From: Joao Martins <joao.m.martins@xxxxxxxxxx> 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@xxxxxxxxxx> Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@xxxxxxxxxx Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> --- 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))
