Re: [PATCH 6.12.y] rust: kbuild: support `-Cjump-tables=n` for Rust 1.93.0

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Jan 29, 2026 at 04:03:06PM +0100, Miguel Ojeda wrote:
> On Thu, Jan 29, 2026 at 3:55 PM Miguel Ojeda
> <miguel.ojeda.sandonis@gmail.com> wrote:
> >
> > On Thu, Jan 29, 2026 at 2:37 PM Alyssa Ross <hi@alyssa.is> wrote:
> > >
> > > From: Miguel Ojeda <ojeda@kernel.org>
> > >
> > > Rust 1.93.0 (expected 2026-01-22) is stabilizing `-Zno-jump-tables`
> > > [1][2] as `-Cjump-tables=n` [3].
> > >
> > > Without this change, one would eventually see:
> > >
> > >       RUSTC L rust/core.o
> > >     error: unknown unstable option: `no-jump-tables`
> > >
> > > Thus support the upcoming version.
> > >
> > > Link: https://github.com/rust-lang/rust/issues/116592 [1]
> > > Link: https://github.com/rust-lang/rust/pull/105812 [2]
> > > Link: https://github.com/rust-lang/rust/pull/145974 [3]
> > > Reviewed-by: Alice Ryhl <aliceryhl@google.com>
> > > Reviewed-by: Trevor Gross <tmgross@umich.edu>
> > > Acked-by: Nicolas Schier <nsc@kernel.org>
> > > Link: https://patch.msgid.link/20251101094011.1024534-1-ojeda@kernel.org
> > > Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> > > (cherry picked from commit 789521b4717fd6bd85164ba5c131f621a79c9736)
> > > Signed-off-by: Alyssa Ross <hi@alyssa.is>
> >
> > Thanks!
> >
> > Greg, Sasha: yes, please take this one -- this commit should have had:
> >
> >   Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is
> > pinned in older LTSs).
> >
> > which was in the email thread, but I didn't pick it up and neither
> > `b4` did, my mistake.
> 
> By the way, if LoongArch (Cc'd) would like to backport commit
> 
>   74f8295c6fb8 ("LoongArch: Handle jump tables options for RUST")
> 
> then this would be a good chance to do so, since the one here would go
> on top of that one (Alyssa backported the x86 subset of the patch --
> for the future, by the way, it would be nice to note it in the commit
> message in between [ ... ]).

It doesn't apply to the 6.12.y tree cleanly :(

thanks,

greg k-h