lkml.org 
[lkml]   [2015]   [Nov]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 2/3] resource: Add region_intersects_pmem()
    Date
    Add region_intersects_pmem(), which checks if a specified address
    range is persistent memory registered as "Persistent Memory" in
    the iomem_resource list.

    Note, it does not support legacy persistent memory registered as
    "Persistent Memory (legacy)". It can be supported by extending
    this function or a separate function, if necessary.

    This interface is exported so that it can be called from modules,
    such as the EINJ driver.

    Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
    Reviewed-by: Dan Williams <dan.j.williams@intel.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Vishal Verma <vishal.l.verma@intel.com>
    ---
    include/linux/mm.h | 1 +
    kernel/resource.c | 12 ++++++++++++
    2 files changed, 13 insertions(+)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index c776af3..3825879 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -365,6 +365,7 @@ enum {
    int region_intersects(resource_size_t offset, size_t size, const char *type,
    unsigned long flags);
    int region_intersects_ram(resource_size_t offset, size_t size);
    +int region_intersects_pmem(resource_size_t offset, size_t size);

    /* Support for virtually mapped pages */
    struct page *vmalloc_to_page(const void *addr);
    diff --git a/kernel/resource.c b/kernel/resource.c
    index 15c133e..5230e63 100644
    --- a/kernel/resource.c
    +++ b/kernel/resource.c
    @@ -548,6 +548,18 @@ int region_intersects_ram(resource_size_t start, size_t size)
    }
    EXPORT_SYMBOL_GPL(region_intersects_ram);

    +/*
    + * region_intersects_pmem() checks if a specified address range is
    + * persistent memory, registered as "Persistent Memory", in the
    + * iomem_resource list.
    + */
    +int region_intersects_pmem(resource_size_t start, size_t size)
    +{
    + return region_intersects(start, size, "Persistent Memory",
    + IORESOURCE_MEM);
    +}
    +EXPORT_SYMBOL_GPL(region_intersects_pmem);
    +
    void __weak arch_remove_reservations(struct resource *avail)
    {
    }

    \
     
     \ /
      Last update: 2015-11-24 23:01    [W:4.699 / U:0.052 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site