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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
	Borislav Petkov <bp@alien8.de>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Rong Chen <rong.a.chen@intel.com>,
	kernel test robot <lkp@intel.com>,
	"Li, Philip" <philip.li@intel.com>, x86-ml <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Marco Elver <elver@google.com>
Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e
Date: Tue, 15 Sep 2020 18:44:01 -0400	[thread overview]
Message-ID: <20200915224401.GA1156663@rani.riverdale.lan> (raw)
In-Reply-To: <CAKwvOdnctit9cQ9Na8kO5TXbZh-3ZV5x1=GLHhRVdBUK23HjnA@mail.gmail.com>

On Tue, Sep 15, 2020 at 02:59:19PM -0700, Nick Desaulniers wrote:
> On Tue, Sep 15, 2020 at 2:50 PM Arvind Sankar <nivedita@alum.mit.edu> wrote:
> >
> > On Tue, Sep 15, 2020 at 10:49:12PM +0200, Borislav Petkov wrote:
> > >
> > > (Btw, clang doesn't need to add that "xor %eax,%eax" - panic() should not be
> > >  returning, ever. :-))
> > >
> >
> > I think this is because panic() is varargs, and clang doesn't support
> > gcc's -mskip-rax-setup. The normal ABI requires the caller to set RAX to
> > the number of arguments in vector registers.
> >
> > https://patchwork.ozlabs.org/project/gcc/patch/20141218131150.GA32638@intel.com/
> 
> Thanks for the report.  Filed
> https://bugs.llvm.org/show_bug.cgi?id=47538.  Do you have an account
> there Arvind so that I can CC you on them?

Nope, no bugzilla account.

If you're adding flags, another set the kernel uses is the
-falign-{jumps,labels,loops} to turn off alignment of jumps and loops.

> 
> Yikes, it looks like gcc 5.0 supports that.  We'd better get to
> implementing that lest someone try to remove the cc-option on it soon.
> -- 
> Thanks,
> ~Nick Desaulniers

  reply	other threads:[~2020-09-15 22:44 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15 13:42 [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e kernel test robot
2020-09-15 13:55 ` Borislav Petkov
2020-09-15 14:18   ` Rong Chen
2020-09-15 14:41     ` Borislav Petkov
2020-09-15 16:05     ` Borislav Petkov
2020-09-15 17:02       ` Josh Poimboeuf
2020-09-15 17:21         ` Borislav Petkov
2020-09-15 17:34           ` Borislav Petkov
2020-09-15 17:41             ` Nick Desaulniers
2020-09-15 18:01               ` Borislav Petkov
2020-09-15 18:04                 ` Nick Desaulniers
2020-09-15 17:40           ` Nick Desaulniers
2020-09-15 18:09             ` Marco Elver
2020-09-16  8:30               ` peterz
2020-09-16  8:46                 ` Marco Elver
2020-09-16  9:06                   ` peterz
2020-09-16  9:33                     ` Marco Elver
2020-09-16 18:22                   ` Nick Desaulniers
2020-09-16 18:51                     ` Marco Elver
2020-09-17  4:11                       ` Fangrui Song
     [not found]                       ` <333D40A0-4550-4309-9693-1ABA4AC75399@arm.com>
2020-09-17 11:04                         ` Mark Rutland
2020-09-17 11:16                           ` Daniel Kiss
2020-09-17 18:39                     ` Josh Poimboeuf
2020-09-15 17:44         ` Nick Desaulniers
2020-09-15 20:12         ` Nick Desaulniers
2020-09-15 20:49           ` Borislav Petkov
2020-09-15 21:02             ` Josh Poimboeuf
2020-09-15 21:14               ` Borislav Petkov
2020-09-15 22:34               ` Nick Desaulniers
2020-09-16  7:03                 ` Ilie Halip
2020-09-16  8:59                 ` Marco Elver
2020-09-21 16:51                 ` [tip: objtool/core] objtool: Ignore unreachable trap after call to noreturn functions tip-bot2 for Ilie Halip
2020-09-15 21:50             ` [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e Arvind Sankar
2020-09-15 21:59               ` Nick Desaulniers
2020-09-15 22:44                 ` Arvind Sankar [this message]
2020-09-16 11:34               ` Borislav Petkov
2020-09-16 18:28                 ` Nick Desaulniers
2020-09-16 18:48                   ` Borislav Petkov
2020-09-15 21:13           ` Nick Desaulniers
2020-09-15 21:28             ` Josh Poimboeuf
2020-09-15 23:35               ` Marco Elver

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