[038/181] device-dax/kmem: replace release_resource() with release_mem_region()

Commit Message

Andrew Morton Oct. 13, 2020, 11:49 p.m. UTC

From: Dan Williams <[e-mail]>
Subject: device-dax/kmem: replace release_resource() with release_mem_region()

Towards removing the mode specific @dax_kmem_res attribute from the
generic 'struct dev_dax', and preparing for multi-range support, change
the kmem driver to use the idiomatic release_mem_region() to pair with the
initial request_mem_region().  This also eliminates the need to open code
the release of the resource allocated by request_mem_region().

As there are no more dax_kmem_res users, delete this struct member.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Dan Williams <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Vishal Verma <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: Pavel Tatashin <[e-mail]>
Cc: Brice Goglin <[e-mail]>
Cc: Dave Jiang <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Ira Weiny <[e-mail]>
Cc: Jia He <[e-mail]>
Cc: Joao Martins <[e-mail]>
Cc: Jonathan Cameron <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Ard Biesheuvel <[e-mail]>
Cc: Ard Biesheuvel <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Ben Skeggs <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Boris Ostrovsky <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Cc: Hulk Robot <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jason Gunthorpe <[e-mail]>
Cc: Jason Yan <[e-mail]>
Cc: Jeff Moyer <[e-mail]>
Cc: "Jérôme Glisse" <[e-mail]>
Cc: Juergen Gross <[e-mail]>
Cc: kernel test robot <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Mike Rapoport <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Cc: Randy Dunlap <[e-mail]>
Cc: Stefano Stabellini <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Tom Lendacky <[e-mail]>
Cc: Vivek Goyal <[e-mail]>
Cc: Wei Yang <[e-mail]>
Cc: Will Deacon <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 drivers/dax/dax-private.h |    3 ---
 drivers/dax/kmem.c        |   20 +++++++-------------
 2 files changed, 7 insertions(+), 16 deletions(-)

Patch

--- a/drivers/dax/dax-private.h~device-dax-kmem-replace-release_resource-with-release_mem_region
+++ a/drivers/dax/dax-private.h
@@ -42,8 +42,6 @@  struct dax_region {
  * @dev - device core
  * @pgmap - pgmap for memmap setup / lifetime (driver owned)
  * @range: resource range for the instance
- * @dax_mem_res: physical address range of hotadded DAX memory
- * @dax_mem_name: name for hotadded DAX memory via add_memory_driver_managed()
  */
 struct dev_dax {
 	struct dax_region *region;
@@ -52,7 +50,6 @@  struct dev_dax {
 	struct device dev;
 	struct dev_pagemap *pgmap;
 	struct range range;
-	struct resource *dax_kmem_res;
 };
 
 static inline u64 range_len(struct range *range)
--- a/drivers/dax/kmem.c~device-dax-kmem-replace-release_resource-with-release_mem_region
+++ a/drivers/dax/kmem.c
@@ -33,7 +33,7 @@  int dev_dax_kmem_probe(struct device *de
 {
 	struct dev_dax *dev_dax = to_dev_dax(dev);
 	struct range range = dax_kmem_range(dev_dax);
-	struct resource *new_res;
+	struct resource *res;
 	char *res_name;
 	int numa_node;
 	int rc;
@@ -56,8 +56,8 @@  int dev_dax_kmem_probe(struct device *de
 		return -ENOMEM;
 
 	/* Region is permanently reserved if hotremove fails. */
-	new_res = request_mem_region(range.start, range_len(&range), res_name);
-	if (!new_res) {
+	res = request_mem_region(range.start, range_len(&range), res_name);
+	if (!res) {
 		dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end);
 		kfree(res_name);
 		return -EBUSY;
@@ -69,23 +69,20 @@  int dev_dax_kmem_probe(struct device *de
 	 * inherit flags from the parent since it may set new flags
 	 * unknown to us that will break add_memory() below.
 	 */
-	new_res->flags = IORESOURCE_SYSTEM_RAM;
+	res->flags = IORESOURCE_SYSTEM_RAM;
 
 	/*
 	 * Ensure that future kexec'd kernels will not treat this as RAM
 	 * automatically.
 	 */
-	rc = add_memory_driver_managed(numa_node, new_res->start,
-				       resource_size(new_res), kmem_name);
+	rc = add_memory_driver_managed(numa_node, range.start, range_len(&range), kmem_name);
 	if (rc) {
-		release_resource(new_res);
-		kfree(new_res);
+		release_mem_region(range.start, range_len(&range));
 		kfree(res_name);
 		return rc;
 	}
 
 	dev_set_drvdata(dev, res_name);
-	dev_dax->dax_kmem_res = new_res;
 
 	return 0;
 }
@@ -95,7 +92,6 @@  static int dev_dax_kmem_remove(struct de
 {
 	struct dev_dax *dev_dax = to_dev_dax(dev);
 	struct range range = dax_kmem_range(dev_dax);
-	struct resource *res = dev_dax->dax_kmem_res;
 	const char *res_name = dev_get_drvdata(dev);
 	int rc;
 
@@ -114,10 +110,8 @@  static int dev_dax_kmem_remove(struct de
 	}
 
 	/* Release and free dax resources */
-	release_resource(res);
-	kfree(res);
+	release_mem_region(range.start, range_len(&range));
 	kfree(res_name);
-	dev_dax->dax_kmem_res = NULL;
 
 	return 0;
 }