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Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1w0HNy-0000000GmSP-1xvV; Wed, 11 Mar 2026 11:05:54 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 395B8300462; Wed, 11 Mar 2026 12:05:53 +0100 (CET) Date: Wed, 11 Mar 2026 12:05:53 +0100 From: Peter Zijlstra To: Maciej Wieczor-Retman Cc: urezki@gmail.com, ryan.roberts@arm.com, kevin.brodsky@arm.com, samuel.holland@sifive.com, dave.hansen@linux.intel.com, jeremy.linton@arm.com, weixugc@google.com, ljs@kernel.org, ryabinin.a.a@gmail.com, rppt@kernel.org, bp@alien8.de, luto@kernel.org, jan.kiszka@siemens.com, mingo@redhat.com, david@kernel.org, mhocko@suse.com, akpm@linux-foundation.org, andreas@gaisler.com, kas@kernel.org, Liam.Howlett@oracle.com, morbo@google.com, thuth@redhat.com, catalin.marinas@arm.com, ankur.a.arora@oracle.com, kbingham@kernel.org, nick.desaulniers+lkml@gmail.com, andreyknvl@gmail.com, dvyukov@google.com, corbet@lwn.net, leitao@debian.org, hpa@zytor.com, tglx@kernel.org, yuanchu@google.com, ardb@kernel.org, vincenzo.frascino@arm.com, tabba@google.com, joey.gouly@arm.com, nsc@kernel.org, will@kernel.org, yeoreum.yun@arm.com, nathan@kernel.org, maciej.wieczor-retman@intel.com, skhan@linuxfoundation.org, axelrasmussen@google.com, osandov@fb.com, surenb@google.com, justinstitt@google.com, kees@kernel.org, vbabka@kernel.org, hsj0512@snu.ac.kr, trintaeoitogc@gmail.com, jackmanb@google.com, maz@kernel.org, glider@google.com, linux-doc@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, workflows@vger.kernel.org, llvm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v11 00/15] kasan: x86: arm64: KASAN tag-based mode for x86 Message-ID: <20260311110553.GM606826@noisy.programming.kicks-ass.net> References: <20260310190022.GI606826@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: workflows@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: On Tue, Mar 10, 2026 at 07:30:36PM +0000, Maciej Wieczor-Retman wrote: > On 2026-03-10 at 20:00:22 +0100, Peter Zijlstra wrote: > >On Tue, Mar 10, 2026 at 05:51:19PM +0000, Maciej Wieczor-Retman wrote: > > > >> ======= Compilation > >> Clang was used to compile the series (make LLVM=1) since gcc doesn't > >> seem to have support for KASAN tag-based compiler instrumentation on > >> x86. Patchset does seem to compile with gcc without an issue but doesn't > >> boot afterwards. > > > >Can you put all that under a specific CONFIG and make that depend on > >CC_IS_CLANG? > > I made HAVE_ARCH_KASAN_SW_TAGS depend on CC_IS_CLANG, and that controls all the > software tags stuff, like ARCH_DISABLE_KASAN_INLINE through KASAN_SW_TAGS. > And ARCH_NEEDS_DEFER_KASAN is for if KASAN is compiled but LAM is not available, > so that it gets disabled in runtime. > > But sure, I suppose I can add a separate CONFIG with CC_IS_CLANG to these three > so the clang connection is more transparent. Right, because building but not booting is BAD :-) While compiler specific features are a dime a dozen.