Re: [PATCH 3/3] [RFC] Revert "drm/i915: use variadic macros and arrays to choose port/pipe based registers"

From	Jani Nikula <jani.nikula@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 3/3] [RFC] Revert "drm/i915: use variadic macros and arrays to choose port/pipe based registers"
Date	2017-03-20 12:30 +0100
Message-ID	<tn3FE-3Z3-31@gated-at.bofh.it> (permalink)
References	<tn26R-2MC-7@gated-at.bofh.it> <tn26R-2MC-11@gated-at.bofh.it> <tn2qd-3a9-5@gated-at.bofh.it> <tn3cC-3xv-15@gated-at.bofh.it>
Organization	Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo

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On Mon, 20 Mar 2017, Arnd Bergmann <arnd@arndb.de> wrote:
> I don't know how to generate a URL for it, but after adding this to the
> command line for gcc-7,
>
> -fsanitize=kernel-address -fasan-shadow-offset=0xdfff900000000000
> --param asan-stack=1 --param asan-globals=1 --param
> asan-instrumentation-with-call-threshold=10000
> -fsanitize-address-use-after-scope
>
> the code turned from really nice into the log series of checks below.
> Without  -fsanitize-address-use-after-scope (which didn't exist before gcc-7),
> it's less bad but still exceeds the (arbitrary) 1536 byte limit.

It seems to be the combination of --param asan-stack=1 and
-fsanitize-address-use-after-scope that really blows up the code [1]. I
filed a GCC bug on it, mostly to see what they say [2]. I don't know,
maybe they think it's expected. *shrug*.


BR,
Jani.

[1] https://godbolt.org/g/hgS817
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80114


-- 
Jani Nikula, Intel Open Source Technology Center

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[PATCH 3/3] [RFC] Revert "drm/i915: use variadic macros and arrays to choose port/pipe based registers" Arnd Bergmann <arnd@arndb.de> - 2017-03-20 10:50 +0100
  Re: [PATCH 3/3] [RFC] Revert "drm/i915: use variadic macros and arrays to choose port/pipe based registers" Jani Nikula <jani.nikula@linux.intel.com> - 2017-03-20 11:10 +0100
    Re: [PATCH 3/3] [RFC] Revert "drm/i915: use variadic macros and  arrays to choose port/pipe based registers" Arnd Bergmann <arnd@arndb.de> - 2017-03-20 12:00 +0100
      Re: [PATCH 3/3] [RFC] Revert "drm/i915: use variadic macros and arrays to choose port/pipe based registers" Jani Nikula <jani.nikula@linux.intel.com> - 2017-03-20 12:30 +0100

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