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a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=CzHoT40cY1VJeb9ybtWOjX4DcXitPrGtk3Iq0cJeFks=; b=alVhp5ITKdWS+1qdqWvHe//FNhBpHf7qZvuzYlUxPKA4/tGfk7N0wZtAVraOFL6g34y7DHFsgcQdy8XxHLwh74s4SYTSGQdPAwqAzB6k1jGQdpcjCFmK9Q9FLPrAAQjN+PYa6lHqG+tUcJyF+mX7PP6R2EV4id1wXJrMARSl3xD/2BBLAU4FFD/Ud6CFsecngHZDAe2Sh6qPoA9SIfsa2FTg0giv0yMFkRFweR8xH9KqCanZrEYHBxQhO/W9/3/l3jTN5st5eAh+2HeUkF9teCHoMbBV+OIaqNOpeJ4QBakvEzAsi4Fsh/LdkjC50AlIq+VisR0fugG5VmuY8vNulA== X-Mailman-Original-Authentication-Results: smtp4.osuosl.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com X-Mailman-Original-Authentication-Results: smtp4.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=alVhp5IT X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Subject: Re: [Intel-wired-lan] [PATCH 2/3] ice: use bitmap_weighted_xor() in ice_find_free_recp_res_idx() X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Yury Norov via Intel-wired-lan Reply-To: Yury Norov Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Tue, Dec 23, 2025 at 07:08:46PM +0000, David Laight wrote: > On Tue, 23 Dec 2025 11:23:01 -0500 > "Yury Norov (NVIDIA)" wrote: > > > Use the right helper and save one bitmaps traverse. > > It makes no difference here. No it makes. > The bitmap has 48 entries and is just a single 'long' on 64bit. > It is also already in a very slow path that has iterated all the > 'set' bit of two bitmaps. > > The code is also pretty convoluted and confusing already. > One of the other bitmaps has 64 entries, recoding using u64 would > make it a bit more readable. > > Doing the 'weight' here is also just optimising for failure. We've introduced bitmap_weighted_or() recently, and now we need to add siblings to the new sub-class. Regardless of performance impact in this case, having a dedicated helper for a typical operations saves a lot in debugging. This is proven by decades of code development. > Oh, and using u8 and u16 for function parameters, return values and > maths requires extra instructions and is usually a bad idea. Changing function signatures is not the patch purpose. Feel free to submit a separate patch. > Dvaid > > > > > Signed-off-by: Yury Norov (NVIDIA) > > --- > > drivers/net/ethernet/intel/ice/ice_switch.c | 4 +--- > > 1 file changed, 1 insertion(+), 3 deletions(-) > > > > diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c > > index 84848f0123e7..903417477929 100644 > > --- a/drivers/net/ethernet/intel/ice/ice_switch.c > > +++ b/drivers/net/ethernet/intel/ice/ice_switch.c > > @@ -4984,10 +4984,8 @@ ice_find_free_recp_res_idx(struct ice_hw *hw, const unsigned long *profiles, > > hw->switch_info->recp_list[bit].res_idxs, > > ICE_MAX_FV_WORDS); > > > > - bitmap_xor(free_idx, used_idx, possible_idx, ICE_MAX_FV_WORDS); > > - > > /* return number of free indexes */ > > - return (u16)bitmap_weight(free_idx, ICE_MAX_FV_WORDS); > > + return (u16)bitmap_weighted_xor(free_idx, used_idx, possible_idx, ICE_MAX_FV_WORDS); > > } > > > > /**