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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu, 3 Oct 2019 10:29:21 -0700
Message-ID: <CAHk-=wj9Dbom1x7qDfrXgNbjdFa_84bAUMdGigs4sELQQW28wg@mail.gmail.com>
Subject: Re: [PATCH] compiler: enable CONFIG_OPTIMIZE_INLINING forcibly
To:     Masahiro Yamada <yamada.masahiro@socionext.com>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Russell King - ARM Linux admin <linux@armlinux.org.uk>,
        Will Deacon <will@kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
        linux-arch <linux-arch@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Stefan Wahren <wahrenst@gmx.net>,
        Kees Cook <keescook@google.com>, Arnd Bergmann <arnd@arndb.de>,
        clang-built-linux <clang-built-linux@googlegroups.com>
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On Thu, Oct 3, 2019 at 10:24 AM Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
>
> I just want to annotate __always_inline for the case
> "2. code that if not inlined is somehow not correct."

Oh, I support that entirely - if only for documentation.

But I do *not* support the dismissal of the architecture maintainers
concerns about "does it work?" and apparently known compiler bugs.

> Again, not saying "use a macro".

Other people did, though.

And there seemed to be little balancing of the pain vs the gain. The
gain really isn't that obvious. If the code shrinks by a couple of kB,
is that good or bad? Maybe it is smaller, but is it _better_?

            Linus