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@xxxxxxxxx>
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@xxxxxxxxx
Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: Alison Schofield <alison.schofield@xxxxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx 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
