[PATCH v4 8/9] loongarch: avoid orphan input sections

[陈华才]

OK, I think this is the root cause, but this patch is still worthy to go 6.0-rc4.

Huacai 


> -----原始邮件-----
> 发件人: "Xi Ruoyao" <xry111 at xry111.site>
> 发送时间:2022-08-28 17:44:24 (星期日)
> 收件人: "Ard Biesheuvel" <ardb at kernel.org>
> 抄送: "陈华才" <chenhuacai at loongson.cn>, linux-efi at vger.kernel.org, linux-arm-kernel at lists.infradead.org, "James
>  E.J. Bottomley" <James.Bottomley at hansenpartnership.com>, "Matthew Garrett" <mjg59 at srcf.ucam.org>, "Peter Jones" <pjones at redhat.com>, "Ilias Apalodimas" <ilias.apalodimas at linaro.org>, "Heinrich Schuchardt" <heinrich.schuchardt at canonical.com>, "AKASHI Takahiro" <takahiro.akashi at linaro.org>, "Palmer Dabbelt" <palmer at dabbelt.com>, "Atish
>  Patra" <atishp at atishpatra.org>, "Arnd Bergmann" <arnd at arndb.de>, "Lennart
>  Poettering" <lennart at poettering.net>, "Jeremy Linton" <jeremy.linton at arm.com>
> 主题: Re: [PATCH v4 8/9] loongarch: avoid orphan input sections
> 
> On Sun, 2022-08-28 at 11:36 +0200, Ard Biesheuvel wrote:
> > But does the ELF psABI for LoongArch describe L_ARCH_NONE as a dynamic
> > relocation? .rela.dyn typically only contains relocations that are
> > specified as being suitable for runtime relocation.
> 
> In Binutils 2.39 the BFD linker often over-estimate the size of .rela.*.
> For example if there is only 42 relocations, it may allocate the space
> for 47 relocations and fill the unused space in the section with zero. 
> Then 5 R_LARCH_NONE will appear.
> 
> This has already caused trouble when we reviewed LoongArch glibc port,
> but at last the reviewers considered using NONE relocations as a
> "padding" acceptable.  So in glibc ld.so will treat R_LARCH_NONE as a
> "dynamic" relocation with no real effect.
> 
> The issue (or "bug", if we want a more serious term) seems fixed in
> Binutils trunk, but I've not rebuilt the entire system with it so I'm
> not sure if it's completely fixed.
> 
> -- 
> Xi Ruoyao <xry111 at xry111.site>
> School of Aerospace Science and Technology, Xidian University


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