mm: remove VM_FAULT_MINOR

The define has a comment from Nick Piggin from 2007:

 /* For backwards compat. Remove me quickly. */

I guess 9 years should not be too hurried sense of 'quickly' even for
kernel measures.
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/arm/mm/fault.c

@@ -346,7 +346,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 	up_read(&mm->mmap_sem);
 
 	/*
-	 * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
+	 * Handle the "normal" case first - VM_FAULT_MAJOR
 	 */
 	if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
 		return 0;

arch/arm64/mm/fault.c

@@ -295,7 +295,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 	up_read(&mm->mmap_sem);
 
 	/*
-	 * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
+	 * Handle the "normal" case first - VM_FAULT_MAJOR
 	 */
 	if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP |
 			      VM_FAULT_BADACCESS))))

arch/unicore32/mm/fault.c

@@ -276,7 +276,7 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 	up_read(&mm->mmap_sem);
 
 	/*
-	 * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
+	 * Handle the "normal" case first - VM_FAULT_MAJOR
 	 */
 	if (likely(!(fault &
 	       (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))

arch/xtensa/mm/fault.c

@@ -146,7 +146,7 @@ void do_page_fault(struct pt_regs *regs)
 	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
 	if (flags & VM_FAULT_MAJOR)
 		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
-	else if (flags & VM_FAULT_MINOR)
+	else
 		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
 
 	return;

include/linux/mm.h

@@ -1052,8 +1052,6 @@ static inline void clear_page_pfmemalloc(struct page *page)
  * just gets major/minor fault counters bumped up.
  */
 
-#define VM_FAULT_MINOR	0 /* For backwards compat. Remove me quickly. */
-
 #define VM_FAULT_OOM	0x0001
 #define VM_FAULT_SIGBUS	0x0002
 #define VM_FAULT_MAJOR	0x0004