From: Masahiro Yamada <masahiroy@kernel.org>
To: David Laight <David.Laight@aculab.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>,
Nick Desaulniers <ndesaulniers@google.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net v3] net: Force inlining of checksum functions in net/checksum.h
Date: Fri, 18 Feb 2022 02:27:16 +0900 [thread overview]
Message-ID: <CAK7LNASvBLLWMa+kb5eGJ6vpSqob_dBUxwCnpHZfL-spzRG7qA@mail.gmail.com> (raw)
In-Reply-To: <2e38265880db45afa96cfb51223f7418@AcuMS.aculab.com>
On Fri, Feb 18, 2022 at 1:49 AM David Laight <David.Laight@aculab.com> wrote:
>
> From: Masahiro Yamada
> > Sent: 17 February 2022 16:17
> ...
> > No. Not that one.
> >
> > The commit you presumably want to revert is:
> >
> > a771f2b82aa2 ("[PATCH] Add a section about inlining to
> > Documentation/CodingStyle")
> >
> > This is now referred to as "__always_inline disease", though.
>
> That description is largely fine.
>
> Inappropriate 'inline' ought to be removed.
> Then 'inline' means - 'really do inline this'.
You cannot change "static inline" to "static"
in header files.
If "static inline" meant __always_inline,
there would be no way to negate it.
That's why we need both inline and __always_inline.
> Anyone remember massive 100+ line #defines being
> used to get code inlined 'to make it faster'.
> Sometimes being expanded several times in succession.
> May have helped a 68020, but likely to be a loss on
> modern cpu with large I-cache and slow memory.
>
> David
>
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2022-02-17 17:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-17 12:19 [PATCH net v3] net: Force inlining of checksum functions in net/checksum.h Christophe Leroy
2022-02-17 13:36 ` David Laight
2022-02-17 14:50 ` Christophe Leroy
2022-02-17 14:55 ` Christophe Leroy
2022-02-17 15:15 ` David Laight
2022-02-17 16:17 ` Masahiro Yamada
2022-02-17 16:49 ` David Laight
2022-02-17 17:27 ` Masahiro Yamada [this message]
2022-02-17 18:07 ` Segher Boessenkool
2022-02-18 1:35 ` Masahiro Yamada
2022-02-18 12:12 ` Segher Boessenkool
2022-02-18 16:29 ` Stephen Hemminger
2022-02-18 16:44 ` Segher Boessenkool
2022-02-18 8:41 ` David Laight
2022-02-17 15:42 ` Joe Perches
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