code-patching.c (1136fa0c07de570dc17858745af8be169d1440ba) code-patching.c (591b4b268435f00d2f0b81f786c2c7bd5ef66416)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2008 Michael Ellerman, IBM Corporation.
4 */
5
6#include <linux/kprobes.h>
7#include <linux/vmalloc.h>
8#include <linux/init.h>

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38int raw_patch_instruction(u32 *addr, ppc_inst_t instr)
39{
40 return __patch_instruction(addr, instr, addr);
41}
42
43#ifdef CONFIG_STRICT_KERNEL_RWX
44static DEFINE_PER_CPU(struct vm_struct *, text_poke_area);
45
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2008 Michael Ellerman, IBM Corporation.
4 */
5
6#include <linux/kprobes.h>
7#include <linux/vmalloc.h>
8#include <linux/init.h>

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38int raw_patch_instruction(u32 *addr, ppc_inst_t instr)
39{
40 return __patch_instruction(addr, instr, addr);
41}
42
43#ifdef CONFIG_STRICT_KERNEL_RWX
44static DEFINE_PER_CPU(struct vm_struct *, text_poke_area);
45
46static int map_patch_area(void *addr, unsigned long text_poke_addr);
47static void unmap_patch_area(unsigned long addr);
48
46static int text_area_cpu_up(unsigned int cpu)
47{
48 struct vm_struct *area;
49static int text_area_cpu_up(unsigned int cpu)
50{
51 struct vm_struct *area;
52 unsigned long addr;
53 int err;
49
50 area = get_vm_area(PAGE_SIZE, VM_ALLOC);
51 if (!area) {
52 WARN_ONCE(1, "Failed to create text area for cpu %d\n",
53 cpu);
54 return -1;
55 }
54
55 area = get_vm_area(PAGE_SIZE, VM_ALLOC);
56 if (!area) {
57 WARN_ONCE(1, "Failed to create text area for cpu %d\n",
58 cpu);
59 return -1;
60 }
61
62 // Map/unmap the area to ensure all page tables are pre-allocated
63 addr = (unsigned long)area->addr;
64 err = map_patch_area(empty_zero_page, addr);
65 if (err)
66 return err;
67
68 unmap_patch_area(addr);
69
56 this_cpu_write(text_poke_area, area);
57
58 return 0;
59}
60
61static int text_area_cpu_down(unsigned int cpu)
62{
63 free_vm_area(this_cpu_read(text_poke_area));

--- 290 unchanged lines hidden --- 		70 this_cpu_write(text_poke_area, area);
71
72 return 0;
73}
74
75static int text_area_cpu_down(unsigned int cpu)
76{
77 free_vm_area(this_cpu_read(text_poke_area));

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