linux-kernel - Re: [PATCH] riscv: compat_vdso: install compat_vdso.so.dbg to /lib/modules/*/vdso/

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Date: Mon, 18 Mar 2024 21:53:42 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: compat_vdso: install compat_vdso.so.dbg to
 /lib/modules/*/vdso/

Hi Masahiro,

On 15/03/2024 05:06, Masahiro Yamada wrote:
> On Thu, Mar 7, 2024 at 5:12 AM Alexandre Ghiti <alex@...ti.fr> wrote:
>> Hi Masahiro,
>>
>> On 24/02/2024 04:37, Masahiro Yamada wrote:
>>> Ping x 2 ?
>>>
>>>
>>>
>>>
>>>
>>> On Sun, Jan 21, 2024 at 6:48 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>>>> On Fri, Nov 17, 2023 at 9:58 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>>>>> 'make vdso_install' installs debug vdso files to /lib/modules/*/vdso/.
>>>>>
>>>>> Only for the compat vdso on riscv, the installation destination differs;
>>>>> compat_vdso.so.dbg is installed to /lib/module/*/compat_vdso/.
>>>>>
>>>>> To follow the standard install destination and simplify the vdso_install
>>>>> logic, change the install destination to standard /lib/modules/*/vdso/.
>>>>>
>>>>> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>>>>> ---
>>>> Ping?
>>>> (in case "yet more RISC-V updates" happens)
>>>>
>>>>
>>>>
>>>>
>>>>>    arch/riscv/Makefile | 2 +-
>>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
>>>>> index a74be78678eb..5cbe596345c1 100644
>>>>> --- a/arch/riscv/Makefile
>>>>> +++ b/arch/riscv/Makefile
>>>>> @@ -146,7 +146,7 @@ endif
>>>>>    endif
>>>>>
>>>>>    vdso-install-y                 += arch/riscv/kernel/vdso/vdso.so.dbg
>>>>> -vdso-install-$(CONFIG_COMPAT)  += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so
>>>>> +vdso-install-$(CONFIG_COMPAT)  += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg
>>>>>
>>>>>    ifneq ($(CONFIG_XIP_KERNEL),y)
>>>>>    ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
>>>>> --
>>>>> 2.40.1
>>>>>
>>>> --
>>>> Best Regards
>>>> Masahiro Yamada
>>>
>>> --
>>> Best Regards
>>> Masahiro Yamada
>>>
>>> _______________________________________________
>>> linux-riscv mailing list
>>> linux-riscv@...ts.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>>
>> Couldn't changing this library install path break some existing
>> application? I mean it kind of breaks where the library is expected to
>> be right?
>
> Do you have a particular library in mind?

None in particular.

>
>
> RISV-V is the only architecture that installs a debug vdso
> to a different location than the
> standard lib/modules/*/vdso/.
>
>
> I regard this as a fix.

You're probably right, I don't see why the search path would be 
different on riscv, unless it was fixed in userspace but I think this is 
the right thing to do, so:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex

>
>
>
>
>

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