From: Borislav Petkov <bp@alien8.de>
To: Michael Matz <matz@suse.de>
Cc: Yi Wang <wang.yi59@zte.com.cn>,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
x86@kernel.org, suravee.suthikulpanit@amd.com, puwen@hygon.cn,
davidwang@zhaoxin.com, linux-kernel@vger.kernel.org,
zhong.weidong@zte.com.cn
Subject: Re: [PATCH v2] x86/cpu: fix prototype warning
Date: Thu, 8 Nov 2018 18:22:25 +0100 [thread overview]
Message-ID: <20181108172225.GH7543@zn.tnic> (raw)
In-Reply-To: <alpine.LSU.2.21.1811081538120.21712@wotan.suse.de>
On Thu, Nov 08, 2018 at 03:47:32PM +0000, Michael Matz wrote:
> What tglx said. If you don't intend such functions to be called
> from other units make them static, if you do intend them to be callable
> declare the properly.
>
> [There's also one subtle issue with argument promotions. prototypeless
> functions are called as if they are declared "int name()" that is
> default argument promotions take place (float->double, {char,short}->int),
> which won't happen with prototypes, and argument type conversions won't
> take place (as no parameter types are known). This might lead to
> different values between calling a prototyped and a prototype-less
> function arriving at the function even though the call expression looked
> the same]
Eww, that's yucky.
Ok, so we should enalbe this warning by default then. And doing that in
the main Makefile gives ~1400 warnings on an allmodconfig build.
Yi Wang, I guess you have a long road in front of you. :-)
Thx.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2018-11-08 17:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 1:12 [PATCH v2] x86/cpu: fix prototype warning Yi Wang
2018-11-08 15:03 ` Borislav Petkov
2018-11-08 15:32 ` Borislav Petkov
2018-11-08 15:35 ` Thomas Gleixner
2018-11-08 15:41 ` Borislav Petkov
2018-11-09 16:07 ` David Laight
2018-11-10 10:51 ` [tip:ras/core] x86/mce: Fix -Wmissing-prototypes warnings tip-bot for Borislav Petkov
2018-11-10 14:16 ` Borislav Petkov
2018-11-12 5:24 ` Ingo Molnar
2018-11-12 12:19 ` Borislav Petkov
2018-11-13 14:22 ` [tip:x86/cleanups] x86/traps: Complete prototype declarations tip-bot for Borislav Petkov
2018-11-14 13:19 ` tip-bot for Borislav Petkov
2018-11-13 14:21 ` [tip:x86/cleanups] x86/mce: Fix -Wmissing-prototypes warnings tip-bot for Borislav Petkov
2018-11-14 13:18 ` tip-bot for Borislav Petkov
2018-11-08 15:47 ` [PATCH v2] x86/cpu: fix prototype warning Michael Matz
2018-11-08 17:22 ` Borislav Petkov [this message]
[not found] ` <201811090843126464658@zte.com.cn>
2018-11-09 10:55 ` Borislav Petkov
2018-11-09 11:12 ` Greg KH
2018-11-09 11:41 ` Borislav Petkov
2018-11-09 12:25 ` Greg KH
2018-11-09 22:17 ` Borislav Petkov
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