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Re: [sparc64] kernel OOPS with gcc 7.1 / 7.2

From: David Miller <davem at davemloft dot net>
To: anthony dot yznaga at oracle dot com
Cc: matorola at gmail dot com, sparclinux at vger dot kernel dot org, gcc at gcc dot gnu dot org, strace-devel at lists dot sourceforge dot net, ldv at altlinux dot org
Date: Tue, 15 Aug 2017 17:51:49 -0700 (PDT)
Subject: Re: [sparc64] kernel OOPS with gcc 7.1 / 7.2
Authentication-results: sourceware.org; auth=none
References: <CADxRZqw4Qomu0n2k0hC4to-wp9GW8FR_k290sD6HmTXbgmBa0A@mail.gmail.com> <D8553E6D-5D84-43BC-8344-887E7B7DA3F4@oracle.com>

From: Anthony Yznaga <anthony.yznaga@oracle.com>
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.

References:
- [sparc64] kernel OOPS with gcc 7.1 / 7.2
  - From: Anatoly Pugachev
- Re: [sparc64] kernel OOPS with gcc 7.1 / 7.2
  - From: Anthony Yznaga

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