From patchwork Thu Feb 15 14:46:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Desnoyers X-Patchwork-Id: 13558568 Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 70A1E131E5F; Thu, 15 Feb 2024 14:46:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=167.114.26.122 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708008402; cv=none; b=SKwnTpEE6jFUaDZND2Vrozy1bCKegBHZ4ywZtXsWJwps5RvfCi5ZMjntrGVcnFFv+sb5p9+g+MNpEA1HNqE8ZBsz0CYDorMjO/cC1c1Ne2UleWGeT2Vyo643AXbOdx4i3FWHb5eNH4wdIqZV3GlcJvoJX/IXMIzyyVDrhb1bAoo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708008402; c=relaxed/simple; bh=f6KZPJbWgKyyz0b6bsXitRwjRbgNq1j+uFNk2EI6GFg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=M8phvak2kbA1kwbQ+8Lb50G6S2K7G2Km0k1WkyTlyNsdZwTD8dUVZXF8qdO/PSY/Nvk7xs9aMFfsCd0O16ZIO7bQs0TeJ8pTVqknQBoS7r6prrk83rL4gqe7EWzJ022q172xyRk/ubLNwPs2gJpC10s83xo8SAeQNsbW1up9ckA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com; spf=pass smtp.mailfrom=efficios.com; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b=MNMKriyf; arc=none smtp.client-ip=167.114.26.122 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=efficios.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b="MNMKriyf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1708008399; bh=f6KZPJbWgKyyz0b6bsXitRwjRbgNq1j+uFNk2EI6GFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MNMKriyfcEhRm3Te0E403P2pXoUgE6mM/5Pp6kXzsoZglAnPXNbbPg16ZVmSau0ur reW5SfChm8Z0470OkoRns543xWrIs3en3Il/nnNDyiWEhHDMLbnNNjcxq4LgSOxrhI mXTAeAf44m6ePTpHEwbZ8zApxSVmjU4mK6q5ngf9/4TWEVjKo8Lxm0jXC7BWIceNWZ sAKMnrvZ1jrWUgaJsMpZ7Ju8+Y91gxRxapWNLNNW2Nhr9seT1OfvYZvlM1tdd+VYUB tn+cV4j3qI2QqFdOah9ub9xIKOK1W79zDjPl5rd69ShO+twx+08NeOjS5tHOGjbcEK nuqG3RHuBrRXQ== Received: from thinkos.internal.efficios.com (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4TbHvM1tL3zZS4; Thu, 15 Feb 2024 09:46:39 -0500 (EST) From: Mathieu Desnoyers To: Dan Williams , Arnd Bergmann , Dave Chinner Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Andrew Morton , Linus Torvalds , Vishal Verma , Dave Jiang , Matthew Wilcox , Russell King , linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, dm-devel@lists.linux.dev, nvdimm@lists.linux.dev, linux-s390@vger.kernel.org, kernel test robot , Christoph Hellwig Subject: [PATCH v6 1/9] dax: add empty static inline for CONFIG_DAX=n Date: Thu, 15 Feb 2024 09:46:25 -0500 Message-Id: <20240215144633.96437-2-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240215144633.96437-1-mathieu.desnoyers@efficios.com> References: <20240215144633.96437-1-mathieu.desnoyers@efficios.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When building a kernel with CONFIG_DAX=n, all uses of set_dax_nocache() and set_dax_nomc() need to be either within regions of code or compile units which are explicitly not compiled, or they need to rely on compiler optimizations to eliminate calls to those undefined symbols. It appears that at least the openrisc and loongarch architectures don't end up eliminating those undefined symbols even if they are provably within code which is eliminated due to conditional branches depending on constants. Implement empty static inline functions for set_dax_nocache() and set_dax_nomc() in CONFIG_DAX=n to ensure those undefined references are removed. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202402140037.wGfA1kqX-lkp@intel.com/ Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202402131351.a0FZOgEG-lkp@intel.com/ Fixes: 7ac5360cd4d0 ("dax: remove the copy_from_iter and copy_to_iter methods") Signed-off-by: Mathieu Desnoyers Cc: Christoph Hellwig Cc: Andrew Morton Cc: Linus Torvalds Cc: Dan Williams Cc: Vishal Verma Cc: Dave Jiang Cc: Matthew Wilcox Cc: Arnd Bergmann Cc: Russell King Cc: linux-arch@vger.kernel.org Cc: linux-cxl@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-xfs@vger.kernel.org Cc: dm-devel@lists.linux.dev Cc: nvdimm@lists.linux.dev --- include/linux/dax.h | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/include/linux/dax.h b/include/linux/dax.h index b463502b16e1..e3ffe7c7f01d 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -63,6 +63,8 @@ void kill_dax(struct dax_device *dax_dev); void dax_write_cache(struct dax_device *dax_dev, bool wc); bool dax_write_cache_enabled(struct dax_device *dax_dev); bool dax_synchronous(struct dax_device *dax_dev); +void set_dax_nocache(struct dax_device *dax_dev); +void set_dax_nomc(struct dax_device *dax_dev); void set_dax_synchronous(struct dax_device *dax_dev); size_t dax_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); @@ -109,6 +111,12 @@ static inline bool dax_synchronous(struct dax_device *dax_dev) { return true; } +static inline void set_dax_nocache(struct dax_device *dax_dev) +{ +} +static inline void set_dax_nomc(struct dax_device *dax_dev) +{ +} static inline void set_dax_synchronous(struct dax_device *dax_dev) { } @@ -124,9 +132,6 @@ static inline size_t dax_recovery_write(struct dax_device *dax_dev, } #endif -void set_dax_nocache(struct dax_device *dax_dev); -void set_dax_nomc(struct dax_device *dax_dev); - struct writeback_control; #if defined(CONFIG_BLOCK) && defined(CONFIG_FS_DAX) int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk);