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Tue, 5 May 2026 04:29:48 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 X-ThreadId: A79HWrF7w_-Z Date: Tue, 05 May 2026 10:29:28 +0200 From: "Arnd Bergmann" To: "Rosen Penev" Cc: linux-mm@kvack.org, "Greg Kroah-Hartman" , "Andrew Morton" , "David Hildenbrand (Red Hat)" , "Lorenzo Stoakes" , "Liam R. Howlett" , "Vlastimil Babka (SUSE)" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Nathan Chancellor" , "Nick Desaulniers" , "Bill Wendling" , "Justin Stitt" , "open list" , "open list:CLANG/LLVM BUILD SUPPORT:Keyword:b(?i:clang|llvm)b" Message-Id: In-Reply-To: References: <20260505010112.645361-1-rosenp@gmail.com> <0f11390f-e8bd-4f8d-aea8-59ef545b2c32@app.fastmail.com> Subject: Re: [PATCH] mm: move phys_mem_access_prot_allowed to header Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 076E040006 X-Stat-Signature: dh4er5ty57yz1aia3q4dmnxm9uryq1ht X-Rspam-User: X-HE-Tag: 1777969790-856118 X-HE-Meta: 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 p1fDYo4B 1nM/gSSLnWOTePCy42fEaB2T4k3ujHRk34mFIimxL8i2lVO2sCMdikeUAbCKCP1LsB3Df3wMV/4fzxaQn2O7EPX4sF2rWObsVtrWhdUVAHTJEK23JcLgBB4/kk4zaLRqJw2Orgk7ll+4ryxZtbGrZGVL/jZEN/ual2QCCe7IdGzB6a/1Qcw2Zo7RpL6AKYsq2PtFxN7R2bfUIQbSnbPgYKUfCeY5lHIDv8ylqIw8vXQYn5cjRXzfTCBkfXLGVpK7Fw+C5Un7fFXdI2B4T9YpVP3OCZaJbtKXV3ISYmPUtfLV6lUoktTHqGJzlTWvEtNQco7GDBRPJzt77acP0jn6vjMV8vXK4yFlN7f984McgxF5pyPUSfYSfL9F6LlSst+zQfxGNUt7BPCm1ppngxPnokaq0VLMnnYKYyy//gPP220pi47w= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, May 5, 2026, at 09:47, Rosen Penev wrote: > On Mon, May 4, 2026 at 10:54=E2=80=AFPM Arnd Bergmann = wrote: >> >> On Tue, May 5, 2026, at 03:01, Rosen Penev wrote: >> > phys_mem_access_prot_allowed is only implemented for X86. For other= s, it >> > returns 1. Move it to header to avoid using __weak. >> > >> > Fixes compilation with make LLVM=3D1 ARCH=3Dmips >> >> Can you describe what exactly goes wrong here on mips? > Cannot find symbol for section 4: .text.phys_mem_access_prot_allowed. > drivers/char/mem.o: failed > > It's full of similar errors in drivers/pci/ as well. clang on MIPS > doesn't seem to like __weak. This certainly feels like a toolchain bug. I would not mind having the PCI code converted away from the __weak functions, but it should not just fail with a linker error like this. Does this happen with both ld.bfd and ld.lld? Which version of clang and lld are you using?=20 Arnd