linux-kernel - Re: [PATCH 7/7] Compiler Attributes: use feature checks instead of version checks

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Message-ID: <20180901183920.GA8341@kroah.com>
Date:   Sat, 1 Sep 2018 11:39:20 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Eli Friedman <efriedma@...eaurora.org>,
        Christopher Li <sparse@...isli.org>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Joe Perches <joe@...ches.com>,
        Dominique Martinet <asmadeus@...ewreck.org>
Subject: Re: [PATCH 7/7] Compiler Attributes: use feature checks instead of
 version checks

On Sat, Sep 01, 2018 at 03:38:13PM +0200, Miguel Ojeda wrote:
> Hi Nick,
> 
> On Sat, Sep 1, 2018 at 1:07 AM, Nick Desaulniers
> <ndesaulniers@...gle.com> wrote:
> > Overall, pretty happy with this patch.  Still some thoughts for a v3,
> >> -#define __visible      __attribute__((externally_visible))
> >> diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
> >> new file mode 100644
> >> index 000000000000..a9dfafc8fd19
> >> --- /dev/null
> >> +++ b/include/linux/compiler_attributes.h
> >> @@ -0,0 +1,226 @@
> >
> > New file needs an SPDX license identifier right?
> 
> Yeah, but I wasn't sure of adding it, since the code I moved (even if
> rearranged) from _types.h does not have it either. Any legal expert
> here? Is _types.h it implicitly GPL 2? We should add the identifier to
> both if so.

It looks like we missed that file in the big "properly add SPDX
identifiers to all files without a license" commit as it came in from a
different tree.

But yes, it is GPLv2 only implicitly, so you can add that.  I should
sweep the tree again to see if anything else has been added accidentally
with that same problem.

thanks,

greg k-h