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    Subject[PATCH v3 22/23] dax/hmem: Introduce dax_hmem.region_idle parameter
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    From: Joao Martins <joao.m.martins@oracle.com>

    Introduce a new module parameter for dax_hmem which
    initializes all region devices as free, rather than allocating
    a pagemap for the region by default.

    All hmem devices created with dax_hmem.region_idle=1 will have full
    available size for creating dynamic dax devices.

    Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
    Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@oracle.com
    Signed-off-by: Dan Williams <dan.j.williams@intel.com>
    ---
    drivers/dax/hmem/hmem.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
    index 1a3347bb6143..1bf040dbc834 100644
    --- a/drivers/dax/hmem/hmem.c
    +++ b/drivers/dax/hmem/hmem.c
    @@ -5,6 +5,9 @@
    #include <linux/pfn_t.h>
    #include "../bus.h"

    +static bool region_idle;
    +module_param_named(region_idle, region_idle, bool, 0644);
    +
    static int dax_hmem_probe(struct platform_device *pdev)
    {
    struct device *dev = &pdev->dev;
    @@ -30,7 +33,7 @@ static int dax_hmem_probe(struct platform_device *pdev)
    data = (struct dev_dax_data) {
    .dax_region = dax_region,
    .id = -1,
    - .size = resource_size(res),
    + .size = region_idle ? 0 : resource_size(res),
    };
    dev_dax = devm_create_dev_dax(&data);
    if (IS_ERR(dev_dax))
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