add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/um/kernel/trap.c
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@@ -1,6 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2000 - 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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@@ -10,7 +10,6 @@
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 #include <linux/uaccess.h>
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 #include <linux/sched/debug.h>
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 #include <asm/current.h>
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-#include <asm/pgtable.h>
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 #include <asm/tlbflush.h>
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 #include <arch.h>
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 #include <as-layout.h>
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@@ -19,7 +18,7 @@
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 #include <skas.h>
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 /*
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- * Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by
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+ * Note this is constrained to return 0, -EFAULT, -EACCES, -ENOMEM by
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  * segv().
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  */
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 int handle_page_fault(unsigned long address, unsigned long ip,
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@@ -27,12 +26,10 @@
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 {
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 	struct mm_struct *mm = current->mm;
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 	struct vm_area_struct *vma;
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-	pgd_t *pgd;
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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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 	int err = -EFAULT;
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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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 	*code_out = SEGV_MAPERR;
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@@ -46,7 +43,7 @@
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 	if (is_user)
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 		flags |= FAULT_FLAG_USER;
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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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 	vma = find_vma(mm, address);
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 	if (!vma)
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 		goto out;
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@@ -74,7 +71,7 @@
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 	do {
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 		vm_fault_t fault;
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-		fault = handle_mm_fault(vma, address, flags);
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+		fault = handle_mm_fault(vma, address, flags, NULL);
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 		if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
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 			goto out_nosemaphore;
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@@ -91,21 +88,14 @@
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 			BUG();
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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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-			else
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-				current->min_flt++;
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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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 				goto retry;
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 			}
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 		}
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-		pgd = pgd_offset(mm, address);
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-		pud = pud_offset(pgd, address);
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-		pmd = pmd_offset(pud, address);
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+		pmd = pmd_off(mm, address);
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 		pte = pte_offset_kernel(pmd, address);
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 	} while (!pte_present(*pte));
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 	err = 0;
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@@ -122,7 +112,7 @@
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 #endif
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 	flush_tlb_page(vma, address);
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 out:
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 out_nosemaphore:
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 	return err;
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@@ -131,7 +121,7 @@
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 	 * We ran out of memory, call the OOM killer, and return the userspace
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 	 * (which will retry the fault, or kill us if we got oom-killed).
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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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 	if (!is_user)
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 		goto out_nosemaphore;
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 	pagefault_out_of_memory();
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@@ -163,13 +153,12 @@
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 static void bad_segv(struct faultinfo fi, unsigned long ip)
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 {
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 	current->thread.arch.faultinfo = fi;
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-	force_sig_fault(SIGSEGV, SEGV_ACCERR, (void __user *) FAULT_ADDRESS(fi),
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-			current);
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+	force_sig_fault(SIGSEGV, SEGV_ACCERR, (void __user *) FAULT_ADDRESS(fi));
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 }
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 void fatal_sigsegv(void)
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 {
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-	force_sigsegv(SIGSEGV, current);
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+	force_sigsegv(SIGSEGV);
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 	do_signal(&current->thread.regs);
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 	/*
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 	 * This is to tell gcc that we're not returning - do_signal
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@@ -268,13 +257,11 @@
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 	if (err == -EACCES) {
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 		current->thread.arch.faultinfo = fi;
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-		force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address,
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-				current);
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+		force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
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 	} else {
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 		BUG_ON(err != -EFAULT);
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 		current->thread.arch.faultinfo = fi;
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-		force_sig_fault(SIGSEGV, si_code, (void __user *) address,
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-				current);
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+		force_sig_fault(SIGSEGV, si_code, (void __user *) address);
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 	}
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 out:
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@@ -304,12 +291,11 @@
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 	if ((err == 0) && (siginfo_layout(sig, code) == SIL_FAULT)) {
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 		struct faultinfo *fi = UPT_FAULTINFO(regs);
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 		current->thread.arch.faultinfo = *fi;
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-		force_sig_fault(sig, code, (void __user *)FAULT_ADDRESS(*fi),
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-				current);
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+		force_sig_fault(sig, code, (void __user *)FAULT_ADDRESS(*fi));
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 	} else {
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 		printk(KERN_ERR "Attempted to relay unknown signal %d (si_code = %d) with errno %d\n",
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 		       sig, code, err);
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-		force_sig(sig, current);
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+		force_sig(sig);
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 	}
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 }
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