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From: Marco Elver <elver@google.com>
To: elver@google.com
Cc: paulmck@kernel.org, dvyukov@google.com, glider@google.com,
	andreyknvl@google.com, kasan-dev@googlegroups.com,
	linux-kernel@vger.kernel.org, tglx@linutronix.de,
	mingo@kernel.org, peterz@infradead.org, will@kernel.org,
	clang-built-linux@googlegroups.com, bp@alien8.de
Subject: [PATCH -tip v3 11/11] compiler_types.h, kasan: Use __SANITIZE_ADDRESS__ instead of CONFIG_KASAN to decide inlining
Date: Thu, 21 May 2020 16:20:47 +0200	[thread overview]
Message-ID: <20200521142047.169334-12-elver@google.com> (raw)
In-Reply-To: <20200521142047.169334-1-elver@google.com>

Like is done for KCSAN, for KASAN we should also use __always_inline in
compilation units that have instrumentation disabled
(KASAN_SANITIZE_foo.o := n). Adds common documentation for KASAN and
KCSAN explaining the attribute.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Marco Elver <elver@google.com>
---
 include/linux/compiler_types.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index b190a12e7089..5faf68eae204 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -167,7 +167,14 @@ struct ftrace_likely_data {
  */
 #define noinline_for_stack noinline
 
-#ifdef CONFIG_KASAN
+/*
+ * Sanitizer helper attributes: Because using __always_inline and
+ * __no_sanitize_* conflict, provide helper attributes that will either expand
+ * to __no_sanitize_* in compilation units where instrumentation is enabled
+ * (__SANITIZE_*__), or __always_inline in compilation units without
+ * instrumentation (__SANITIZE_*__ undefined).
+ */
+#ifdef __SANITIZE_ADDRESS__
 /*
  * We can't declare function 'inline' because __no_sanitize_address conflicts
  * with inlining. Attempt to inline it may cause a build failure.
@@ -182,10 +189,6 @@ struct ftrace_likely_data {
 
 #define __no_kcsan __no_sanitize_thread
 #ifdef __SANITIZE_THREAD__
-/*
- * Rely on __SANITIZE_THREAD__ instead of CONFIG_KCSAN, to avoid not inlining in
- * compilation units where instrumentation is disabled.
- */
 # define __no_kcsan_or_inline __no_kcsan notrace __maybe_unused
 # define __no_sanitize_or_inline __no_kcsan_or_inline
 #else
-- 
2.26.2.761.g0e0b3e54be-goog


  parent reply	other threads:[~2020-05-21 14:22 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-21 14:20 [PATCH -tip v3 00/11] Fix KCSAN for new ONCE (require Clang 11) Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 01/11] ubsan, kcsan: don't combine sanitizer with kcov on clang Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 02/11] kcsan: Avoid inserting __tsan_func_entry/exit if possible Marco Elver
2020-05-22 16:08   ` [tip: locking/kcsan] " tip-bot2 for Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 03/11] kcsan: Support distinguishing volatile accesses Marco Elver
2020-05-22 10:26   ` Borislav Petkov
2020-05-22 10:34     ` Marco Elver
2020-05-22 10:47       ` Borislav Petkov
2020-05-22 16:08   ` [tip: locking/kcsan] " tip-bot2 for Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 04/11] kcsan: Pass option tsan-instrument-read-before-write to Clang Marco Elver
2020-05-22 16:08   ` [tip: locking/kcsan] " tip-bot2 for Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 05/11] kcsan: Remove 'noinline' from __no_kcsan_or_inline Marco Elver
2020-05-29 17:07   ` Peter Zijlstra
2020-05-29 18:36     ` Marco Elver
2020-05-29 18:59       ` Peter Zijlstra
2020-05-21 14:20 ` [PATCH -tip v3 06/11] kcsan: Restrict supported compilers Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 07/11] kcsan: Update Documentation to change " Marco Elver
2020-05-22 16:08   ` [tip: locking/kcsan] " tip-bot2 for Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 08/11] READ_ONCE, WRITE_ONCE: Remove data_race() and unnecessary checks Marco Elver
2020-05-22 16:08   ` [tip: locking/kcsan] compiler.h: Remove data_race() and unnecessary checks from {READ,WRITE}_ONCE() tip-bot2 for Marco Elver
2020-05-21 14:20 ` [PATCH -tip v3 09/11] data_race: Avoid nested statement expression Marco Elver
2020-05-21 20:21   ` Nick Desaulniers
2020-05-26 10:42     ` Arnd Bergmann
2020-05-26 12:02       ` Will Deacon
2020-05-26 12:19         ` Arnd Bergmann
2020-05-26 13:12           ` Marco Elver
2020-05-26 17:33             ` Marco Elver
2020-05-26 19:00               ` Arnd Bergmann
2020-05-26 23:10                 ` Arnd Bergmann
2020-05-27  7:22                   ` Will Deacon
2020-05-27  7:44                     ` Marco Elver
2020-05-27  9:26                       ` Arnd Bergmann
2020-05-28 12:53                         ` Stephen Rothwell
2020-05-26 21:36               ` Peter Zijlstra
2020-05-21 14:20 ` [PATCH -tip v3 10/11] compiler.h: Move function attributes to compiler_types.h Marco Elver
2020-05-22 16:08   ` [tip: locking/kcsan] " tip-bot2 for Marco Elver
2020-05-21 14:20 ` Marco Elver [this message]
2020-05-22 16:08   ` [tip: locking/kcsan] compiler_types.h, kasan: Use __SANITIZE_ADDRESS__ instead of CONFIG_KASAN to decide inlining tip-bot2 for Marco Elver
2020-05-22 11:35 ` [PATCH -tip v3 00/11] Fix KCSAN for new ONCE (require Clang 11) Peter Zijlstra

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