [PATCH v2 14/23] locking/barriers, kcsan: Add instrumentation for barriers Marco Elver
2021-11-18 8:10 ` [PATCH v2 15/23] locking/barriers, kcsan: Support generic instrumentation Marco Elver
2021-11-18 8:10 ` [PATCH v2 16/23] locking/atomics, kcsan: Add instrumentation for barriers Marco Elver
2021-11-18 8:10 ` [PATCH v2 17/23] asm-generic/bitops, " Marco Elver
2021-11-18 8:10 ` [PATCH v2 18/23] x86/barriers, kcsan: Use generic instrumentation for non-smp barriers Marco Elver
2021-11-18 8:10 ` [PATCH v2 19/23] x86/qspinlock, kcsan: Instrument barrier of pv_queued_spin_unlock() Marco Elver
2021-11-18 8:10 ` [PATCH v2 20/23] mm, kcsan: Enable barrier instrumentation Marco Elver
2021-11-18 8:10 ` [PATCH v2 21/23] sched, kcsan: Enable memory " Marco Elver
2021-11-18 8:10 ` [PATCH v2 22/23] objtool, kcsan: Add memory barrier instrumentation to whitelist Marco Elver
2021-11-18 8:10 ` [PATCH v2 23/23] objtool, kcsan: Remove memory barrier instrumentation from noinstr Marco Elver
2021-11-19 20:31 ` Josh Poimboeuf
2021-11-19 21:31 ` Marco Elver
2021-11-23 11:29 ` Marco Elver
2021-11-24 17:53 ` Josh Poimboeuf
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