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Thu, 28 Aug 2025 09:00:19 -0700 (PDT) From: Bartosz Golaszewski Date: Thu, 28 Aug 2025 18:00:09 +0200 Subject: [PATCH v6 01/15] devres: provide devm_kmemdup_const() Precedence: bulk X-Mailing-List: linux-omap@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250828-pinctrl-gpio-pinfuncs-v6-1-c9abb6bdb689@linaro.org> References: <20250828-pinctrl-gpio-pinfuncs-v6-0-c9abb6bdb689@linaro.org> In-Reply-To: <20250828-pinctrl-gpio-pinfuncs-v6-0-c9abb6bdb689@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 , Neil Armstrong , Mark Brown 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=2111; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=yGM1a+aC0va5PQYzRl7VigwSABEcy8VUGQM8wt+k8EA=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBosH0M6t7kDqohITUHpArt8wxM4j/l0nGheDDz/ lBgFuEny5+JAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaLB9DAAKCRARpy6gFHHX crcbD/96BbYP4iAKgagx1b/SaoRaFXAC/EdEogLQkCvckdWVvEIEZ8Tcr1z720z6HyB9Ba31VkK eV5egMTpHafq/h0riC+6rAxWG3Yb1N/W+bFOh4kMVYLEP4i6IAEsBd9d9XUucbCaHWNolzNAw82 KKUmo7USlAk0HC27fCTmsZZnqVRo1e8oWsvdTBS1A1+6PVPpCUSvm8ucDBKt8GmuW/iEtFk+zVu b+E6wZwWpt/ugBke2tciQKiYcaYz+BmGjgcg/giMss8x6aCa9LvzL/lM+jf0Hyci1OQ/2DEGscb XmSsXN1ycObeXq3vKKy+Ea9IqGk80HW/jaOM38tf8YRVVWwPk34YZuNAqtJb46r7OOTSfPm14/6 2cW7KPby1U2qNtkIA6h33Dpoe+sVrnKNdSv3GL5K+/UYB9FJRAjQ5KwjtDLN4mgzhSMN0Tlg/mR 7gu+PUHHkiTRA32ftkWqtc99guGN5R3eXkDZesJ6GxqMxW9BzbtLDo/EYtmtBSUyF2GwKSoNY4N ncnsxtMEjMPpqpcblxpETio3cmc/R16fhYa6nyINj58teXPUV+yzA3zyK4zNHhFsQJD5m+I1Yv8 kObDI+zPGcSSuBJ8TtNtSrQsJjKKYZ68meo80Zv7c2jEmrvZbjqJqin3Iuc+Bew/4ZuXumx0Oak S/KoHAtfm3cEDcQ== 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. Reviewed-by: Andy Shevchenko 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