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Subject: Re: [PATCH 00/15] Add support for clang LTO
To: AKASHI Takahiro <takahiro.akashi@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Sami Tolvanen <samitolvanen@google.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
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From: Marc Zyngier <marc.zyngier@arm.com>
Organization: ARM Ltd
Message-ID: <868353d9-5972-c6e8-02ed-6f9010c3e40f@arm.com>
Date: Thu, 9 Nov 2017 11:03:45 +0000
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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...