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bc0d0d093b
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>
32 lines
715 B
C
32 lines
715 B
C
/*
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* Copyright (c) 2015, Christoph Hellwig.
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* Copyright (c) 2015, Intel Corporation.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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static int found(u64 start, u64 end, void *data)
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{
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return 1;
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}
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static __init int register_e820_pmem(void)
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{
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char *pmem = "Persistent Memory (legacy)";
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struct platform_device *pdev;
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int rc;
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rc = walk_iomem_res(pmem, IORESOURCE_MEM, 0, -1, NULL, found);
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if (rc <= 0)
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return 0;
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/*
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* See drivers/nvdimm/e820.c for the implementation, this is
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* simply here to trigger the module to load on demand.
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*/
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pdev = platform_device_alloc("e820_pmem", -1);
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return platform_device_add(pdev);
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}
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device_initcall(register_e820_pmem);
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