修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/arch/arm/lib/uaccess_with_memcpy.c
..
..
@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  linux/arch/arm/lib/uaccess_with_memcpy.c
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  *
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  *  Written by: Lennert Buytenhek and Nicolas Pitre
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  *  Copyright (C) 2009 Marvell Semiconductor
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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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8
 
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 #include <linux/kernel.h>
..
..
@@ -27,6 +24,7 @@
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 {
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 	unsigned long addr = (unsigned long)_addr;
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 	pgd_t *pgd;
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+	p4d_t *p4d;
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 	pmd_t *pmd;
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 	pte_t *pte;
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 	pud_t *pud;
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@@ -36,7 +34,11 @@
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 	if (unlikely(pgd_none(*pgd) || pgd_bad(*pgd)))
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 		return 0;
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-	pud = pud_offset(pgd, addr);
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+	p4d = p4d_offset(pgd, addr);
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+	if (unlikely(p4d_none(*p4d) || p4d_bad(*p4d)))
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+		return 0;
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+
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+	pud = pud_offset(p4d, addr);
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 	if (unlikely(pud_none(*pud) || pud_bad(*pud)))
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 		return 0;
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..
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@@ -99,7 +101,7 @@
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 	atomic = faulthandler_disabled();
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 	if (!atomic)
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-		down_read(&current->mm->mmap_sem);
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+		mmap_read_lock(current->mm);
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 	while (n) {
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 		pte_t *pte;
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 		spinlock_t *ptl;
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@@ -107,11 +109,11 @@
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 		while (!pin_page_for_write(to, &pte, &ptl)) {
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 			if (!atomic)
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-				up_read(&current->mm->mmap_sem);
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+				mmap_read_unlock(current->mm);
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 			if (__put_user(0, (char __user *)to))
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 				goto out;
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 			if (!atomic)
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-				down_read(&current->mm->mmap_sem);
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+				mmap_read_lock(current->mm);
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 		}
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 		tocopy = (~(unsigned long)to & ~PAGE_MASK) + 1;
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@@ -131,7 +133,7 @@
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 			spin_unlock(ptl);
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 	}
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 	if (!atomic)
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-		up_read(&current->mm->mmap_sem);
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+		mmap_read_unlock(current->mm);
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 out:
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 	return n;
..
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@@ -168,17 +170,17 @@
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 		return 0;
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 	}
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-	down_read(&current->mm->mmap_sem);
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+	mmap_read_lock(current->mm);
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 	while (n) {
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 		pte_t *pte;
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 		spinlock_t *ptl;
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 		int tocopy;
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 		while (!pin_page_for_write(addr, &pte, &ptl)) {
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-			up_read(&current->mm->mmap_sem);
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+			mmap_read_unlock(current->mm);
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 			if (__put_user(0, (char __user *)addr))
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 				goto out;
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-			down_read(&current->mm->mmap_sem);
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+			mmap_read_lock(current->mm);
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 		}
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 		tocopy = (~(unsigned long)addr & ~PAGE_MASK) + 1;
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@@ -196,7 +198,7 @@
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 		else
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 			spin_unlock(ptl);
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 	}
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-	up_read(&current->mm->mmap_sem);
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+	mmap_read_unlock(current->mm);
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 out:
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 	return n;