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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/sparc/mm/fault_32.c
..
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@@ -25,7 +25,6 @@
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 #include <linux/uaccess.h>
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26
 
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 #include <asm/page.h>
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-#include <asm/pgtable.h>
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 #include <asm/openprom.h>
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 #include <asm/oplib.h>
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 #include <asm/setup.h>
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@@ -131,7 +130,7 @@
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 		show_signal_msg(regs, sig, code,
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 				addr, current);
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-	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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 static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
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@@ -168,7 +167,7 @@
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 	int from_user = !(regs->psr & PSR_PS);
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 	int code;
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 	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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 	if (text_fault)
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 		address = regs->pc;
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@@ -196,7 +195,7 @@
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 	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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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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 	if (!from_user && address >= PAGE_OFFSET)
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 		goto bad_area;
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@@ -235,9 +234,9 @@
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 	 * make sure we exit gracefully rather than endlessly redo
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 	 * the fault.
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 	 */
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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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-	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
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+	if (fault_signal_pending(fault, regs))
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 		return;
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241
 
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 	if (unlikely(fault & VM_FAULT_ERROR)) {
..
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@@ -251,20 +250,10 @@
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 	}
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 	if (flags & FAULT_FLAG_ALLOW_RETRY) {
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-		if (fault & VM_FAULT_MAJOR) {
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-			current->maj_flt++;
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-			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
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-				      1, regs, address);
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-		} else {
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-			current->min_flt++;
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-			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
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-				      1, regs, address);
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-		}
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 		if (fault & VM_FAULT_RETRY) {
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-			flags &= ~FAULT_FLAG_ALLOW_RETRY;
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 			flags |= FAULT_FLAG_TRIED;
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255
 
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-			/* No need to up_read(&mm->mmap_sem) as we would
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+			/* No need to mmap_read_unlock(mm) as we would
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 			 * have already released it in __lock_page_or_retry
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 			 * in mm/filemap.c.
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 			 */
..
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@@ -273,7 +262,7 @@
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 		}
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 	}
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264
 
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	return;
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267
 
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 	/*
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@@ -281,7 +270,7 @@
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 	 * Fix it, but check if it's kernel or user first..
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 	 */
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 bad_area:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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274
 
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 bad_area_nosemaphore:
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 	/* User mode accesses just cause a SIGSEGV */
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@@ -299,8 +288,6 @@
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 		if (fixup > 10) {
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 			extern const unsigned int __memset_start[];
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 			extern const unsigned int __memset_end[];
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-			extern const unsigned int __csum_partial_copy_start[];
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-			extern const unsigned int __csum_partial_copy_end[];
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291
 
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 #ifdef DEBUG_EXCEPTIONS
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 			printk("Exception: PC<%08lx> faddr<%08lx>\n",
..
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@@ -309,9 +296,7 @@
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 				regs->pc, fixup, g2);
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 #endif
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 			if ((regs->pc >= (unsigned long)__memset_start &&
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-			     regs->pc < (unsigned long)__memset_end) ||
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-			    (regs->pc >= (unsigned long)__csum_partial_copy_start &&
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-			     regs->pc < (unsigned long)__csum_partial_copy_end)) {
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+			     regs->pc < (unsigned long)__memset_end)) {
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 				regs->u_regs[UREG_I4] = address;
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 				regs->u_regs[UREG_I5] = regs->pc;
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302
 			}
..
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@@ -330,7 +315,7 @@
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  * us unable to handle the page fault gracefully.
331
316
  */
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 out_of_memory:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	if (from_user) {
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 		pagefault_out_of_memory();
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321
 		return;
..
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@@ -338,7 +323,7 @@
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 	goto no_context;
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324
 
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 do_sigbus:
341
-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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327
 	do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, text_fault);
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328
 	if (!from_user)
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329
 		goto no_context;
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@@ -351,6 +336,8 @@
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 		 */
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 		int offset = pgd_index(address);
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 		pgd_t *pgd, *pgd_k;
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+		p4d_t *p4d, *p4d_k;
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+		pud_t *pud, *pud_k;
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341
 		pmd_t *pmd, *pmd_k;
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342
 
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 		pgd = tsk->active_mm->pgd + offset;
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@@ -363,8 +350,13 @@
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 			return;
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351
 		}
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352
 
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-		pmd = pmd_offset(pgd, address);
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-		pmd_k = pmd_offset(pgd_k, address);
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+		p4d = p4d_offset(pgd, address);
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+		pud = pud_offset(p4d, address);
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+		pmd = pmd_offset(pud, address);
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+
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+		p4d_k = p4d_offset(pgd_k, address);
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+		pud_k = pud_offset(p4d_k, address);
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+		pmd_k = pmd_offset(pud_k, address);
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360
 
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 		if (pmd_present(*pmd) || !pmd_present(*pmd_k))
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 			goto bad_area_nosemaphore;
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@@ -385,7 +377,7 @@
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377
 
386
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 	code = SEGV_MAPERR;
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379
 
388
-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	vma = find_vma(mm, address);
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 	if (!vma)
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 		goto bad_area;
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@@ -405,27 +397,27 @@
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 		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
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 			goto bad_area;
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 	}
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-	switch (handle_mm_fault(vma, address, flags)) {
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+	switch (handle_mm_fault(vma, address, flags, NULL)) {
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 	case VM_FAULT_SIGBUS:
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 	case VM_FAULT_OOM:
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 		goto do_sigbus;
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 	}
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	return;
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 bad_area:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	__do_fault_siginfo(code, SIGSEGV, tsk->thread.kregs, address);
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 	return;
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 do_sigbus:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	__do_fault_siginfo(BUS_ADRERR, SIGBUS, tsk->thread.kregs, address);
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 }
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416
 
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 static void check_stack_aligned(unsigned long sp)
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 {
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 	if (sp & 0x7UL)
428
-		force_sig(SIGILL, current);
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+		force_sig(SIGILL);
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 }
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422
 
431
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 void window_overflow_fault(void)