linux-kernel - Re: [PATCH] arm64: vdso: Explicitly add build-id option

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Date:   Thu, 16 May 2019 06:16:26 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Will Deacon <will.deacon@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: vdso: Explicitly add build-id option

On 5/16/19 3:46 AM, Will Deacon wrote:
> On Thu, May 16, 2019 at 01:58:56PM +0900, Masahiro Yamada wrote:
>> On Thu, May 16, 2019 at 4:51 AM Laura Abbott <labbott@...hat.com> wrote:
>>>
>>> Commit 691efbedc60d ("arm64: vdso: use $(LD) instead of $(CC) to
>>> link VDSO") switched to using LD explicitly. The --build-id option
>>> needs to be passed explicitly, similar to x86. Add this option.
>>>
>>> Fixes: 691efbedc60d ("arm64: vdso: use $(LD) instead of $(CC) to link VDSO")
>>> Signed-off-by: Laura Abbott <labbott@...hat.com>
>>> ---
>>>   arch/arm64/kernel/vdso/Makefile | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
>>> index 744b9dbaba03..ca209103cd06 100644
>>> --- a/arch/arm64/kernel/vdso/Makefile
>>> +++ b/arch/arm64/kernel/vdso/Makefile
>>> @@ -13,6 +13,7 @@ targets := $(obj-vdso) vdso.so vdso.so.dbg
>>>   obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
>>>
>>>   ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 \
>>> +               $(call ld-option, --build-id) \
>>>                  $(call ld-option, --hash-style=sysv) -n -T
>>>
>>>   # Disable gcov profiling for VDSO code
>>
>>
>> I missed that. Sorry.
>>
>> You can add  --build-id without $(call ld-option,...)
>> because it is supported by our minimal version of toolchain.
>>
>> See commit log of 1e0221374e for example.
> 
> Ok, so I'm ok folding in the diff below on top?
> 
> Will
> 
> --->8
> 
> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
> index ca209103cd06..fa230ff09aa1 100644
> --- a/arch/arm64/kernel/vdso/Makefile
> +++ b/arch/arm64/kernel/vdso/Makefile
> @@ -12,9 +12,8 @@ obj-vdso := gettimeofday.o note.o sigreturn.o
>   targets := $(obj-vdso) vdso.so vdso.so.dbg
>   obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
>   
> -ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 \
> -		$(call ld-option, --build-id) \
> -		$(call ld-option, --hash-style=sysv) -n -T
> +ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
> +		--build-id -n -T
>   
>   # Disable gcov profiling for VDSO code
>   GCOV_PROFILE := n
> 

Looks good to me.

Thanks,
Laura