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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Thomas Gleixner <tglx@linutronix.de>,
	Nick Desaulniers <ndesaulniers@google.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
	Borislav Petkov <bp@alien8.de>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Zhenzhong Duan <zhenzhong.duan@oracle.com>,
	Kees Cook <keescook@chromium.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Juergen Gross <jgross@suse.com>,
	Andy Lutomirski <luto@kernel.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	LKML <linux-kernel@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Will Deacon <will@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH] x86: work around clang IAS bug referencing __force_order
Date: Sat, 22 Aug 2020 20:17:32 +0200
Message-ID: <CANiq72=3iOh5Z_rboZf-_GUpBE2LUUv3yPKOVNN_XmaNswdNSw@mail.gmail.com> (raw)
In-Reply-To: <CA+icZUWGHo3mkN4=ZYeU37p8KJhxTXS5QKcAvq_HaqTHmFkw2g@mail.gmail.com>

On Sat, Aug 22, 2020 at 11:52 AM Sedat Dilek <sedat.dilek@gmail.com> wrote:
>
> I am asking myself who is using such ancient compilers?

There are many users/companies using older versions of compilers,
kernels and everything. GCC <= 4.9 will still be used/supported (by
third parties) for a handful of years at least.

However, the important question is whether those users/companies care
about running the latest kernels. Many of those definitely do not want
to touch their kernel either. For those that do, there are several
longterms to pick from that still support 4.9, as well as other
workarounds.

Thus I am usually in favor of raising the minimum whenever new hacks
are required to be added. On the other hand, we already raised the
version twice this year and it is not clear to me what is the minimum
version we would need to go for to ensure this does not bite us.

> If this is a real problem with GCC version <= 5, so can this be moved
> to a GCC specific include header-file?
> Thinking of include/linux/compiler-gcc.h or
> include/linux/compiler_types.h with a GCC-VERSION check?

That would be better if it can be done, yes.

Cheers,
Miguel

  parent reply index

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-27 13:53 Arnd Bergmann
2020-08-01 11:50 ` Sedat Dilek
2020-08-06 22:13   ` Thomas Gleixner
2020-08-07  7:03     ` Sedat Dilek
2020-08-04  0:09 ` Nick Desaulniers
2020-08-14 17:29   ` Sedat Dilek
2020-08-14 21:19     ` Sedat Dilek
2020-08-14 22:57       ` Nick Desaulniers
2020-08-15  0:26         ` Nick Desaulniers
2020-08-15  3:28           ` Sedat Dilek
2020-08-15  8:23             ` Sedat Dilek
2020-08-15 10:46               ` Sedat Dilek
2020-08-15 14:39                 ` Sedat Dilek
2020-08-16  9:37                   ` Sedat Dilek
2020-08-06 22:11 ` Thomas Gleixner
2020-08-13  0:12   ` Nick Desaulniers
2020-08-13  8:49     ` David Laight
2020-08-13 17:20     ` Arvind Sankar
2020-08-13 17:28     ` Thomas Gleixner
2020-08-13 17:37       ` Paul E. McKenney
2020-08-13 18:09         ` Arvind Sankar
2020-08-13 18:20           ` Paul E. McKenney
2020-08-20 10:44           ` Thomas Gleixner
2020-08-20 13:06             ` Arvind Sankar
2020-08-21  0:37               ` Thomas Gleixner
2020-08-21 23:04                 ` Arvind Sankar
2020-08-21 23:16                   ` Nick Desaulniers
2020-08-21 23:25                     ` Arvind Sankar
2020-08-22  0:43                     ` Thomas Gleixner
2020-08-22  3:55                       ` Arvind Sankar
2020-08-22  8:41                         ` Segher Boessenkool
2020-08-22  9:23                           ` Sedat Dilek
2020-08-22  9:51                             ` Sedat Dilek
2020-08-22 10:26                               ` Segher Boessenkool
2020-08-22 10:35                                 ` Arnd Bergmann
2020-08-22 18:17                               ` Miguel Ojeda [this message]
2020-08-22 21:08                                 ` Linus Torvalds
2020-08-22 23:10                                   ` Arvind Sankar
2020-08-23  0:10                                     ` Linus Torvalds
2020-08-23  1:16                                       ` Arvind Sankar
2020-08-23 21:25                                         ` [PATCH] x86/asm: Replace __force_order with memory clobber Arvind Sankar
2020-08-24 17:50                                           ` Nathan Chancellor
2020-08-24 19:13                                           ` Miguel Ojeda
2020-08-25 15:19                                             ` Arvind Sankar
2020-08-25 15:21                                               ` Sedat Dilek
2020-09-02 15:33                                           ` [PATCH v2] " Arvind Sankar
2020-09-02 15:58                                             ` David Laight
2020-09-02 16:14                                               ` Arvind Sankar
2020-09-02 16:08                                             ` Arvind Sankar
2020-09-02 20:26                                               ` David Laight
2020-09-02 17:16                                             ` Segher Boessenkool
2020-09-02 17:36                                               ` Arvind Sankar
2020-09-02 18:19                                             ` Miguel Ojeda
2020-09-02 18:24                                               ` Arvind Sankar
2020-09-02 23:21                                           ` [PATCH v3] " Arvind Sankar
2020-09-03  2:17                                             ` Kees Cook
2020-09-03  5:34                                             ` Miguel Ojeda
2020-09-30 20:50                                             ` Kees Cook
2020-10-01 10:12                                             ` [tip: x86/asm] x86/asm: Replace __force_order with a " tip-bot2 for Arvind Sankar
2020-10-13  9:30                                             ` tip-bot2 for Arvind Sankar
2020-08-22 21:17                                 ` [PATCH] x86: work around clang IAS bug referencing __force_order Arvind Sankar
2020-08-23 13:31                                   ` David Laight
2020-09-08 22:25                               ` Pavel Machek

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