修改GPIO导出默认初始值

hc

2024-10-16 50a212ec906f7524620675f0c57357691c26c81f

 kernel/arch/mips/vdso/genvdso.c
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@@ -1,11 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright (C) 2015 Imagination Technologies
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  * Author: Alex Smith <alex.smith@imgtec.com>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
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  */
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 /*
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@@ -263,6 +259,18 @@
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 	fprintf(out_file, "#include <linux/linkage.h>\n");
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 	fprintf(out_file, "#include <linux/mm.h>\n");
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 	fprintf(out_file, "#include <asm/vdso.h>\n");
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+	fprintf(out_file, "static int vdso_mremap(\n");
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+	fprintf(out_file, "	const struct vm_special_mapping *sm,\n");
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+	fprintf(out_file, "	struct vm_area_struct *new_vma)\n");
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+	fprintf(out_file, "{\n");
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+	fprintf(out_file, "	unsigned long new_size =\n");
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+	fprintf(out_file, "	new_vma->vm_end - new_vma->vm_start;\n");
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+	fprintf(out_file, "	if (vdso_image.size != new_size)\n");
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+	fprintf(out_file, "		return -EINVAL;\n");
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+	fprintf(out_file, "	current->mm->context.vdso =\n");
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+	fprintf(out_file, "	(void *)(new_vma->vm_start);\n");
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+	fprintf(out_file, "	return 0;\n");
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+	fprintf(out_file, "}\n");
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 	/* Write out the stripped VDSO data. */
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 	fprintf(out_file,
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@@ -287,6 +295,7 @@
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 	fprintf(out_file, "\t.mapping = {\n");
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 	fprintf(out_file, "\t\t.name = \"[vdso]\",\n");
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 	fprintf(out_file, "\t\t.pages = vdso_pages,\n");
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+	fprintf(out_file, "\t\t.mremap = vdso_mremap,\n");
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 	fprintf(out_file, "\t},\n");
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 	/* Calculate and write symbol offsets to <output file> */