forked from mirrors/linux
a6c7f4c6ae
Platform firmware like EFI/ACPI may publish "hmem" platform devices. Such a device is a performance differentiated memory range likely reserved for an application specific use case. The driver gives access to 100% of the capacity via a device-dax mmap instance by default. However, if over-subscription and other kernel memory management is desired the resulting dax device can be assigned to the core-mm via the kmem driver. This consumes "hmem" devices the producer of "hmem" devices is saved for a follow-on patch so that it can reference the new CONFIG_DEV_DAX_HMEM symbol to gate performing the enumeration work. Reported-by: kbuild test robot <lkp@intel.com> Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
23 lines
403 B
C
23 lines
403 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MEMREGION_H_
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#define _MEMREGION_H_
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#include <linux/types.h>
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#include <linux/errno.h>
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struct memregion_info {
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int target_node;
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};
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#ifdef CONFIG_MEMREGION
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int memregion_alloc(gfp_t gfp);
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void memregion_free(int id);
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#else
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static inline int memregion_alloc(gfp_t gfp)
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{
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return -ENOMEM;
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}
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void memregion_free(int id)
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{
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}
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#endif
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#endif /* _MEMREGION_H_ */
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