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Tue, 02 Sep 2025 04:59:22 -0700 (PDT) From: Bartosz Golaszewski Date: Tue, 02 Sep 2025 13:59:11 +0200 Subject: [PATCH v7 02/16] devres: provide devm_kmemdup_const() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250902-pinctrl-gpio-pinfuncs-v7-2-bb091daedc52@linaro.org> References: <20250902-pinctrl-gpio-pinfuncs-v7-0-bb091daedc52@linaro.org> In-Reply-To: <20250902-pinctrl-gpio-pinfuncs-v7-0-bb091daedc52@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. 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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=2225; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=/fPVmazhQjlUCOZ/s2UWyZhfkrmgQ0oqqeO6j82ecPA=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBottwSqkj5THulrOPioeZfQvwHNm2obXZdlx73n rLgQ+gp18SJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaLbcEgAKCRARpy6gFHHX cicBEACBSsEN+zHGYUqQzH0L1fVuUR4Uyab1CeLWPuBlfFDOeIdpOAiAwQMbodQXN0tUpDtsdfE td+XDUygwggIWKTi8v2mOwA6u592fDxYytsIYAIKlwnxlylnU1dq0YsxtPM2jn0E12ksyZRhxRZ fUAmR0hg5A/YXoadpFnbYagOSaf2hU+jiUmL4f4K+ypadqW1bAlVSzT6gI1r0pMJYfh7/3yX0PY YG5m0U1+PTJ7m3EfG8+corSJRAS78Sh2FtPt6tkxA7SvyTZCtkF+9hE6cIDbwl+EePrpvN350H7 EFf+SVimrXeowCmoBm3yNNB1NmuPdUpEfzD5NZKO5RNzpC43CqCeDbSGBcJ0mJbKZ25CxZfucRO qSqYqC705VQLTtzvva16XMEqe9r+MoAoLj8CRWuiZqQ9X6/Q5UsCNHlK1x3nPumfgoDNaUvz45z Ag5VkkTMHChrka1WySas247IzRPM0u0mdh6XwAooEFp1tu73+eXbgiljzYdlNrgwFRfTawxE8Yj leay7ODBWo8jv5tzc2mdo2FJx7d3gfD7s0sqbn6ynztvSoE77DkPLxqZJOW+LO43En0NrOYz7w0 5QL1qvQD9C/lNGCMdrGAQxAR68tpaPC8h6+FTYhcH0YAaO+EbJVergnm02z7RlL4YUSmUYKfxPq 1bB7j/qtQY97tcg== 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 Acked-by: Greg Kroah-Hartman Tested-by: Neil Armstrong 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..c948c88d395607ff511ffa6eb0a= 75b7847ab9239 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -1117,6 +1117,27 @@ void *devm_kmemdup(struct device *dev, const void *s= rc, size_t len, gfp_t gfp) } EXPORT_SYMBOL_GPL(devm_kmemdup); =20 +/** + * devm_kmemdup_const - conditionally duplicate and manage a region of mem= ory + * + * @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 kmemd= up() + * 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..8c5f57e0d613492fd0b2ec97dd3= 84181608192fc 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); =20 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) { --=20 2.48.1