Re: [PATCH] nios2: ksyms: Declare __mulsi3 export

[Dinh Nguyen]

On 10/19/26 06:16, Arnd Bergmann wrote:
> On Mon, Oct 19, 2026, at 11:49, Thomas Weißschuh wrote:
> > GCC may emit libcalls to __mulsi3(). As modpost is not aware that this
> > function is provided through the linked in libgcc, it fails:
> >
> > ERROR: modpost: kernel/locking/test-ww_mutex.ko: symbol '__mulsi3' undefined!
> > ERROR: modpost: kernel/time/test_udelay.ko: symbol '__mulsi3' undefined!
> > ERROR: modpost: kernel/resource_kunit.ko: symbol '__mulsi3' undefined!
> > ERROR: modpost: fs/fuse/virtiofs.ko: symbol '__mulsi3' undefined!
> > etc.
> >
> > Make sure modpost can see the symbol from libgcc.
> >
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > Closes:
> > https://lore.kernel.org/oe-kbuild-all/202610171933.J4bFOfL8-lkp@xxxxxxxxx/
> > Fixes: 2fc8483fdcde ("nios2: Build infrastructure")
> > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
>
> Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
>
> The patch looks correct to me, but it would also be nice to not use
> libgcc at all. What I see is that only arc, nios2, openrisc and
> parisc still link against the toolchain-provided libgcc, everything
> else uses the kernel's own runtime.
>
> It's probably not even that hard to do right, here is what I found
> is imported from libgcc.
Patch applied!

Thanks for the suggestion Arnd, I'll work to on the NIOS2.

Dinh