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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42f7cbfeae9sm30973774f8f.13.2025.12.09.01.44.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Dec 2025 01:44:35 -0800 (PST) Date: Tue, 9 Dec 2025 09:44:33 +0000 From: David Laight To: Mika Westerberg Cc: Yury Norov , Rasmus Villemoes , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Geert Uytterhoeven , Alexandre Belloni , Jonathan Cameron , Crt Mori , Richard Genoud , Andy Shevchenko , Luo Jie , Peter Zijlstra , Jakub Kicinski , netdev@vger.kernel.org, "David S . Miller" , Simon Horman , Andreas Noever , Yehezkel Bernat Subject: Re: [PATCH 0/9] bitfield: tidy up bitfield.h Message-ID: <20251209094433.768a76ae@pumpkin> In-Reply-To: <20251209070806.GB2275908@black.igk.intel.com> References: <20251208224250.536159-1-david.laight.linux@gmail.com> <20251209070806.GB2275908@black.igk.intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 9 Dec 2025 08:08:06 +0100 Mika Westerberg wrote: > Hi David, > > On Mon, Dec 08, 2025 at 10:42:41PM +0000, david.laight.linux@gmail.com wrote: > > From: David Laight > > > > I noticed some very long (18KB) error messages from the compiler. > > Turned out they were errors on lines that passed GENMASK() to FIELD_PREP(). > > Since most of the #defines are already statement functions the values > > can be copied to locals so the actual parameters only get expanded once. > > > > The 'bloat' is reduced further by using a simple test to ensure 'reg' > > is large enough, slightly simplifying the test for constant 'val' and > > only checking 'reg' and 'val' when the parameters are present. > > > > The first two patches are slightly problematic. > > > > drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c manages to use > > a #define that should be an internal to bitfield.h, the changed file > > is actually more similar to the previous version. > > > > drivers/thunderbolt/tb.h passes a bifield to FIELD_GET(), these can't > > be used with sizeof or __auto_type. The usual solution is to add zero, > > but that can't be done in FIELD_GET() because it doesn't want the value > > promoted to 'int' (no idea how _Generic() treated it.) > > The fix is just to add zero at the call site. > > (The bitfield seems to be in a structure rad from hardware - no idea > > how that works on BE (or any LE that uses an unusual order for bitfields.) > > Okay but can you CC me the actual patch too? I only got the cover letter > ;-) Ah, sorry I'd changed the git settings.. I'll resend it all. David