+ resource-make-alloc_free_mem_region-works-for-iomem_resource.patch added to mm-unstable branch

+ resource-make-alloc_free_mem_region-works-for-iomem_resource.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: resource: make alloc_free_mem_region() works for iomem_resource
has been added to the -mm mm-unstable branch.  Its filename is
     resource-make-alloc_free_mem_region-works-for-iomem_resource.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/resource-make-alloc_free_mem_region-works-for-iomem_resource.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Huang Ying <ying.huang@intel.com>
Subject: resource: make alloc_free_mem_region() works for iomem_resource
Date: Fri, 6 Sep 2024 11:07:12 +0800

During developing a kunit test case for region_intersects(), some fake
resources need to be inserted into iomem_resource.  To do that, a resource
hole needs to be found first in iomem_resource.

However, alloc_free_mem_region() cannot work for iomem_resource now. 
Because the start address to check cannot be 0 to detect address wrapping
0 in gfr_continue(), while iomem_resource.start == 0.  To make
alloc_free_mem_region() works for iomem_resource, gfr_start() is changed
to avoid to return 0 even if base->start == 0.  We don't need to check 0
as start address.

Link: https://lkml.kernel.org/r/20240906030713.204292-3-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/resource.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/resource.c~resource-make-alloc_free_mem_region-works-for-iomem_resource
+++ a/kernel/resource.c
@@ -1872,7 +1872,7 @@ static resource_size_t gfr_start(struct
 		return end - size + 1;
 	}
 
-	return ALIGN(base->start, align);
+	return ALIGN(max(base->start, align), align);
 }
 
 static bool gfr_continue(struct resource *base, resource_size_t addr,
_

Patches currently in -mm which might be from ying.huang@intel.com are

resource-fix-region_intersects-vs-add_memory_driver_managed.patch
resource-make-alloc_free_mem_region-works-for-iomem_resource.patch
resource-kunit-add-test-case-for-region_intersects.patch