mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit

Since commit 4064b98 ("mm: allow VM_FAULT_RETRY for multiple times") allowed VM_FAULT_RETRY for multiple times, the FAULT_FLAG_ALLOW_RETRY bit of fault_flag will not be changed in the page fault path, so the following check is no longer needed: flags & FAULT_FLAG_ALLOW_RETRY So just remove it. Link: https://lkml.kernel.org/r/20211110123358.36511-1-zhengqi.arch@bytedance.com Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: David Hildenbrand <david@redhat.com> Cc: Kirill Shutemov <kirill@shutemov.name> Cc: Peter Xu <peterx@redhat.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
roxell · Dec 3, 2021 · 38c6362 · 38c6362
1 parent c4ad9b8
commit 38c6362
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Showing 22 changed files with 132 additions and 168 deletions.
diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
@@ -165,17 +165,15 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
 
-			 /* No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
+		/* No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
 
-			goto retry;
-		}
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
@@ -149,8 +149,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
 	/*
 	 * Fault retry nuances, mmap_lock already relinquished by core mm
 	 */
-	if (unlikely((fault & VM_FAULT_RETRY) &&
-		     (flags & FAULT_FLAG_ALLOW_RETRY))) {
+	if (unlikely(fault & VM_FAULT_RETRY)) {
 		flags |= FAULT_FLAG_TRIED;
 		goto retry;
 	}

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
@@ -312,7 +312,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 		return 0;
 	}
 
-	if (!(fault & VM_FAULT_ERROR) && flags & FAULT_FLAG_ALLOW_RETRY) {
+	if (!(fault & VM_FAULT_ERROR)) {
 		if (fault & VM_FAULT_RETRY) {
 			flags |= FAULT_FLAG_TRIED;
 			goto retry;

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
@@ -606,10 +606,8 @@ static int __kprobes do_page_fault(unsigned long far, unsigned int esr,
 	}
 
 	if (fault & VM_FAULT_RETRY) {
-		if (mm_flags & FAULT_FLAG_ALLOW_RETRY) {
-			mm_flags |= FAULT_FLAG_TRIED;
-			goto retry;
-		}
+		mm_flags |= FAULT_FLAG_TRIED;
+		goto retry;
 	}
 	mmap_read_unlock(mm);
 

diff --git a/arch/hexagon/mm/vm_fault.c b/arch/hexagon/mm/vm_fault.c
@@ -98,11 +98,9 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
 
 	/* The most common case -- we are done. */
 	if (likely(!(fault & VM_FAULT_ERROR))) {
-		if (flags & FAULT_FLAG_ALLOW_RETRY) {
-			if (fault & VM_FAULT_RETRY) {
-				flags |= FAULT_FLAG_TRIED;
-				goto retry;
-			}
+		if (fault & VM_FAULT_RETRY) {
+			flags |= FAULT_FLAG_TRIED;
+			goto retry;
 		}
 
 		mmap_read_unlock(mm);

diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
@@ -156,17 +156,15 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
 
-			 /* No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
+		/* No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
 
-			goto retry;
-		}
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
@@ -153,18 +153,16 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
-
-			/*
-			 * No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
-
-			goto retry;
-		}
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
+
+		/*
+		 * No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
+
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
@@ -232,18 +232,16 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
-
-			/*
-			 * No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
-
-			goto retry;
-		}
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
+
+		/*
+		 * No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
+
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
@@ -171,18 +171,17 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
 			goto do_sigbus;
 		BUG();
 	}
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
 
-			/*
-			 * No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
 
-			goto retry;
-		}
+		/*
+		 * No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
+
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c
@@ -230,16 +230,14 @@ void do_page_fault(unsigned long entry, unsigned long addr,
 			goto bad_area;
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
-
-			/* No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
-			goto retry;
-		}
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
+
+		/* No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/nios2/mm/fault.c b/arch/nios2/mm/fault.c
@@ -149,18 +149,16 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long cause,
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
 
-			/*
-			 * No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
+		/*
+		 * No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
 
-			goto retry;
-		}
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
@@ -177,18 +177,16 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		/*RGD modeled on Cris */
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
+	/*RGD modeled on Cris */
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
 
-			 /* No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
+		/* No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
 
-			goto retry;
-		}
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
@@ -324,16 +324,14 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
 			goto bad_area;
 		BUG();
 	}
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			/*
-			 * No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
-			flags |= FAULT_FLAG_TRIED;
-			goto retry;
-		}
+	if (fault & VM_FAULT_RETRY) {
+		/*
+		 * No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
+		flags |= FAULT_FLAG_TRIED;
+		goto retry;
 	}
 	mmap_read_unlock(mm);
 	return;

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
@@ -516,10 +516,8 @@ static int ___do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * case.
 	 */
 	if (unlikely(fault & VM_FAULT_RETRY)) {
-		if (flags & FAULT_FLAG_ALLOW_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
-			goto retry;
-		}
+		flags |= FAULT_FLAG_TRIED;
+		goto retry;
 	}
 
 	mmap_read_unlock(current->mm);

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
@@ -330,7 +330,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
 	if (fault_signal_pending(fault, regs))
 		return;
 
-	if (unlikely((fault & VM_FAULT_RETRY) && (flags & FAULT_FLAG_ALLOW_RETRY))) {
+	if (unlikely(fault & VM_FAULT_RETRY)) {
 		flags |= FAULT_FLAG_TRIED;
 
 		/*

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
@@ -452,21 +452,19 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access)
 	if (unlikely(fault & VM_FAULT_ERROR))
 		goto out_up;
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			if (IS_ENABLED(CONFIG_PGSTE) && gmap &&
-			    (flags & FAULT_FLAG_RETRY_NOWAIT)) {
-				/* FAULT_FLAG_RETRY_NOWAIT has been set,
-				 * mmap_lock has not been released */
-				current->thread.gmap_pfault = 1;
-				fault = VM_FAULT_PFAULT;
-				goto out_up;
-			}
-			flags &= ~FAULT_FLAG_RETRY_NOWAIT;
-			flags |= FAULT_FLAG_TRIED;
-			mmap_read_lock(mm);
-			goto retry;
+	if (fault & VM_FAULT_RETRY) {
+		if (IS_ENABLED(CONFIG_PGSTE) && gmap &&
+			(flags & FAULT_FLAG_RETRY_NOWAIT)) {
+			/* FAULT_FLAG_RETRY_NOWAIT has been set,
+			 * mmap_lock has not been released */
+			current->thread.gmap_pfault = 1;
+			fault = VM_FAULT_PFAULT;
+			goto out_up;
 		}
+		flags &= ~FAULT_FLAG_RETRY_NOWAIT;
+		flags |= FAULT_FLAG_TRIED;
+		mmap_read_lock(mm);
+		goto retry;
 	}
 	if (IS_ENABLED(CONFIG_PGSTE) && gmap) {
 		address =  __gmap_link(gmap, current->thread.gmap_addr,

diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
@@ -485,17 +485,15 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 		if (mm_fault_error(regs, error_code, address, fault))
 			return;
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
-
-			/*
-			 * No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
-			goto retry;
-		}
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
+
+		/*
+		 * No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);

diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c
@@ -200,17 +200,15 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 		BUG();
 	}
 
-	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_RETRY) {
-			flags |= FAULT_FLAG_TRIED;
+	if (fault & VM_FAULT_RETRY) {
+		flags |= FAULT_FLAG_TRIED;
 
-			/* No need to mmap_read_unlock(mm) as we would
-			 * have already released it in __lock_page_or_retry
-			 * in mm/filemap.c.
-			 */
+		/* No need to mmap_read_unlock(mm) as we would
+		 * have already released it in __lock_page_or_retry
+		 * in mm/filemap.c.
+		 */
 
-			goto retry;
-		}
+		goto retry;
 	}
 
 	mmap_read_unlock(mm);