linux-kernel - Re: [PATCH 5/8] kcsan: Test support for compound instrumentation

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Message-ID: <20200721110602.GA3311326@elver.google.com>
Date:   Tue, 21 Jul 2020 13:06:02 +0200
From:   Marco Elver <elver@...gle.com>
To:     paulmck@...nel.org
Cc:     will@...nel.org, peterz@...radead.org, arnd@...db.de,
        mark.rutland@....com, dvyukov@...gle.com, glider@...gle.com,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 5/8] kcsan: Test support for compound instrumentation

On Tue, Jul 21, 2020 at 12:30PM +0200, Marco Elver wrote:
[...]
> diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
> index 3d282d51849b..cde5b62b0a01 100644
> --- a/lib/Kconfig.kcsan
> +++ b/lib/Kconfig.kcsan
> @@ -40,6 +40,11 @@ menuconfig KCSAN
>  
>  if KCSAN
>  
> +# Compiler capabilities that should not fail the test if they are unavailable.
> +config CC_HAS_TSAN_COMPOUND_READ_BEFORE_WRITE
> +	def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-compound-read-before-write=1)) || \
> +		 (CC_IS_GCC && $(cc-option,-fsanitize=thread --param -tsan-compound-read-before-write=1))
> +
>  config KCSAN_VERBOSE
>  	bool "Show verbose reports with more information about system state"
>  	depends on PROVE_LOCKING

Ah, darn, one too many '-' on the CC_IS_GCC line.

	s/--param -tsan/--param tsan/

Below is what this chunk should have been. Not
that it matters right now, because GCC doesn't have this option
(although I hope it gains it eventually).

Paul, if you prefer v2 of the series with the fix, please let me know.
(In case there aren't more things to fix.)

Thanks,
-- Marco

------ >8 ------

diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index 3d282d51849b..f271ff5fbb5a 100644
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -40,6 +40,11 @@ menuconfig KCSAN
 
 if KCSAN
 
+# Compiler capabilities that should not fail the test if they are unavailable.
+config CC_HAS_TSAN_COMPOUND_READ_BEFORE_WRITE
+	def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-compound-read-before-write=1)) || \
+		 (CC_IS_GCC && $(cc-option,-fsanitize=thread --param tsan-compound-read-before-write=1))
+
 config KCSAN_VERBOSE
 	bool "Show verbose reports with more information about system state"
 	depends on PROVE_LOCKING