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/um/kernel/skas/mmu.c
..
..
@@ -1,7 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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- * Licensed under the GPL
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  */
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 #include <linux/mm.h>
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..
@@ -9,7 +9,6 @@
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 #include <linux/slab.h>
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 #include <asm/pgalloc.h>
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-#include <asm/pgtable.h>
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 #include <asm/sections.h>
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 #include <as-layout.h>
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 #include <os.h>
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@@ -19,14 +18,20 @@
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 			 unsigned long kernel)
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 {
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 	pgd_t *pgd;
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+	p4d_t *p4d;
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 	pud_t *pud;
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 	pmd_t *pmd;
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 	pte_t *pte;
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 	pgd = pgd_offset(mm, proc);
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-	pud = pud_alloc(mm, pgd, proc);
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-	if (!pud)
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+
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+	p4d = p4d_alloc(mm, pgd, proc);
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+	if (!p4d)
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 		goto out;
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+
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+	pud = pud_alloc(mm, p4d, proc);
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+	if (!pud)
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+		goto out_pud;
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 	pmd = pmd_alloc(mm, pud, proc);
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 	if (!pmd)
..
..
@@ -44,6 +49,8 @@
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 	pmd_free(mm, pmd);
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  out_pmd:
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 	pud_free(mm, pud);
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+ out_pud:
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+	p4d_free(mm, p4d);
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  out:
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 	return -ENOMEM;
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 }
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@@ -63,12 +70,12 @@
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 	if (current->mm != NULL && current->mm != &init_mm)
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 		from_mm = &current->mm->context;
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-	block_signals();
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+	block_signals_trace();
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 	if (from_mm)
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 		to_mm->id.u.pid = copy_context_skas0(stack,
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 						     from_mm->id.u.pid);
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 	else to_mm->id.u.pid = start_userspace(stack);
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-	unblock_signals();
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+	unblock_signals_trace();
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 	if (to_mm->id.u.pid < 0) {
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 		ret = to_mm->id.u.pid;
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@@ -107,7 +114,7 @@
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 	mm->context.stub_pages[0] = virt_to_page(__syscall_stub_start);
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 	mm->context.stub_pages[1] = virt_to_page(mm->context.id.stack);
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-	/* dup_mmap already holds mmap_sem */
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+	/* dup_mmap already holds mmap_lock */
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 	err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,
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 				      VM_READ | VM_MAYREAD | VM_EXEC |
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 				      VM_MAYEXEC | VM_DONTCOPY | VM_PFNMAP,
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@@ -119,7 +126,7 @@
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 	return;
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 out:
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-	force_sigsegv(SIGSEGV, current);
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+	force_sigsegv(SIGSEGV);
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 }
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 void arch_exit_mmap(struct mm_struct *mm)