From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
Denys Vlasenko <dvlasenk@redhat.com>, Thomas Graf <tgraf@suug.ch>,
Peter Zijlstra <peterz@infradead.org>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
jamborm@gcc.gnu.org, Ingo Molnar <mingo@kernel.org>,
Himanshu Madhani <himanshu.madhani@qlogic.com>,
qla2xxx-upstream@qlogic.com
Subject: Re: [PATCH] scsi: fc: force inlining of wwn conversion functions
Date: Tue, 26 Apr 2016 09:06:54 -0400 [thread overview]
Message-ID: <yq14maoh635.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <5249561.9VpAPLD61M@wuerfel> (Arnd Bergmann's message of "Tue, 26 Apr 2016 09:22:46 +0200")
>>>>> "Arnd" == Arnd Bergmann <arnd@arndb.de> writes:
Arnd> I don't think we can realistically blacklist gcc-4.9.{0,1,2,3},
Arnd> gcc-5.{0,1,2,3}.* and gcc-6.0 and require everyone to upgrade to
Arnd> compilers that have not been released yet in order to build a
Arnd> linux-4.6 kernel.
I agree that compiler blacklisting is problematic and I'd like to avoid
it. The question is how far we go in the kernel to accommodate various
levels of brokenness.
In any case. Sticking compiler workarounds in device driver code is akin
to putting demolition orders on display on Alpha Centauri. At the very
minimum the patch should put a fat comment in the code stating that
these wrapper functions or #defines should not be changed in the future
because that'll break builds using gcc XYZ. But that does not solve the
problem for anybody else that might be doing something similar.
Converting between u64 and $RANDOM_TYPE in an inline wrapper does not
seem like a rare and unusual programming pattern.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2016-04-26 13:08 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-04 19:45 [PATCH] asm-generic: force inlining of some atomic_long operations Denys Vlasenko
2016-02-04 19:45 ` [PATCH] force inlining of some byteswap operations Denys Vlasenko
2016-02-05 7:28 ` Ingo Molnar
2016-04-13 3:36 ` This patch triggers a bad gcc bug (was Re: [PATCH] force inlining of some byteswap operations) Josh Poimboeuf
2016-04-13 12:12 ` Denys Vlasenko
2016-04-13 12:36 ` Josh Poimboeuf
2016-04-13 15:15 ` Josh Poimboeuf
2016-04-13 16:55 ` James Bottomley
2016-04-13 17:10 ` Josh Poimboeuf
2016-04-14 15:29 ` Denys Vlasenko
2016-04-14 15:57 ` Josh Poimboeuf
2016-04-14 17:09 ` Denys Vlasenko
2016-04-15 5:45 ` Ingo Molnar
2016-04-15 13:47 ` Josh Poimboeuf
2016-04-15 22:20 ` Josh Poimboeuf
2016-04-16 9:03 ` Ingo Molnar
2016-04-18 13:39 ` Josh Poimboeuf
2016-04-18 14:07 ` Arnd Bergmann
2016-04-18 14:12 ` Josh Poimboeuf
2016-04-18 14:21 ` Arnd Bergmann
2016-04-19 8:52 ` Ingo Molnar
2016-04-19 13:56 ` [PATCH] scsi: fc: force inlining of wwn conversion functions Josh Poimboeuf
2016-04-22 23:17 ` Quinn Tran
2016-04-25 16:07 ` Josh Poimboeuf
2016-04-26 2:40 ` Martin K. Petersen
2016-04-26 3:37 ` James Bottomley
2016-04-26 7:22 ` Arnd Bergmann
2016-04-26 8:35 ` Christoph Hellwig
2016-04-26 10:05 ` Arnd Bergmann
2016-04-26 13:06 ` Martin K. Petersen [this message]
2016-04-26 15:58 ` Arnd Bergmann
2016-04-26 22:36 ` James Bottomley
2016-04-27 0:44 ` Martin K. Petersen
2016-04-27 11:05 ` Martin Jambor
2016-04-27 21:34 ` Arnd Bergmann
2016-04-28 14:58 ` Chris Metcalf
2016-04-28 15:23 ` Arnd Bergmann
2016-04-28 15:48 ` Chris Metcalf
2016-04-27 22:00 ` [PATCH, RFT] byteswap: try to avoid __builtin_constant_p gcc bug Arnd Bergmann
2016-04-27 22:11 ` Josh Poimboeuf
2016-04-28 16:27 ` Quinn Tran
2016-04-16 7:42 ` This patch triggers a bad gcc bug (was Re: [PATCH] force inlining of some byteswap operations) Arnd Bergmann
2016-04-18 13:22 ` Josh Poimboeuf
2016-02-04 19:45 ` [PATCH] force inlining of unaligned byteswap operations Denys Vlasenko
2016-02-05 7:28 ` Ingo Molnar
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