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From: Kalle Valo <kvalo@codeaurora.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Christian Lamparter <chunkeey@gmail.com>,
	Lee Jones <lee.jones@linaro.org>,
	davem@davemloft.net, kuba@kernel.org,
	linux-kernel@vger.kernel.org,
	Christian Lamparter <chunkeey@googlemail.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 08/30] net: wireless: ath: carl9170: Mark 'ar9170_qmap' as __maybe_unused
Date: Mon, 17 Aug 2020 15:59:47 +0300	[thread overview]
Message-ID: <87eeo5mnr0.fsf@codeaurora.org> (raw)
In-Reply-To: <9776eb47-6b83-a891-f057-dd34d14ea16e@rasmusvillemoes.dk> (Rasmus Villemoes's message of "Mon, 17 Aug 2020 10:26:16 +0200")

Rasmus Villemoes <linux@rasmusvillemoes.dk> writes:

> On 14/08/2020 17.14, Christian Lamparter wrote:
>> On 2020-08-14 13:39, Lee Jones wrote:
>>> 'ar9170_qmap' is used in some source files which include carl9170.h,
>>> but not all of them.  Mark it as __maybe_unused to show that this is
>>> not only okay, it's expected.
>>>
>>> Fixes the following W=1 kernel build warning(s)
>> 
>> Is this W=1 really a "must" requirement? I find it strange having
>> __maybe_unused in header files as this "suggests" that the
>> definition is redundant.
>
> In this case it seems one could replace the table lookup with a
>
> static inline u8 ar9170_qmap(u8 idx) { return 3 - idx; }
>
> gcc doesn't warn about unused static inline functions (or one would have
> a million warnings to deal with). Just my $0.02.

Yeah, this is much better.

And I think that static variables should not even be in the header
files. Doesn't it mean that there's a local copy of the variable
everytime the .h file is included? Sure, in this case the overhead is
small (4 bytes per include) but still it's wrong. Having a static inline
function would solve that problem as well the compiler warning.

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

  reply	other threads:[~2020-08-17 13:00 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200814113933.1903438-1-lee.jones@linaro.org>
2020-08-14 11:39 ` [PATCH 05/30] net: wireless: atmel: atmel: Demote non-kerneldoc header to standard comment block Lee Jones
2020-08-27 12:16   ` [PATCH 05/30] " Kalle Valo
2020-08-14 11:39 ` [PATCH 07/30] net: wireless: broadcom: b43: main: Add braces around empty statements Lee Jones
2020-08-14 15:12   ` Kalle Valo
2020-08-14 16:43     ` Lee Jones
2020-08-14 17:25       ` Kalle Valo
2020-08-17  8:50         ` Lee Jones
2020-08-27  7:42           ` Kalle Valo
2020-08-27  8:49             ` Lee Jones
2020-08-14 11:39 ` [PATCH 08/30] net: wireless: ath: carl9170: Mark 'ar9170_qmap' as __maybe_unused Lee Jones
2020-08-14 15:14   ` Christian Lamparter
2020-08-14 16:40     ` Lee Jones
2020-08-14 17:25       ` Christian Lamparter
2020-08-17  8:43         ` Lee Jones
2020-08-17  8:26     ` Rasmus Villemoes
2020-08-17 12:59       ` Kalle Valo [this message]
2020-08-17 18:29         ` Christian Lamparter
2020-08-18  9:50         ` Lee Jones
2020-08-27  7:54           ` Kalle Valo
2020-08-27  9:33   ` [PATCH v2 08/30] net: wireless: ath: carl9170: Convert 'ar9170_qmap' to inline function Lee Jones
2020-08-28 20:28     ` Christian Lamparter
2020-08-31 13:56       ` Kalle Valo
2020-08-31 15:19     ` Kalle Valo
2020-08-14 11:39 ` [PATCH 09/30] net: wireless: ath: ath5k: pcu: Add a description for 'band' remove one for 'mode' Lee Jones
2020-08-17 10:20   ` Kalle Valo
2020-08-14 11:39 ` [PATCH 11/30] net: wireless: cisco: airo: Place brackets around empty statement Lee Jones
2020-08-14 11:39 ` [PATCH 12/30] net: wireless: cisco: airo: Fix a myriad of coding style issues Lee Jones
2020-08-14 15:15   ` Kalle Valo
2020-08-14 16:38     ` Lee Jones
2020-08-17 13:27       ` Kalle Valo
2020-08-17 18:27         ` Jesse Brandeburg
2020-08-17 20:04           ` Lee Jones
2020-08-17 21:35           ` Ondrej Zary
2020-08-27  7:49             ` Kalle Valo
2020-08-27 20:23               ` Ondrej Zary
2020-08-28  8:59                 ` Kalle Valo
2020-08-28 10:08                   ` Lee Jones
2020-08-28 12:37                     ` Kalle Valo
2020-08-28 21:34                   ` Ondrej Zary
2020-08-14 11:39 ` [PATCH 13/30] net: wireless: ath: wil6210: cfg80211: Demote non-kerneldoc headers to standard comment blocks Lee Jones
2020-08-14 11:39 ` [PATCH 14/30] net: wireless: intel: iwlegacy: common: Remove set but not used variable 'len' Lee Jones
2020-08-14 11:39 ` [PATCH 15/30] net: wireless: intel: iwlegacy: common: Demote kerneldoc headers to standard comment blocks Lee Jones
2020-08-14 11:39 ` [PATCH 16/30] net: wireless: intel: ipw2200: Remove set but unused variables 'rc' and 'w' Lee Jones
2020-08-14 11:39 ` [PATCH 17/30] net: wireless: broadcom: b43legacy: main: Provide braces around empty 'if' body Lee Jones
2020-08-14 11:39 ` [PATCH 20/30] net: wireless: ath: ath5k: base: Fix kerneldoc formatting issue Lee Jones
2020-08-14 11:39 ` [PATCH 22/30] net: wireless: broadcom: brcm80211: brcmfmac: fweh: Remove set but unused variable 'err' Lee Jones
2020-08-14 11:39 ` [PATCH 23/30] net: wireless: broadcom: brcm80211: brcmfmac: fweh: Fix docrot related function documentation issues Lee Jones
2020-08-14 11:39 ` [PATCH 24/30] net: wireless: broadcom: brcm80211: brcmsmac: mac80211_if: Demote a few non-conformant kerneldoc headers Lee Jones
2020-08-14 11:39 ` [PATCH 25/30] net: wireless: intel: ipw2x00: ipw2200: Demote lots of nonconformant kerneldoc comments Lee Jones
2020-08-14 11:39 ` [PATCH 26/30] net: wireless: broadcom: b43: phy_common: Demote non-conformant kerneldoc header Lee Jones
     [not found]   ` <CAJrvBf00yQQ7F1p1utBuq1oWc2RwnqXijBjaJ+FuxG0mS0TvOA@mail.gmail.com>
2020-08-14 16:36     ` Lee Jones
2020-08-17  8:06   ` Rafał Miłecki
2020-08-17  9:11     ` Lee Jones
2020-08-14 11:39 ` [PATCH 30/30] net: wireless: broadcom: b43: phy_n: Add empty braces around empty statements Lee Jones
     [not found] ` <87eeo88pdr.fsf@tynnyri.adurom.net>
2020-08-17  8:16   ` [PATCH 00/30] Rid W=1 warnings in Networking Lee Jones

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