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Commit bc0d0d09 authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm, e820: skip module loading when no type-12 



If there are no persistent memory ranges present then don't bother
creating the platform device.  Otherwise, it loads the full libnvdimm
sub-system only to discover no resources present.

Reported-by: default avatarAndy Lutomirski <luto@amacapital.net>
Acked-by: default avatarAndy Lutomirski <luto@amacapital.net>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 31ade3b8

arch/x86/kernel/pmem.c

+12 −0
Original line number Diff line number Diff line
@@ -4,10 +4,22 @@ 
 */

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/ioport.h>



static int found(u64 start, u64 end, void *data)

{

	return 1;

}



static __init int register_e820_pmem(void)

{

	char *pmem = "Persistent Memory (legacy)";

	struct platform_device *pdev;

	int rc;



	rc = walk_iomem_res(pmem, IORESOURCE_MEM, 0, -1, NULL, found);

	if (rc <= 0)

		return 0;



	/*

	 * See drivers/nvdimm/e820.c for the implementation, this is