debug lk

hc

2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077

 kernel/arch/sparc/mm/fault_32.c
..
..
@@ -25,7 +25,6 @@
25
25
 #include <linux/uaccess.h>
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26
 
27
27
 #include <asm/page.h>
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-#include <asm/pgtable.h>
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28
 #include <asm/openprom.h>
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29
 #include <asm/oplib.h>
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30
 #include <asm/setup.h>
..
..
@@ -131,7 +130,7 @@
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130
 		show_signal_msg(regs, sig, code,
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131
 				addr, current);
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132
 
134
-	force_sig_fault(sig, code, (void __user *) addr, 0, current);
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+	force_sig_fault(sig, code, (void __user *) addr, 0);
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 }
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135
 
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136
 static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
..
..
@@ -168,7 +167,7 @@
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 	int from_user = !(regs->psr & PSR_PS);
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168
 	int code;
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169
 	vm_fault_t fault;
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-	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
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+	unsigned int flags = FAULT_FLAG_DEFAULT;
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171
 
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 	if (text_fault)
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 		address = regs->pc;
..
..
@@ -196,7 +195,7 @@
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 	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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196
 
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 retry:
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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199
 
201
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 	if (!from_user && address >= PAGE_OFFSET)
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201
 		goto bad_area;
..
..
@@ -235,9 +234,9 @@
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 	 * make sure we exit gracefully rather than endlessly redo
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235
 	 * the fault.
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236
 	 */
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-	fault = handle_mm_fault(vma, address, flags);
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+	fault = handle_mm_fault(vma, address, flags, regs);
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238
 
240
-	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
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+	if (fault_signal_pending(fault, regs))
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240
 		return;
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241
 
243
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 	if (unlikely(fault & VM_FAULT_ERROR)) {
..
..
@@ -251,20 +250,10 @@
251
250
 	}
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251
 
253
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 	if (flags & FAULT_FLAG_ALLOW_RETRY) {
254
-		if (fault & VM_FAULT_MAJOR) {
255
-			current->maj_flt++;
256
-			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
257
-				      1, regs, address);
258
-		} else {
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-			current->min_flt++;
260
-			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
261
-				      1, regs, address);
262
-		}
263
253
 		if (fault & VM_FAULT_RETRY) {
264
-			flags &= ~FAULT_FLAG_ALLOW_RETRY;
265
254
 			flags |= FAULT_FLAG_TRIED;
266
255
 
267
-			/* No need to up_read(&mm->mmap_sem) as we would
256
+			/* No need to mmap_read_unlock(mm) as we would
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257
 			 * have already released it in __lock_page_or_retry
269
258
 			 * in mm/filemap.c.
270
259
 			 */
..
..
@@ -273,7 +262,7 @@
273
262
 		}
274
263
 	}
275
264
 
276
-	up_read(&mm->mmap_sem);
265
+	mmap_read_unlock(mm);
277
266
 	return;
278
267
 
279
268
 	/*
..
..
@@ -281,7 +270,7 @@
281
270
 	 * Fix it, but check if it's kernel or user first..
282
271
 	 */
283
272
 bad_area:
284
-	up_read(&mm->mmap_sem);
273
+	mmap_read_unlock(mm);
285
274
 
286
275
 bad_area_nosemaphore:
287
276
 	/* User mode accesses just cause a SIGSEGV */
..
..
@@ -299,8 +288,6 @@
299
288
 		if (fixup > 10) {
300
289
 			extern const unsigned int __memset_start[];
301
290
 			extern const unsigned int __memset_end[];
302
-			extern const unsigned int __csum_partial_copy_start[];
303
-			extern const unsigned int __csum_partial_copy_end[];
304
291
 
305
292
 #ifdef DEBUG_EXCEPTIONS
306
293
 			printk("Exception: PC<%08lx> faddr<%08lx>\n",
..
..
@@ -309,9 +296,7 @@
309
296
 				regs->pc, fixup, g2);
310
297
 #endif
311
298
 			if ((regs->pc >= (unsigned long)__memset_start &&
312
-			     regs->pc < (unsigned long)__memset_end) ||
313
-			    (regs->pc >= (unsigned long)__csum_partial_copy_start &&
314
-			     regs->pc < (unsigned long)__csum_partial_copy_end)) {
299
+			     regs->pc < (unsigned long)__memset_end)) {
315
300
 				regs->u_regs[UREG_I4] = address;
316
301
 				regs->u_regs[UREG_I5] = regs->pc;
317
302
 			}
..
..
@@ -330,7 +315,7 @@
330
315
  * us unable to handle the page fault gracefully.
331
316
  */
332
317
 out_of_memory:
333
-	up_read(&mm->mmap_sem);
318
+	mmap_read_unlock(mm);
334
319
 	if (from_user) {
335
320
 		pagefault_out_of_memory();
336
321
 		return;
..
..
@@ -338,7 +323,7 @@
338
323
 	goto no_context;
339
324
 
340
325
 do_sigbus:
341
-	up_read(&mm->mmap_sem);
326
+	mmap_read_unlock(mm);
342
327
 	do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, text_fault);
343
328
 	if (!from_user)
344
329
 		goto no_context;
..
..
@@ -351,6 +336,8 @@
351
336
 		 */
352
337
 		int offset = pgd_index(address);
353
338
 		pgd_t *pgd, *pgd_k;
339
+		p4d_t *p4d, *p4d_k;
340
+		pud_t *pud, *pud_k;
354
341
 		pmd_t *pmd, *pmd_k;
355
342
 
356
343
 		pgd = tsk->active_mm->pgd + offset;
..
..
@@ -363,8 +350,13 @@
363
350
 			return;
364
351
 		}
365
352
 
366
-		pmd = pmd_offset(pgd, address);
367
-		pmd_k = pmd_offset(pgd_k, address);
353
+		p4d = p4d_offset(pgd, address);
354
+		pud = pud_offset(p4d, address);
355
+		pmd = pmd_offset(pud, address);
356
+
357
+		p4d_k = p4d_offset(pgd_k, address);
358
+		pud_k = pud_offset(p4d_k, address);
359
+		pmd_k = pmd_offset(pud_k, address);
368
360
 
369
361
 		if (pmd_present(*pmd) || !pmd_present(*pmd_k))
370
362
 			goto bad_area_nosemaphore;
..
..
@@ -385,7 +377,7 @@
385
377
 
386
378
 	code = SEGV_MAPERR;
387
379
 
388
-	down_read(&mm->mmap_sem);
380
+	mmap_read_lock(mm);
389
381
 	vma = find_vma(mm, address);
390
382
 	if (!vma)
391
383
 		goto bad_area;
..
..
@@ -405,27 +397,27 @@
405
397
 		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
406
398
 			goto bad_area;
407
399
 	}
408
-	switch (handle_mm_fault(vma, address, flags)) {
400
+	switch (handle_mm_fault(vma, address, flags, NULL)) {
409
401
 	case VM_FAULT_SIGBUS:
410
402
 	case VM_FAULT_OOM:
411
403
 		goto do_sigbus;
412
404
 	}
413
-	up_read(&mm->mmap_sem);
405
+	mmap_read_unlock(mm);
414
406
 	return;
415
407
 bad_area:
416
-	up_read(&mm->mmap_sem);
408
+	mmap_read_unlock(mm);
417
409
 	__do_fault_siginfo(code, SIGSEGV, tsk->thread.kregs, address);
418
410
 	return;
419
411
 
420
412
 do_sigbus:
421
-	up_read(&mm->mmap_sem);
413
+	mmap_read_unlock(mm);
422
414
 	__do_fault_siginfo(BUS_ADRERR, SIGBUS, tsk->thread.kregs, address);
423
415
 }
424
416
 
425
417
 static void check_stack_aligned(unsigned long sp)
426
418
 {
427
419
 	if (sp & 0x7UL)
428
-		force_sig(SIGILL, current);
420
+		force_sig(SIGILL);
429
421
 }
430
422
 
431
423
 void window_overflow_fault(void)