修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/arch/xtensa/mm/fault.c
..
..
@@ -20,7 +20,6 @@
20
20
 #include <asm/mmu_context.h>
21
21
 #include <asm/cacheflush.h>
22
22
 #include <asm/hardirq.h>
23
-#include <asm/pgalloc.h>
24
23
 
25
24
 DEFINE_PER_CPU(unsigned long, asid_cache) = ASID_USER_FIRST;
26
25
 void bad_page_fault(struct pt_regs*, unsigned long, int);
..
..
@@ -43,7 +42,7 @@
43
42
 
44
43
 	int is_write, is_exec;
45
44
 	vm_fault_t fault;
46
-	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
45
+	unsigned int flags = FAULT_FLAG_DEFAULT;
47
46
 
48
47
 	code = SEGV_MAPERR;
49
48
 
..
..
@@ -73,8 +72,11 @@
73
72
 
74
73
 	if (user_mode(regs))
75
74
 		flags |= FAULT_FLAG_USER;
75
+
76
+	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
77
+
76
78
 retry:
77
-	down_read(&mm->mmap_sem);
79
+	mmap_read_lock(mm);
78
80
 	vma = find_vma(mm, address);
79
81
 
80
82
 	if (!vma)
..
..
@@ -108,10 +110,13 @@
108
110
 	 * make sure we exit gracefully rather than endlessly redo
109
111
 	 * the fault.
110
112
 	 */
111
-	fault = handle_mm_fault(vma, address, flags);
113
+	fault = handle_mm_fault(vma, address, flags, regs);
112
114
 
113
-	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
115
+	if (fault_signal_pending(fault, regs)) {
116
+		if (!user_mode(regs))
117
+			goto bad_page_fault;
114
118
 		return;
119
+	}
115
120
 
116
121
 	if (unlikely(fault & VM_FAULT_ERROR)) {
117
122
 		if (fault & VM_FAULT_OOM)
..
..
@@ -123,15 +128,10 @@
123
128
 		BUG();
124
129
 	}
125
130
 	if (flags & FAULT_FLAG_ALLOW_RETRY) {
126
-		if (fault & VM_FAULT_MAJOR)
127
-			current->maj_flt++;
128
-		else
129
-			current->min_flt++;
130
131
 		if (fault & VM_FAULT_RETRY) {
131
-			flags &= ~FAULT_FLAG_ALLOW_RETRY;
132
132
 			flags |= FAULT_FLAG_TRIED;
133
133
 
134
-			 /* No need to up_read(&mm->mmap_sem) as we would
134
+			 /* No need to mmap_read_unlock(mm) as we would
135
135
 			 * have already released it in __lock_page_or_retry
136
136
 			 * in mm/filemap.c.
137
137
 			 */
..
..
@@ -140,24 +140,18 @@
140
140
 		}
141
141
 	}
142
142
 
143
-	up_read(&mm->mmap_sem);
144
-	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
145
-	if (flags & VM_FAULT_MAJOR)
146
-		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
147
-	else
148
-		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
149
-
143
+	mmap_read_unlock(mm);
150
144
 	return;
151
145
 
152
146
 	/* Something tried to access memory that isn't in our memory map..
153
147
 	 * Fix it, but check if it's kernel or user first..
154
148
 	 */
155
149
 bad_area:
156
-	up_read(&mm->mmap_sem);
150
+	mmap_read_unlock(mm);
157
151
 	if (user_mode(regs)) {
158
152
 		current->thread.bad_vaddr = address;
159
153
 		current->thread.error_code = is_write;
160
-		force_sig_fault(SIGSEGV, code, (void *) address, current);
154
+		force_sig_fault(SIGSEGV, code, (void *) address);
161
155
 		return;
162
156
 	}
163
157
 	bad_page_fault(regs, address, SIGSEGV);
..
..
@@ -168,7 +162,7 @@
168
162
 	 * us unable to handle the page fault gracefully.
169
163
 	 */
170
164
 out_of_memory:
171
-	up_read(&mm->mmap_sem);
165
+	mmap_read_unlock(mm);
172
166
 	if (!user_mode(regs))
173
167
 		bad_page_fault(regs, address, SIGKILL);
174
168
 	else
..
..
@@ -176,13 +170,13 @@
176
170
 	return;
177
171
 
178
172
 do_sigbus:
179
-	up_read(&mm->mmap_sem);
173
+	mmap_read_unlock(mm);
180
174
 
181
175
 	/* Send a sigbus, regardless of whether we were in kernel
182
176
 	 * or user mode.
183
177
 	 */
184
178
 	current->thread.bad_vaddr = address;
185
-	force_sig_fault(SIGBUS, BUS_ADRERR, (void *) address, current);
179
+	force_sig_fault(SIGBUS, BUS_ADRERR, (void *) address);
186
180
 
187
181
 	/* Kernel mode? Handle exceptions or die */
188
182
 	if (!user_mode(regs))
..
..
@@ -197,6 +191,8 @@
197
191
 		struct mm_struct *act_mm = current->active_mm;
198
192
 		int index = pgd_index(address);
199
193
 		pgd_t *pgd, *pgd_k;
194
+		p4d_t *p4d, *p4d_k;
195
+		pud_t *pud, *pud_k;
200
196
 		pmd_t *pmd, *pmd_k;
201
197
 		pte_t *pte_k;
202
198
 
..
..
@@ -211,8 +207,18 @@
211
207
 
212
208
 		pgd_val(*pgd) = pgd_val(*pgd_k);
213
209
 
214
-		pmd = pmd_offset(pgd, address);
215
-		pmd_k = pmd_offset(pgd_k, address);
210
+		p4d = p4d_offset(pgd, address);
211
+		p4d_k = p4d_offset(pgd_k, address);
212
+		if (!p4d_present(*p4d) || !p4d_present(*p4d_k))
213
+			goto bad_page_fault;
214
+
215
+		pud = pud_offset(p4d, address);
216
+		pud_k = pud_offset(p4d_k, address);
217
+		if (!pud_present(*pud) || !pud_present(*pud_k))
218
+			goto bad_page_fault;
219
+
220
+		pmd = pmd_offset(pud, address);
221
+		pmd_k = pmd_offset(pud_k, address);
216
222
 		if (!pmd_present(*pmd) || !pmd_present(*pmd_k))
217
223
 			goto bad_page_fault;
218
224