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Tue, 12 Aug 2025 01:27:09 -0700 (PDT) From: Bartosz Golaszewski Date: Tue, 12 Aug 2025 10:27:00 +0200 Subject: [PATCH v4 01/15] devres: provide devm_kmemdup_const() Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250812-pinctrl-gpio-pinfuncs-v4-1-bb3906c55e64@linaro.org> References: <20250812-pinctrl-gpio-pinfuncs-v4-0-bb3906c55e64@linaro.org> In-Reply-To: <20250812-pinctrl-gpio-pinfuncs-v4-0-bb3906c55e64@linaro.org> To: Linus Walleij , Bjorn Andersson , Konrad Dybcio , Alexey Klimov , Lorenzo Bianconi , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Paul Cercueil , Kees Cook , Andy Shevchenko , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Dong Aisheng , Fabio Estevam , Shawn Guo , Jacky Bai , Pengutronix Kernel Team , NXP S32 Linux Team , Sascha Hauer , Tony Lindgren , Haojian Zhuang , Geert Uytterhoeven , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, imx@lists.linux.dev, linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2063; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=Igk+yDN8BP1JkTjLlRhKQ7SRJ5My7JH94ZAwq+/yocg=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBomvrWHo270jKNT7TR30vMTLvJtquAQ8DkFhjQc ewt3zLD8DaJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaJr61gAKCRARpy6gFHHX cjXuEADPonktCGWYlKywp9d3HO63lp5DL98Fa5df96en6tECd7hEXtS99i9LAByEf9gB+XIzpYT bn7HKsMznjan6cqY/js2/PmDrnfrTaS8GMTWnnVOxndSGotuSFmQ3zk2ssQIvblDxvtxEK/VfWs Xorx6opZLXirGk7awxEDwydn2R24ZBfAv4HNzCaPxdZDR5jPuBK3Y2Sz9Z7zxOLkgCA/dFSI/VC EiaB0QwENlBXLbDTWm+FBJKFkgyLBaaelM7rRmgWagtEkB6QDH4aDB2BeQn46Fwrx5thDVEjHzS fyE7pWZD/eVoSgnClKMYjtwFSECf860vmV3a0SYw2OQWjdtR6GDu3H9s05ASNdUyHuSY4YiLG9n JVpnETaTHpb9lSDi3vb0asDKaLIcBMaBkG4dWOWsNqs5Z91/qSP1KRMVbnpNI91WMeQ2as7u3Cd m8zJYNga6cC9JfwhC+54Q4ijTmVTGa6tqyxkNqWlsEm7M5jjCpIRR07fAODaqKv3MIgXA//89QS iCwpz0h208VuntqHpkRusRFTEDihMX9aqBRpvGkYLphyCcDXTK5bT1bOhByWDi4UnlmkZGRK8C5 Ciga46g5hgKGVQM1Nkkit1mjBI1xoc0CaHoC4+KXTbzTIormwWsZBSPMKWcYUwOzlpENKo0Z34/ nBWlmLjGY27IFaA== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Provide a function similar to devm_strdup_const() but for copying blocks of memory that are likely to be placed in .rodata. Signed-off-by: Bartosz Golaszewski --- drivers/base/devres.c | 21 +++++++++++++++++++++ include/linux/device/devres.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/base/devres.c b/drivers/base/devres.c index ff55e1bcfa30057849a352c577bd32f1aa196532..c948c88d395607ff511ffa6eb0a75b7847ab9239 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -1117,6 +1117,27 @@ void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp) } EXPORT_SYMBOL_GPL(devm_kmemdup); +/** + * devm_kmemdup_const - conditionally duplicate and manage a region of memory + * + * @dev: Device this memory belongs to + * @src: memory region to duplicate + * @len: memory region length, + * @gfp: GFP mask to use + * + * Return: source address if it is in .rodata or the return value of kmemdup() + * to which the function falls back otherwise. + */ +const void * +devm_kmemdup_const(struct device *dev, const void *src, size_t len, gfp_t gfp) +{ + if (is_kernel_rodata((unsigned long)src)) + return src; + + return devm_kmemdup(dev, src, len, gfp); +} +EXPORT_SYMBOL_GPL(devm_kmemdup_const); + struct pages_devres { unsigned long addr; unsigned int order; diff --git a/include/linux/device/devres.h b/include/linux/device/devres.h index ae696d10faff4468a41f37b5d5fd679d4ff11997..8c5f57e0d613492fd0b2ec97dd384181608192fc 100644 --- a/include/linux/device/devres.h +++ b/include/linux/device/devres.h @@ -80,6 +80,8 @@ void devm_kfree(struct device *dev, const void *p); void * __realloc_size(3) devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp); +const void * +devm_kmemdup_const(struct device *dev, const void *src, size_t len, gfp_t gfp); static inline void *devm_kmemdup_array(struct device *dev, const void *src, size_t n, size_t size, gfp_t flags) { -- 2.48.1