linux-kernel - Re: [PATCH 5/9] vdso: Split linux/minmax.h

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Message-ID: <1d86a38b-dd57-48ac-875b-4d9d2f645d47@arm.com>
Date: Fri, 6 Sep 2024 12:41:11 +0100
From: Vincenzo Frascino <vincenzo.frascino@....com>
To: Arnd Bergmann <arnd@...db.de>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 linux-kernel@...r.kernel.org, Linux-Arch <linux-arch@...r.kernel.org>,
 linux-mm@...ck.org
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 "Jason A . Donenfeld" <Jason@...c4.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Naveen N Rao <naveen@...nel.org>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH 5/9] vdso: Split linux/minmax.h

On 04/09/2024 18:23, Arnd Bergmann wrote:
> On Wed, Sep 4, 2024, at 17:17, Christophe Leroy wrote:
>> Le 03/09/2024 à 17:14, Vincenzo Frascino a écrit :
>>> The VDSO implementation includes headers from outside of the
>>> vdso/ namespace.
>>>
>>> Split linux/minmax.h to make sure that the generic library
>>> uses only the allowed namespace.
>>
>> It is probably easier to just don't use min_t() in VDSO. Can be open 
>> coded without impeeding readability.
> 
> Right, or possibly the even simpler MIN()/MAX() if the arguments
> have no side-effects.
> 

Agreed, generally I do not like open-coding since it tends to introduce
duplication, but these cases are simple especially if we can use MIN()/MAX().

>        Arnd

-- 
Regards,
Vincenzo