linux-kernel - Re: Linux 4.19 and GCC 9

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Message-ID: <20190517094813.GA15090@kroah.com>
Date:   Fri, 17 May 2019 11:48:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ivan Babrou <ivan@...udflare.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>
Subject: Re: Linux 4.19 and GCC 9

On Fri, May 17, 2019 at 11:01:45AM +0200, Miguel Ojeda wrote:
> On Fri, May 17, 2019 at 10:51 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> > On Fri, May 17, 2019 at 10:35:29AM +0200, Miguel Ojeda wrote:
> > > On Fri, May 17, 2019 at 9:38 AM Peter Zijlstra <peterz@...radead.org> wrote:
> > > >
> > > > Right; if there is anything you can reproduce on linus.git I'll happily
> > > > have a look. If it doesn't reproduce all you have to do is find the
> > > > patches that make it work and ask Greg.
> > >
> > > Just to clarify: Linus' master is clean of these issues with GCC 9.1.1.
> >
> > Great!  Care to find the patches that did that work and send me the git
> > commit ids so that I can queue them up?  I don't have gcc9 here yet on
> > my systems, so I can not test for this.
> 
> I am unsure about the perf and the objtools parts (Peter/Josh?), but
> about the -Wmissing-attributes I cleaned, they were these:
> 
> a6e60d84989f ("include/linux/module.h: copy __init/__exit attrs to
> init/cleanup_module")
> c0d9782f5b6d ("Compiler Attributes: add support for __copy (gcc >= 9)")
> ff98e20ef208 ("lib/crc32.c: mark crc32_le_base/__crc32c_le_base
> aliases as __pure")

This last patch is not needed, as that only resolves something that
showed in in 4.20.

thanks,

greg k-h