From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: the arch/x86 maintainers <x86@kernel.org>,
Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>, Nadav Amit <namit@vmware.com>,
Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>
Subject: Re: [RFC PATCH 0/5] make use of gcc 9's "asm inline()"
Date: Fri, 30 Aug 2019 09:45:07 +0200 [thread overview]
Message-ID: <c3b71dff-c884-28b6-a4c7-ff2bf12720d4@rasmusvillemoes.dk> (raw)
In-Reply-To: <CAHk-=wihp7KZ_WjA16odsU7eGb-rUfg7J0rhqwhRoD0zjyGHpw@mail.gmail.com>
On 29/08/2019 18.05, Linus Torvalds wrote:
> On Thu, Aug 29, 2019 at 1:32 AM Rasmus Villemoes
> <linux@rasmusvillemoes.dk> wrote:
>>
>> But since we #define the identifier inline to attach some attributes,
>> we have to use the alternate spelling __inline__ of that
>> keyword. Unfortunately, we also currently #define that one (to
>> inline), so we first have to get rid of all (mis)uses of
>> __inline__. Hence the huge diffstat.
>
> Ugh. Not pretty, but I guess we're stuck with it.
>
> However, it worries me a bit that you excluide the UAPI headers where
> we still use "__inline__", and now the semantics of that will change
> for the kernel (for some odd gcc versions).
Yeah, as I wrote I was aware of that, but didn't have any good ideas, so
I was fishing. Doing
#ifdef __KERNEL__
#define __uapi_inline inline
#else
#define __uapi_inline __inline__
#endif
was one of the bad ideas...
> I suspect we should just bite the bullet and you should do it to the
> uapi headers too. We already use "inline" in a lot of them, so it's
> not the case that we're using __inline__ because of some namespace
> issue, as far as I can tell.
>
> One option might be to just use "__inline" for the asm_inline thing.
> We have way fewer of those. That would make the noise much less for
> this patch series.
Ah, interesting. I didn't know that was also a compiler provided alias.
It seems to be entirely undocumented -
https://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html just mentions
the __inline__ (and __asm__) spellings. But it's clear as day in the gcc
sources
{ "__inline", RID_INLINE, 0 },
{ "__inline__", RID_INLINE, 0 },
and has been that way since forever, AFAICT.
So yes, let's just start by getting rid of the __inline define and fix
the staging (+acpi,zstd) users, to allow asm_inline to progress. I'll
respin.
Rasmus
next prev parent reply other threads:[~2019-08-30 7:45 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 8:32 [RFC PATCH 0/5] make use of gcc 9's "asm inline()" Rasmus Villemoes
2019-08-29 8:32 ` [RFC PATCH 1/5] treewide: replace __inline__ by inline Rasmus Villemoes
2019-08-29 16:29 ` Joe Perches
2019-08-29 8:32 ` [RFC PATCH 2/5] compiler_types.h: don't #define __inline__ Rasmus Villemoes
2019-08-29 8:32 ` [RFC PATCH 3/5] compiler-gcc.h: add asm_inline definition Rasmus Villemoes
2019-08-29 8:32 ` [RFC PATCH 4/5] x86: alternative.h: use asm_inline for all alternative variants Rasmus Villemoes
2019-08-29 8:32 ` [RFC PATCH 5/5] x86: bug.h: use asm_inline in _BUG_FLAGS definitions Rasmus Villemoes
2019-08-29 16:05 ` [RFC PATCH 0/5] make use of gcc 9's "asm inline()" Linus Torvalds
2019-08-30 7:45 ` Rasmus Villemoes [this message]
2019-08-29 17:36 ` Nick Desaulniers
2019-08-29 18:15 ` Linus Torvalds
2019-08-29 18:26 ` Nadav Amit
2019-08-29 18:42 ` Borislav Petkov
2019-08-29 19:41 ` Masahiro Yamada
2019-08-30 23:15 ` [PATCH v2 0/6] " Rasmus Villemoes
2019-08-30 23:15 ` [PATCH v2 1/6] staging: rtl8723bs: replace __inline by inline Rasmus Villemoes
2019-09-04 23:54 ` Nick Desaulniers
2019-08-30 23:15 ` [PATCH v2 2/6] lib/zstd/mem.h: " Rasmus Villemoes
2019-09-04 23:59 ` Nick Desaulniers
2019-09-05 0:07 ` Miguel Ojeda
2019-09-05 9:28 ` Rasmus Villemoes
2019-08-30 23:15 ` [PATCH v2 3/6] compiler_types.h: don't #define __inline Rasmus Villemoes
2019-09-05 0:13 ` Nick Desaulniers
2019-09-05 9:45 ` Rasmus Villemoes
2019-08-30 23:15 ` [PATCH v2 4/6] compiler-gcc.h: add asm_inline definition Rasmus Villemoes
2019-09-05 0:18 ` Nick Desaulniers
2019-09-05 5:43 ` Nadav Amit
2019-09-05 11:07 ` Rasmus Villemoes
2019-09-05 13:45 ` Segher Boessenkool
2019-09-05 14:23 ` Rasmus Villemoes
2019-09-05 14:47 ` Segher Boessenkool
2019-09-05 15:52 ` Miguel Ojeda
2019-09-05 16:13 ` Miguel Ojeda
2019-09-06 12:23 ` Segher Boessenkool
2019-09-06 15:13 ` Miguel Ojeda
2019-09-06 16:30 ` Segher Boessenkool
2019-09-06 16:39 ` Jakub Jelinek
2019-09-06 18:14 ` Nick Desaulniers
2019-09-06 22:03 ` Segher Boessenkool
2019-09-06 22:35 ` Nick Desaulniers
2019-09-06 22:56 ` Segher Boessenkool
2019-09-06 23:42 ` Nick Desaulniers
2019-09-07 0:14 ` Segher Boessenkool
2019-09-07 1:04 ` Nick Desaulniers
2019-09-07 13:11 ` Segher Boessenkool
2019-09-08 13:55 ` Miguel Ojeda
2019-09-12 21:54 ` Nick Desaulniers
2019-09-12 22:12 ` Rasmus Villemoes
2019-09-20 0:50 ` Segher Boessenkool
2019-09-06 16:47 ` Miguel Ojeda
2019-08-30 23:15 ` [PATCH v2 5/6] x86: alternative.h: use asm_inline for all alternative variants Rasmus Villemoes
2019-08-30 23:15 ` [PATCH v2 6/6] x86: bug.h: use asm_inline in _BUG_FLAGS definitions Rasmus Villemoes
2019-09-12 22:19 ` [PATCH v3 0/6] make use of gcc 9's "asm inline()" Rasmus Villemoes
2019-09-12 22:19 ` [PATCH v3 1/6] staging: rtl8723bs: replace __inline by inline Rasmus Villemoes
2019-09-29 10:40 ` Greg Kroah-Hartman
2019-09-12 22:19 ` [PATCH v3 2/6] lib/zstd/mem.h: " Rasmus Villemoes
2019-09-12 22:19 ` [PATCH v3 3/6] compiler_types.h: don't #define __inline Rasmus Villemoes
2019-09-12 22:19 ` [PATCH v3 4/6] compiler-types.h: add asm_inline definition Rasmus Villemoes
2019-09-12 22:19 ` [PATCH v3 5/6] x86: alternative.h: use asm_inline for all alternative variants Rasmus Villemoes
2019-09-13 5:41 ` Ingo Molnar
2019-09-12 22:19 ` [PATCH v3 6/6] x86: bug.h: use asm_inline in _BUG_FLAGS definitions Rasmus Villemoes
2019-09-13 5:42 ` Ingo Molnar
2019-09-12 22:30 ` [PATCH v3 0/6] make use of gcc 9's "asm inline()" Miguel Ojeda
2019-09-13 6:11 ` Rasmus Villemoes
2019-09-13 15:21 ` Greg Kroah-Hartman
2019-09-15 18:20 ` Miguel Ojeda
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