lib/devres.c

Source file repositories/reference/linux-study-clean/lib/devres.c

File Facts

System
Linux kernel
Corpus path
lib/devres.c
Extension
.c
Size
10494 bytes
Lines
400
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

struct arch_io_reserve_memtype_wc_devres {
	resource_size_t start;
	resource_size_t size;
};

static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)
{
	const struct arch_io_reserve_memtype_wc_devres *this = res;

	arch_io_free_memtype_wc(this->start, this->size);
}

/**
 * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()
 * @dev: Managed device
 * @start: Memory base address
 * @size: Size of memory range
 *
 * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()
 * and sets up a release callback See arch_io_reserve_memtype_wc() for more
 * information.
 */
int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
				    resource_size_t size)
{
	struct arch_io_reserve_memtype_wc_devres *dr;
	int ret;

	dr = devres_alloc_node(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL,
			       dev_to_node(dev));
	if (!dr)
		return -ENOMEM;

	ret = arch_io_reserve_memtype_wc(start, size);
	if (ret < 0) {
		devres_free(dr);
		return ret;
	}

	dr->start = start;
	dr->size = size;
	devres_add(dev, dr);

	return ret;
}
EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);

Annotation

Implementation Notes