Re: [PATCH] x86_64: inline csum_ipv6_magic()

[Eric Dumazet]

On Thu, Nov 13, 2025 at 12:03 PM David Laight
<david.laight.linux@xxxxxxxxx> wrote:
>
> On Thu, 13 Nov 2025 10:18:08 -0800
> Eric Dumazet <edumazet@xxxxxxxxxx> wrote:
>
> > On Thu, Nov 13, 2025 at 8:26 AM Dave Hansen <dave.hansen@xxxxxxxxx> wrote:
> > >
> > > On 11/13/25 07:45, Eric Dumazet wrote:
> > > > Inline this small helper.
> > > >
> > > > This reduces register pressure, as saddr and daddr are often
> > > > back to back in memory.
> > > >
> > > > For instance code inlined in tcp6_gro_receive() will look like:
> > >
> > > Could you please double check what the code growth is for this across
> > > the tree? There are 80-ish users of csum_ipv6_magic().
> >
> > Hi Dave
> >
> > Sure (allyesconfig build)
>
> Does't allyesconfig pull in all the KASAN stuff as well.
> Which makes it fairly useless for normal build tests.

This is why I added a more standard build.

I do not think we have a "make allyesconfig_but_no_debug_stuff"

BTW, inlining rb_first() also saves 744 bytes.