From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CCA5B1B413D; Fri, 7 Mar 2025 12:13:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741349623; cv=none; b=ci0xVbc+MYIF7AXBV5F4Mczkh0u0XpTGUv5yyKxPCTbpZeIYRtTwd2cx6dflSt5Co8Yxn2GvgyW3/m6IygGi6scgXJcYDQG37H1GwAjwWhCqxoowvfaPi3xtBuIU5Tx5FFnGh/fH4NryD/b99qPdCNdps1FBeOdE6ztjBsL3K98= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741349623; c=relaxed/simple; bh=A0iB+YCb+UVBZshzVwjPGcV1KlpUOFw1SPgFL2eBkpo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=uoouyaTMfkyPKHPwJ73QdVV5VO8tJMcJJSTc+s78j5lD0WX4L3cEOLIgut7B9hqJ/5nSDG9GHHyNBEzktGQWB5LywgbiCoNSj3YgiJip/fZiA31x2L3nu+hn0b2gsLwRFwVFEpEBX9j3DU05kbTidYxbhI/skNL/z3hBSlLZwOI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fAAKNVwX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fAAKNVwX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C604C4CED1; Fri, 7 Mar 2025 12:13:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741349621; bh=A0iB+YCb+UVBZshzVwjPGcV1KlpUOFw1SPgFL2eBkpo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=fAAKNVwXTNgwLiB5yUVEtuwsAVGV/QIJuDWb7igtxd0P9qswD1E8OeErlDEuR/e4A KzLmqjaEJZEEl8hSt3qCO5bduwmqj7FwIXcOT4tSNTVGxBcAdBk7AWN4yLRQ/mH/Ta NH7IKeh8DSsI6ZQyf5gMsWXFqhAVxHXQBYrvIhW0+UfaCBXrOUm7UjEXrPkF7B1TOK SMzEej6Y5vdB6J5u6wKBSSsXn2sden45AL2Ml53BlqVAWJg8Ls711zuQtM6RIh95+n mN2kfDztpe5dbxCy74QPpzR2QMb4IHiGzh8wu9JEohDHUW7xPD0W/hDCgkdkVGFdrr aEDVYiNNNjX8A== Date: Fri, 7 Mar 2025 13:13:26 +0100 From: Ingo Molnar To: Jiri Slaby Cc: Kuan-Wei Chiu , tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, jk@ozlabs.org, joel@jms.id.au, eajames@linux.ibm.com, andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, dmitry.torokhov@gmail.com, mchehab@kernel.org, awalls@md.metrocast.net, hverkuil@xs4all.nl, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, louis.peens@corigine.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, parthiban.veerasooran@microchip.com, arend.vanspriel@broadcom.com, johannes@sipsolutions.net, gregkh@linuxfoundation.org, yury.norov@gmail.com, akpm@linux-foundation.org, hpa@zytor.com, alistair@popple.id.au, linux@rasmusvillemoes.dk, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-fsi@lists.ozlabs.org, dri-devel@lists.freedesktop.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, linux-mtd@lists.infradead.org, oss-drivers@corigine.com, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, linux-serial@vger.kernel.org, bpf@vger.kernel.org, jserv@ccns.ncku.edu.tw, Yu-Chun Lin Subject: Re: [PATCH v3 01/16] bitops: Change parity8() return type to bool Message-ID: References: <20250306162541.2633025-1-visitorckw@gmail.com> <20250306162541.2633025-2-visitorckw@gmail.com> <9d4b77da-18c5-4551-ae94-a2b9fe78489a@kernel.org> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: * Jiri Slaby wrote: > On 07. 03. 25, 12:38, Ingo Molnar wrote: > > > > * Jiri Slaby wrote: > > > > > On 06. 03. 25, 17:25, Kuan-Wei Chiu wrote: > > > > Change return type to bool for better clarity. Update the kernel doc > > > > comment accordingly, including fixing "@value" to "@val" and adjusting > > > > examples. Also mark the function with __attribute_const__ to allow > > > > potential compiler optimizations. > > > > > > > > Co-developed-by: Yu-Chun Lin > > > > Signed-off-by: Yu-Chun Lin > > > > Signed-off-by: Kuan-Wei Chiu > > > > --- > > > > include/linux/bitops.h | 10 +++++----- > > > > 1 file changed, 5 insertions(+), 5 deletions(-) > > > > > > > > diff --git a/include/linux/bitops.h b/include/linux/bitops.h > > > > index c1cb53cf2f0f..44e5765b8bec 100644 > > > > --- a/include/linux/bitops.h > > > > +++ b/include/linux/bitops.h > > > > @@ -231,26 +231,26 @@ static inline int get_count_order_long(unsigned long l) > > > > /** > > > > * parity8 - get the parity of an u8 value > > > > - * @value: the value to be examined > > > > + * @val: the value to be examined > > > > * > > > > * Determine the parity of the u8 argument. > > > > * > > > > * Returns: > > > > - * 0 for even parity, 1 for odd parity > > > > + * false for even parity, true for odd parity > > > > > > This occurs somehow inverted to me. When something is in parity means that > > > it has equal number of 1s and 0s. I.e. return true for even distribution. > > > Dunno what others think? Or perhaps this should be dubbed odd_parity() when > > > bool is returned? Then you'd return true for odd. > > > > OTOH: > > > > - '0' is an even number and is returned for even parity, > > - '1' is an odd number and is returned for odd parity. > > Yes, that used to make sense for me. For bool/true/false, it no longer does. > But as I wrote, it might be only me... No strong opinion on this from me either, I'd guess existing practice with other parity functions should probably control. (If a coherent praxis exists.). Thanks, Ingo