The following commit has been merged into the x86/entry branch of tip: Commit-ID: 33aea07f30c261eff7ba229f19fd1b161e0fb851 Gitweb: https://git.kernel.org/tip/33aea07f30c261eff7ba229f19fd1b161e0fb851 Author: Marco Elver <elver@xxxxxxxxxx> AuthorDate: Tue, 16 Jun 2020 01:15:29 +02:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Tue, 16 Jun 2020 15:35:02 +02:00 compiler_attributes.h: Support no_sanitize_undefined check with GCC 4 UBSAN is supported since GCC 4.9, which unfortunately did not yet have __has_attribute(). To work around, the __GCC4_has_attribute workaround requires defining which compiler version supports the given attribute. In the case of no_sanitize_undefined, it is the first version that supports UBSAN, which is GCC 4.9. Reported-by: kernel test robot <lkp@xxxxxxxxx> Signed-off-by: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Reviewed-by: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx> Link: https://lkml.kernel.org/r/20200615231529.GA119644@xxxxxxxxxx --- include/linux/compiler_attributes.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h index cdf0165..c8f03d2 100644 --- a/include/linux/compiler_attributes.h +++ b/include/linux/compiler_attributes.h @@ -40,6 +40,7 @@ # define __GCC4_has_attribute___noclone__ 1 # define __GCC4_has_attribute___nonstring__ 0 # define __GCC4_has_attribute___no_sanitize_address__ (__GNUC_MINOR__ >= 8) +# define __GCC4_has_attribute___no_sanitize_undefined__ (__GNUC_MINOR__ >= 9) # define __GCC4_has_attribute___fallthrough__ 0 #endif
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