linux-kernel - Re: [PATCH V4 2/3] rust: Add PowerPC support

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Message-ID: <aYrBU52OBCgR-chY@li-1a3e774c-28e4-11b2-a85c-acc9f2883e29.ibm.com>
Date: Tue, 10 Feb 2026 10:57:44 +0530
From: Mukesh Kumar Chaurasiya <mkchauras@...il.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>, 
	linkmauve@...kmauve.fr, ojeda@...nel.org, boqun.feng@...il.com, gary@...yguo.net, 
	bjorn3_gh@...tonmail.com, lossin@...nel.org, a.hindborg@...nel.org, aliceryhl@...gle.com, 
	tmgross@...ch.edu, dakr@...nel.org, corbet@....net, maddy@...ux.ibm.com, 
	mpe@...erman.id.au, npiggin@...il.com, peterz@...radead.org, jpoimboe@...nel.org, 
	jbaron@...mai.com, rostedt@...dmis.org, ardb@...nel.org, 
	rust-for-linux@...r.kernel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V4 2/3] rust: Add PowerPC support

On Mon, Feb 09, 2026 at 01:48:01PM +0100, Miguel Ojeda wrote:
> On Mon, Feb 9, 2026 at 1:29 PM Christophe Leroy (CS GROUP)
> <chleroy@...nel.org> wrote:
> >
> > As far as I understand the patch is complete, the problem is outside the
> > kernel, it is in the libcore provided by rust or the rust compiler.
> >
> > That libcore seems to call __udivdi3() and __umoddi3() which are not
> > provided by the kernel. Instead if should call the functions do_div()
> > and friends provided by include/asm-generic/div64.h, or provide
> > __udivdi3() and __umoddi3() on its own.
> 
> Yeah, but what I mean is, should we add this if it doesn't link,
> especially without a note or comment of some kind? (Perhaps to your
> tracking issue in GitHub?)
> 
Hey,

I'll put this as a note in out rust support issue on github.


> i.e. if I understand correctly, you prefer to not add the panicking
> intrinsics to `rust/compiler_builtins.rs`, which I agree isn't ideal.
> By the way, it would be nice if IBM could join one of the meetings
> with have with upstream Rust to raise this topic again with them.
> 
Sure, i'll try to join the call and bring this up.

> In any case, it is up to you, of course. My only concern on the Rust
> bits is on the docs side, the rest looks fine.
> 
> Thanks!
> 
> Cheers,
> Miguel

Regards,
Mukesh