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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: Andy Lutomirski <luto@amacapital.net>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2015-11-30 09:10:33 -08:00
parent 31ade3b83e
commit bc0d0d093b
1 changed files with 12 additions and 0 deletions
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12
arch/x86/kernel/pmem.c
View File

@ -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