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730926c3b0
On the expectation that some environments may not upgrade libdaxctl (userspace component that depends on the /sys/class/dax hierarchy), provide a default / legacy dax_pmem_compat driver. The dax_pmem_compat driver implements the original /sys/class/dax sysfs layout rather than /sys/bus/dax. When userspace is upgraded it can blacklist this module and switch to the dax_pmem driver going forward. CONFIG_DEV_DAX_PMEM_COMPAT and supporting code will be deleted according to the dax_pmem entry in Documentation/ABI/obsolete/. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
40 lines
969 B
C
40 lines
969 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
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#include <linux/percpu-refcount.h>
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#include <linux/memremap.h>
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#include <linux/module.h>
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#include <linux/pfn_t.h>
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#include <linux/nd.h>
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#include "../bus.h"
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static int dax_pmem_probe(struct device *dev)
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{
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return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev, DEV_DAX_BUS));
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}
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static struct nd_device_driver dax_pmem_driver = {
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.probe = dax_pmem_probe,
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.drv = {
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.name = "dax_pmem",
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},
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.type = ND_DRIVER_DAX_PMEM,
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};
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static int __init dax_pmem_init(void)
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{
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return nd_driver_register(&dax_pmem_driver);
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}
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module_init(dax_pmem_init);
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static void __exit dax_pmem_exit(void)
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{
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driver_unregister(&dax_pmem_driver.drv);
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}
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module_exit(dax_pmem_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Intel Corporation");
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#if !IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
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/* For compat builds, don't load this module by default */
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MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
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#endif
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