linux-kernel - Re: [RFC PATCH 0/9] nolibc: Add static-pie support

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Message-ID: <aX_KVT8hLjPPV_zQ@1wt.eu>
Date: Sun, 1 Feb 2026 22:49:09 +0100
From: Willy Tarreau <w@....eu>
To: Daniel Palmer <daniel@...ngy.jp>
Cc: linux@...ssschuh.net, kees@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/9] nolibc: Add static-pie support

On Mon, Feb 02, 2026 at 06:45:40AM +0900, Daniel Palmer wrote:
> Hi Willy,
> 
> On Mon, 2 Feb 2026 at 03:14, Willy Tarreau <w@....eu> wrote:
> >   $ diff -u ret0*size
> >   --- ret0-6.19-rc7.size  2026-02-01 19:04:33.918536545 +0100
> >   +++ ret0-daniel.size    2026-02-01 19:04:40.914761767 +0100
> >   @@ -16,4 +16,5 @@
> >    0000000000000011 W raise
> >    0000000000000012 W abort
> >    0000000000000023 W memmove
> >   -0000000000000098 W _start_c
> >   +0000000000000086 W __start_c
> >   +000000000000015f W _start_c
> >
> > The delta is indeed 333 bytes.
> >
> > Is there anything we could detect at build time to detect that we want to
> > go the heavy way ? Maybe we should only condition that code to __PIE__ ?
> > There's nothing critical, it's really about having an open discussion on
> > this, because we're trying to keep the minimal binaries small, and here
> > we're just doubling the size of the smallest ones all the time.
> >
> > Thanks!
> > Willy
> 
> Thank you for the feedback. I'll work out a way of hiding all of the
> new code unless it's needed.
> I think there might still be some increase in size from splitting
> _start_c() into two parts though.

Yes but that's expected. We can spend a few bytes here and there for the
good cause, it's just that here there's an opportunity to avoid most of
them when not needed.

Thanks,
Willy