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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/arm64/mm/ioremap.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Based on arch/arm/mm/ioremap.c
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  *
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@@ -6,28 +7,16 @@
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  * Hacked to allow all architectures to build, and various cleanups
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  * by Russell King
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  * Copyright (C) 2012 ARM Ltd.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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 #include <linux/export.h>
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 #include <linux/mm.h>
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 #include <linux/vmalloc.h>
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 #include <linux/io.h>
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+#include <linux/memblock.h>
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 #include <asm/fixmap.h>
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 #include <asm/tlbflush.h>
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-#include <asm/pgalloc.h>
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 static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
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 				      pgprot_t prot, void *caller)
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@@ -80,7 +69,7 @@
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 }
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 EXPORT_SYMBOL(__ioremap);
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-void __iounmap(volatile void __iomem *io_addr)
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+void iounmap(volatile void __iomem *io_addr)
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 {
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 	unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
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@@ -91,7 +80,7 @@
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 	if (is_vmalloc_addr((void *)addr))
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 		vunmap((void *)addr);
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 }
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-EXPORT_SYMBOL(__iounmap);
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+EXPORT_SYMBOL(iounmap);
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 void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
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 {
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@@ -111,3 +100,11 @@
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 {
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 	early_ioremap_setup();
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 }
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+
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+bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
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+				 unsigned long flags)
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+{
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+	unsigned long pfn = PHYS_PFN(offset);
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+
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+	return memblock_is_map_memory(pfn);
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+}