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Date: Fri, 10 Jun 2022 10:32:13 +0200 (CEST) From: Jan Engelhardt <jengelh@...i.de> To: David Laight <David.Laight@...LAB.COM> cc: 'Bill Wendling' <morbo@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Bill Wendling <isanbard@...il.com>, Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Phillip Potter <phil@...lpotter.co.uk>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Jan Kara <jack@...e.com>, Pablo Neira Ayuso <pablo@...filter.org>, Jozsef Kadlecsik <kadlec@...filter.org>, Florian Westphal <fw@...len.de>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, Ross Philipson <ross.philipson@...cle.com>, Daniel Kiper <daniel.kiper@...cle.com>, "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, ACPI Devel Maling List <linux-acpi@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>, "coreteam@...filter.org" <coreteam@...filter.org>, Networking <netdev@...r.kernel.org>, "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>, clang-built-linux <llvm@...ts.linux.dev> Subject: RE: [PATCH 00/12] Clang -Wformat warning fixes On Friday 2022-06-10 10:17, David Laight wrote: >> >> Calling a "printf" style function is already insanely expensive. :-) I >> understand that it's not okay blithely to increase runtime resources >> simply because it's already slow, but in this case it's worthwhile. > >Yep, IMHO definitely should be fixed. >It is even possible that using "%s" is faster because the printf >code doesn't have to scan the string for format effectors. I see no special handling; the vsnprintf function just loops over fmt as usual and I see no special casing of fmt by e.g. strcmp(fmt, "%s") == 0 to take a shortcut.
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