From: Peter Zijlstra <peterz@infradead.org>
To: tglx@linutronix.de
Cc: x86@kernel.org, elver@google.com, paulmck@kernel.org,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
peterz@infradead.org, will@kernel.org, dvyukov@google.com,
glider@google.com, andreyknvl@google.com
Subject: [PATCH 1/8] x86, kcsan: Remove __no_kcsan_or_inline usage
Date: Thu, 04 Jun 2020 12:22:42 +0200 [thread overview]
Message-ID: <20200604102427.963062528@infradead.org> (raw)
In-Reply-To: 20200604102241.466509982@infradead.org
Now that KCSAN relies on -tsan-distinguish-volatile we no longer need
the annotation for constant_test_bit(). Remove it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/include/asm/bitops.h | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
--- a/arch/x86/include/asm/bitops.h
+++ b/arch/x86/include/asm/bitops.h
@@ -201,12 +201,8 @@ arch_test_and_change_bit(long nr, volati
return GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(btc), *addr, c, "Ir", nr);
}
-static __no_kcsan_or_inline bool constant_test_bit(long nr, const volatile unsigned long *addr)
+static __always_inline bool constant_test_bit(long nr, const volatile unsigned long *addr)
{
- /*
- * Because this is a plain access, we need to disable KCSAN here to
- * avoid double instrumentation via instrumented bitops.
- */
return ((1UL << (nr & (BITS_PER_LONG-1))) &
(addr[nr >> _BITOPS_LONG_SHIFT])) != 0;
}
next prev parent reply other threads:[~2020-06-04 10:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 10:22 [PATCH 0/8] x86/entry: KCSAN/KASAN/UBSAN vs noinstr Peter Zijlstra
2020-06-04 10:22 ` Peter Zijlstra [this message]
2020-06-04 10:22 ` [PATCH 2/8] kcsan: Remove __no_kcsan_or_inline Peter Zijlstra
2020-06-04 10:22 ` [PATCH 3/8] x86, kcsan: Add __no_kcsan to noinstr Peter Zijlstra
2020-06-04 10:22 ` [PATCH 4/8] kasan: Bump required compiler version Peter Zijlstra
2020-06-04 10:22 ` [PATCH 5/8] compiler_types.h: Add __no_sanitize_{address,undefined} to noinstr Peter Zijlstra
2020-06-04 10:22 ` [PATCH 6/8] x86/entry, cpumask: Provide non-instrumented variant of cpu_is_offline() Peter Zijlstra
2020-06-04 10:22 ` [PATCH 7/8] x86/entry, ubsan, objtool: Whitelist __ubsan_handle_*() Peter Zijlstra
2020-06-04 10:22 ` [PATCH 8/8] x86/entry, bug: Comment the instrumentation_begin() usage for WARN() Peter Zijlstra
2020-06-04 11:01 ` [PATCH 0/8] x86/entry: KCSAN/KASAN/UBSAN vs noinstr Marco Elver
2020-06-15 10:07 ` Marco Elver
2020-06-15 14:57 ` Qian Cai
2020-06-15 15:06 ` Peter Zijlstra
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