From d364d2ad07873dc4991b2a631a8536597272418b Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Tue, 2 Sep 2025 13:59:11 +0200 Subject: devres: provide devm_kmemdup_const() 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 Signed-off-by: Linus Walleij --- drivers/base/devres.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'drivers/base/devres.c') diff --git a/drivers/base/devres.c b/drivers/base/devres.c index ff55e1bcfa30..c948c88d3956 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; -- cgit v1.2.3