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Date: Mon, 20 May 2019 12:50:30 +0300 From: Andrey Ryabinin <aryabinin@...tuozzo.com> To: kernel test robot <rong.a.chen@...el.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, lkp@...org Subject: Re: [ubsan] f0996bc297: netperf.Throughput_total_tps -7.6% regression On 5/20/19 8:38 AM, kernel test robot wrote: > Greeting, > > FYI, we noticed a -7.6% regression of netperf.Throughput_total_tps due to commit: > > > commit: f0996bc2978e02d2ea898101462b960f6119b18f ("ubsan: Fix nasty -Wbuiltin-declaration-mismatch GCC-9 warnings") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > This can't be right. First of all the commit makes changes only lib/ubsan.c which is compiled only when CONFIG_UBSAN=y. In your config: # CONFIG_UBSAN is not set But even in the case of enabled UBSAN that commit doesn't change the generated machine code at all.
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