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X-IronPort-AV: E=McAfee;i="6600,9927,10770"; a="365489855" X-IronPort-AV: E=Sophos;i="6.01,205,1684825200"; d="scan'208";a="365489855" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2023 04:28:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10770"; a="787821820" X-IronPort-AV: E=Sophos;i="6.01,205,1684825200"; d="scan'208";a="787821820" Received: from smile.fi.intel.com ([10.237.72.54]) by fmsmga008.fm.intel.com with ESMTP; 14 Jul 2023 04:28:08 -0700 Received: from andy by smile.fi.intel.com with local (Exim 4.96) (envelope-from ) id 1qKGxy-002e4J-2C; Fri, 14 Jul 2023 14:28:06 +0300 Date: Fri, 14 Jul 2023 14:28:06 +0300 From: Andy Shevchenko To: William Breathitt Gray Cc: Alexander Potapenko , catalin.marinas@arm.com, will@kernel.org, pcc@google.com, andreyknvl@gmail.com, linux@rasmusvillemoes.dk, yury.norov@gmail.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, eugenis@google.com Subject: Re: [v2 1/5] lib/bitmap: add bitmap_{set,get}_value_unaligned() Message-ID: References: <20230713125706.2884502-1-glider@google.com> <20230713125706.2884502-2-glider@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 14, 2023 at 07:19:15AM -0400, William Breathitt Gray wrote: > On Fri, Jul 14, 2023 at 11:04:16AM +0300, Andy Shevchenko wrote: > > On Thu, Jul 13, 2023 at 08:05:34PM +0200, Alexander Potapenko wrote: > > > On Thu, Jul 13, 2023 at 7:29 PM Andy Shevchenko > > > wrote: > > > > On Thu, Jul 13, 2023 at 02:57:01PM +0200, Alexander Potapenko wrote: > > > > > The two new functions allow setting/getting values of length up to > > > > > BITS_PER_LONG bits at arbitrary position in the bitmap. > > > > > > > > A couple of years (?) ago it was a series to achieve something like this with > > > > better (?) code. Why not resurrect that one? > > > > > > > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2195426.html > > > > > > It looks more compact thanks to GENMASK, I can cook something based on > > > the proposed bitmap_{set,get}_value (and change the names if you > > > prefer the shorter ones). > > > But I'd better avoid pulling in the rest of that series without a strong need. > > > > William, what do you think on this? > > > > I'm personally prefer William's version as not only it was published first > > it was carefully designed and got a lot of review already. We just hadn't had > > the user for it that time. > > Yes, that version went through several revisions so it's been well > tested and known to work -- as you pointed out it just lacked the users > to warrant merging it into the tree. If it statisfies the use-case > required here now, then I think we should it pick it up rather than > reinvent the solution again. > > Also, we probably don't need the "clump" code in there, so perhaps > splitting it out to just the bitmap_{set,get}_value relevant code is > fine. Agree, thank you for your comments! -- With Best Regards, Andy Shevchenko