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Sun, 27 Sep 2026 07:00:06 -0700 (PDT) From: Danish Khateeb To: u.kleine-koenig@baylibre.com Cc: Danish Khateeb , gregkh@linuxfoundation.org, jirislaby@kernel.org, andriy.shevchenko@linux.intel.com, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org Subject: Re: [PATCH] serial: 8250: Fix section mismatch with CONFIG_MODULES=n Date: Sun, 27 Sep 2026 09:00:05 -0500 Message-ID: <20260927140005.28291-1-danishkhateeb03@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: References: <20260926163506.487201-1-danishkhateeb03@gmail.com> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello Uwe, On Sat, Sep 26, 2026 at 07:40:03PM +0200, Uwe Kleine-König wrote: > Isn't that a false positive because with CONFIG_MODULES=n .exit is > discarded and so the section mismatch doesn't matter? Yes, it's harmless at runtime, but modpost still warns on every CONFIG_MODULES=n build with SERIAL_8250_PNP (e.g. kunit.py --alltests), and the build fails with CONFIG_SECTION_MISMATCH_WARN_ONLY=n. > I thought __init_or_module was the right annotation ... It is, modpost just doesn't know that. Without it the two helpers stay in memory after boot, 16 bytes each on x86_64. The alternative is teaching modpost to skip exit -> init references in vmlinux when CONFIG_MODULES=n. Thanks Danish