This is the mail archive of the
mailing list for the GCC project.
Re: [sparc64] kernel OOPS with gcc 7.1 / 7.2
From: Anthony Yznaga <firstname.lastname@example.org>
Date: Tue, 15 Aug 2017 17:45:12 -0700
> I compiled a kernel with gcc 7 and found that the compiler inserted a
> call to __multi3() in mq_attr_ok(). The sparc64 implementation of
> __multi3() was added by 1b4af13ff2cc specifically for gcc 7 and later,
> but it clobbers %g4 and %g5. Not sure if that was intended but it
> looks like __multi3() is not safe to call from kernel code.
Good catch, we have to redo the register allocation in that routine
to fix this.