The patch titled
Subject: dax/hmem: introduce dax_hmem.region_idle parameter
has been added to the -mm tree. Its filename is
dax-hmem-introduce-dax_hmemregion_idle-parameter.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/dax-hmem-introduce-dax_hmemregion_idle-parameter.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/dax-hmem-introduce-dax_hmemregion_idle-parameter.patch
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------------------------------------------------------
From: Joao Martins <joao.m.martins@xxxxxxxxxx>
Subject: dax/hmem: introduce dax_hmem.region_idle parameter
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.
Link: https://lkml.kernel.org/r/159643106460.4062302.5868522341307530091.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@xxxxxxxxxx
Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brice Goglin <Brice.Goglin@xxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Jia He <justin.he@xxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dax/hmem/hmem.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/dax/hmem/hmem.c~dax-hmem-introduce-dax_hmemregion_idle-parameter
+++ a/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 platfor
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))
_
Patches currently in -mm which might be from joao.m.martins@xxxxxxxxxx are
device-dax-make-align-a-per-device-property.patch
device-dax-add-an-align-attribute.patch
dax-hmem-introduce-dax_hmemregion_idle-parameter.patch
device-dax-add-a-range-mapping-allocation-attribute.patch
