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Date: Thu, 9 Nov 2017 11:03:45 +0000 From: Marc Zyngier <marc.zyngier@....com> To: AKASHI Takahiro <takahiro.akashi@...aro.org>, Mark Rutland <mark.rutland@....com>, Sami Tolvanen <samitolvanen@...gle.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Kees Cook <keescook@...omium.org>, LKML <linux-kernel@...r.kernel.org>, Greg Hackmann <ghackmann@...gle.com>, Matthias Kaehlcke <mka@...omium.org>, linux-arm-kernel@...ts.infradead.org, cdall@...aro.org, ard.biesheuvel@...aro.org Subject: Re: [PATCH 00/15] Add support for clang LTO On 09/11/17 10:54, AKASHI Takahiro wrote: > On Sat, Nov 04, 2017 at 02:13:04AM +0000, Mark Rutland wrote: >> On Fri, Nov 03, 2017 at 12:56:47PM -0700, Sami Tolvanen wrote: >>> On Fri, Nov 03, 2017 at 07:26:35PM +0000, Mark Rutland wrote: >>>> I guess that in Google you haven't tested on a platform with EL2 >>>> available? >>> >>> Correct. I'll look into this and include a fix in v2. Does this work on a >>> clang build without LTO? >> >> I saw this on v4.14-rc7, with patch 7 (-mno-implicit-float), but no other >> patches from this series (i.e. no LTO). > > > Add -fno-jump-tables to ccflags-y of arch/arm64/kvm/hyp/Makefile. > Without this option, clang generates a branch instruction (br x11) > to an absolute (EL1) virtual address. Instead of adding more compiler flags to the Makefile, is there any way to have that as a function attribute? Thanks, M. -- Jazz is not dead. It just smells funny...
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