linux-kernel - Re: [PATCH 03/11] s390: vmlinux.lds.S: Explicitly handle '.got' and '.plt' sections

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Message-ID: <20240214122055.6438-D-hca@linux.ibm.com>
Date: Wed, 14 Feb 2024 13:20:55 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Fangrui Song <maskray@...gle.com>
Cc: Nathan Chancellor <nathan@...nel.org>, gor@...ux.ibm.com,
        agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        ndesaulniers@...gle.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        patches@...ts.linux.dev
Subject: Re: [PATCH 03/11] s390: vmlinux.lds.S: Explicitly handle '.got' and
 '.plt' sections

On Mon, Feb 12, 2024 at 09:31:53PM -0800, Fangrui Song wrote:
> On Wed, Feb 7, 2024 at 4:15 PM Nathan Chancellor <nathan@...nel.org> wrote:
> > +       ASSERT(SIZEOF(.got.plt) == 0, "Unexpected GOT/PLT entries detected!")
> > +       .plt : {
> > +               *(.plt)
> > +               *(.plt.*)
> > +               *(.iplt)
> > +               *(.igot .igot.plt)
> > +       }
> > +       ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
> > +
> 
> It seems that arches that drop .plt typically place input section
> description on one line. This saves vertical space.
> It's shorter to use one input section description to match multiple
> sections, e.g.
> 
>     *(.plt .iplt)

Yes, I'll change Nathan's patch so it looks like arm64:

	/*
	 * Sections that should stay zero sized, which is safer to
	 * explicitly check instead of blindly discarding.
	 */
	.plt : {
		*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
	}