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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8c90c35cdb1sm58747396d6.46.2026.05.15.11.06.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 May 2026 11:06:38 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wNwvm-00000007s92-0MaY; Fri, 15 May 2026 15:06:38 -0300 Date: Fri, 15 May 2026 15:06:38 -0300 From: Jason Gunthorpe To: Arnd Bergmann Cc: Will Deacon , Joerg Roedel , Miguel Ojeda , Andrew Morton , Thomas Gleixner , Nathan Chancellor , Arnd Bergmann , linux-kbuild@vger.kernel.org, stable@vger.kernel.org, Robin Murphy , Kees Cook , linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] [v2] iommu, debugobjects: avoid gcc-16.1 section mismatch warnings Message-ID: <20260515180638.GH7702@ziepe.ca> References: <20260513145425.1579430-1-arnd@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260513145425.1579430-1-arnd@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260515_110640_626156_7AE75722 X-CRM114-Status: GOOD ( 16.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, May 13, 2026 at 04:53:54PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann > > gcc-16 has gained some more advanced inter-procedual optimization > techniques that enable it to inline the dummy_tlb_add_page() and > dummy_tlb_flush() function pointers into a specialized version of > __arm_v7s_unmap: > > WARNING: modpost: vmlinux: section mismatch in reference: __arm_v7s_unmap+0x2cc (section: .text) -> dummy_tlb_add_page (section: .init.text) > ERROR: modpost: Section mismatches detected. > > From what I can tell, the transformation is correct, as this is only > called when __arm_v7s_unmap() is called from arm_v7s_do_selftests(), > which is also __init. Since __arm_v7s_unmap() however is not __init, > gcc cannot inline the inner function calls directly. The selftests should be moved into a kunit like was done for pgtable-arm: commit 699b059962add22b2a324645b6ae2a607fc1a93e Author: Mostafa Saleh Date: Mon Nov 3 12:33:50 2025 +0000 iommu/io-pgtable-arm: Move selftests to a separate file Clean up the io-pgtable-arm library by moving the selftests out. Next the tests will be registered with kunit. Then you won't have these section problems because the code will be in another module :) Jason