On Sat, 30 Jun 2018 11:07:20 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Sat, 30 Jun 2018 12:27:09 +0200 Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > > head: 1904148a361a07fb2d7cba1261d1d2c2f33c8d2e > > > commit: 758517202bd2e427664857c9f2aa59da36848aca arm: port KCOV to arm > > > date: 2 weeks ago > > > config: arm-allmodconfig (attached as .config) > > > compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0 > > > reproduce: > > > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > > > chmod +x ~/bin/make.cross > > > git checkout 758517202bd2e427664857c9f2aa59da36848aca > > > # save the attached .config to linux build tree > > > GCC_VERSION=7.2.0 make.cross ARCH=arm > > > > > > All errors (new ones prefixed by >>): > > > > > > /tmp/cctnQ1CM.s: Assembler messages: > > >>> /tmp/cctnQ1CM.s:35: Error: .err encountered > > > /tmp/cctnQ1CM.s:36: Error: .err encountered > > > /tmp/cctnQ1CM.s:37: Error: .err encountered > > > > Hi kbuild test robot, > > > > The fix was mailed more than a month ago, but still not merged into > > the tree. That's linux... > > That was a rather unhelpful email. > > I've just scanned all your lkml emails since the start of May and > cannot find anything which looks like a fix for this issue. > > Please resend. About three weks ago :( OK, with a bi of amazing sleuthing I found this from Arnd, which is what I presume you're referring to? From: Arnd Bergmann <arnd@xxxxxxxx> Subject: ARM: disable KCOV for trusted foundations code The ARM trusted foundations code is currently broken in linux-next when CONFIG_KCOV_INSTRUMENT_ALL is set: /tmp/ccHdQsCI.s: Assembler messages: /tmp/ccHdQsCI.s:37: Error: .err encountered /tmp/ccHdQsCI.s:38: Error: .err encountered /tmp/ccHdQsCI.s:39: Error: .err encountered scripts/Makefile.build:311: recipe for target 'arch/arm/firmware/trusted_foundations.o' failed I could not find a function attribute that lets me disable -fsanitize-coverage=trace-pc for just one function, so this turns it off for the entire file instead. Link: http://lkml.kernel.org/r/20180529103636.1535457-1-arnd@xxxxxxxx Fixes: 758517202bd2e4 ("arm: port KCOV to arm") Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- diff -puN arch/arm/firmware/Makefile~arm-disable-kcov-for-trusted-foundations-code arch/arm/firmware/Makefile --- a/arch/arm/firmware/Makefile~arm-disable-kcov-for-trusted-foundations-code +++ a/arch/arm/firmware/Makefile @@ -1 +1,4 @@ obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o + +# tf_generic_smc() fails to build with -fsanitize-coverage=trace-pc +KCOV_INSTRUMENT := n _
