linux-kernel - Re: [PATCH] LoongArch: vDSO: Remove --hash-style=sysv

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Message-ID: <f0c15994e7a79f6cd0c82930c0dfebb50458c941.camel@xry111.site>
Date: Fri, 21 Feb 2025 18:23:07 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Huacai Chen <chenhuacai@...nel.org>, Guo Ren <guoren@...nel.org>, Palmer
 Dabbelt <palmer@...belt.com>, Fangrui Song <i@...kray.me>
Cc: WANG Xuerui <kernel@...0n.name>, Masahiro Yamada <masahiroy@...nel.org>,
  Tiezhu Yang <yangtiezhu@...ngson.cn>, "Jason A. Donenfeld"
 <Jason@...c4.com>, loongarch@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-csky@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] LoongArch: vDSO: Remove --hash-style=sysv

On Fri, 2025-02-21 at 17:47 +0800, Huacai Chen wrote:
> Hi, Ruoyao,
> 
> On Fri, Feb 21, 2025 at 5:25 PM Xi Ruoyao <xry111@...111.site> wrote:
> > 
> > glibc added support for .gnu.hash in 2006 and .hash has been obsoleted
> > far before the first LoongArch CPU was taped.  Using
> > --hash-style=sysv might imply unaddressed issues and confuse readers.
> > 
> > In the past we really had an unaddressed issue: the vdso selftests did
> > not know how to process .gnu.hash.  But it has been addressed by commit
> > e0746bde6f82 ("selftests/vDSO: support DT_GNU_HASH") now.
> > 
> > Just drop the option and rely on the linker default, which is likely
> > "both" (AOSC) or "gnu" (Arch, Debian, Gentoo, LFS) on all LoongArch
> > distros.
> What about changing to "--hash-style=both" as most architectures do?

IMO we are more close to ARM64 for the aspect that there are no libc
(glibc or musl) releases lacking GNU hash support, so I prefer the ARM64
way.

Maybe this should be changed for some of other architectures (RISC-V and
C-SKY?) as well because I guess the only reason they used "both" was
"hey, without this the self tests don't work on Debian" but this is
resolved now.  Adding a few recipients and Cc for discussion.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University