Messages in this thread | | | Date | Wed, 26 May 2021 10:19:04 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] kcov: add __no_sanitize_coverage to fix noinstr for all architectures |
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On Tue, May 25, 2021 at 07:58:19PM +0200, Marco Elver wrote: > Until now no compiler supported an attribute to disable coverage > instrumentation as used by KCOV. > > To work around this limitation on x86, noinstr functions have their > coverage instrumentation turned into nops by objtool. However, this > solution doesn't scale automatically to other architectures, such as > arm64, which are migrating to use the generic entry code. > > Clang [1] and GCC [2] have added support for the attribute recently. > [1] https://github.com/llvm/llvm-project/commit/280333021e9550d80f5c1152a34e33e81df1e178 > [2] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=cec4d4a6782c9bd8d071839c50a239c49caca689 > > Add __no_sanitize_coverage for both compilers, and add it to noinstr. > > Signed-off-by: Marco Elver <elver@google.com>
W00t! Thanks guys!
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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