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Message-Id: <20240906030713.204292-3-ying.huang@intel.com> Date: Fri, 6 Sep 2024 11:07:12 +0800 From: Huang Ying <ying.huang@...el.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org, Huang Ying <ying.huang@...el.com>, Dan Williams <dan.j.williams@...el.com>, David Hildenbrand <david@...hat.com>, Davidlohr Bueso <dave@...olabs.net>, Jonathan Cameron <jonathan.cameron@...wei.com>, Dave Jiang <dave.jiang@...el.com>, Alison Schofield <alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Alistair Popple <apopple@...dia.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Baoquan He <bhe@...hat.com> Subject: [PATCH -v3 2/3] resource: Make alloc_free_mem_region() works for iomem_resource 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. Signed-off-by: "Huang, Ying" <ying.huang@...el.com> Cc: Dan Williams <dan.j.williams@...el.com> Cc: David Hildenbrand <david@...hat.com> Cc: Davidlohr Bueso <dave@...olabs.net> Cc: Jonathan Cameron <jonathan.cameron@...wei.com> Cc: Dave Jiang <dave.jiang@...el.com> Cc: Alison Schofield <alison.schofield@...el.com> Cc: Vishal Verma <vishal.l.verma@...el.com> Cc: Ira Weiny <ira.weiny@...el.com> Cc: Alistair Popple <apopple@...dia.com> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Cc: Bjorn Helgaas <bhelgaas@...gle.com> Cc: Baoquan He <bhe@...hat.com> --- kernel/resource.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/resource.c b/kernel/resource.c index 235dc77f8add..035ef16c1a66 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1873,7 +1873,7 @@ static resource_size_t gfr_start(struct resource *base, resource_size_t size, 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, -- 2.39.2
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