mm: introduce arch-specific vma flag VM_ARCH_1

Combine several arch-specific vma flags into one.

before patch:

0x00000200 0x01000000 0x20000000 0x40000000
x86 VM_NOHUGEPAGE VM_HUGEPAGE - VM_PAT
powerpc - - VM_SAO -
parisc VM_GROWSUP - - -
ia64 VM_GROWSUP - - -
nommu - VM_MAPPED_COPY - -
others - - - -

after patch:

0x00000200 0x01000000 0x20000000 0x40000000
x86 - VM_PAT VM_HUGEPAGE VM_NOHUGEPAGE
powerpc - VM_SAO - -
parisc - VM_GROWSUP - -
ia64 - VM_GROWSUP - -
nommu - VM_MAPPED_COPY - -
others - VM_ARCH_1 - -

And voila! One completely free bit.

Signed-off-by: Konstantin Khlebnikov <[e-mail]>
Cc: Alexander Viro <[e-mail]>
Cc: Carsten Otte <[e-mail]>
Cc: Chris Metcalf <[e-mail]>
Cc: Cyrill Gorcunov <[e-mail]>
Cc: Eric Paris <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Hugh Dickins <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Morris <[e-mail]>
Cc: Jason Baron <[e-mail]>
Cc: Kentaro Takeda <[e-mail]>
Cc: Matt Helsley <[e-mail]>
Cc: Nick Piggin <[e-mail]>
Cc: Oleg Nesterov <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Robert Richter <[e-mail]>
Cc: Suresh Siddha <[e-mail]>
Cc: Tetsuo Handa <[e-mail]>
Cc: Venkatesh Pallipadi <[e-mail]>
Acked-by: Linus Torvalds <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/mm.h

···
 /*
  * vm_flags in vm_area_struct, see mm_types.h.
  */
+#define VM_NONE		0x00000000
+
 #define VM_READ		0x00000001	/* currently active flags */
 #define VM_WRITE	0x00000002
 #define VM_EXEC		0x00000004
···
 #define VM_MAYSHARE	0x00000080
 
 #define VM_GROWSDOWN	0x00000100	/* general info on the segment */
-#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
-#define VM_GROWSUP	0x00000200
-#else
-#define VM_GROWSUP	0x00000000
-#define VM_NOHUGEPAGE	0x00000200	/* MADV_NOHUGEPAGE marked this vma */
-#endif
 #define VM_PFNMAP	0x00000400	/* Page-ranges managed without "struct page", just pure PFN */
 #define VM_DENYWRITE	0x00000800	/* ETXTBSY on write attempts.. */
 
···
 #define VM_NORESERVE	0x00200000	/* should the VM suppress accounting */
 #define VM_HUGETLB	0x00400000	/* Huge TLB Page VM */
 #define VM_NONLINEAR	0x00800000	/* Is non-linear (remap_file_pages) */
-#ifndef CONFIG_TRANSPARENT_HUGEPAGE
-#define VM_MAPPED_COPY	0x01000000	/* T if mapped copy of data (nommu mmap) */
-#else
-#define VM_HUGEPAGE	0x01000000	/* MADV_HUGEPAGE marked this vma */
-#endif
+#define VM_ARCH_1	0x01000000	/* Architecture-specific flag */
 #define VM_INSERTPAGE	0x02000000	/* The vma has had "vm_insert_page()" done on it */
 #define VM_NODUMP	0x04000000	/* Do not include in the core dump */
 
 #define VM_CAN_NONLINEAR 0x08000000	/* Has ->fault & does nonlinear pages */
 #define VM_MIXEDMAP	0x10000000	/* Can contain "struct page" and pure PFN pages */
-#define VM_SAO		0x20000000	/* Strong Access Ordering (powerpc) */
-#define VM_PAT		0x40000000	/* PAT reserves whole VMA at once (x86) */
+#define VM_HUGEPAGE	0x20000000	/* MADV_HUGEPAGE marked this vma */
+#define VM_NOHUGEPAGE	0x40000000	/* MADV_NOHUGEPAGE marked this vma */
 #define VM_MERGEABLE	0x80000000	/* KSM may merge identical pages */
+
+#if defined(CONFIG_X86)
+# define VM_PAT		VM_ARCH_1	/* PAT reserves whole VMA at once (x86) */
+#elif defined(CONFIG_PPC)
+# define VM_SAO		VM_ARCH_1	/* Strong Access Ordering (powerpc) */
+#elif defined(CONFIG_PARISC)
+# define VM_GROWSUP	VM_ARCH_1
+#elif defined(CONFIG_IA64)
+# define VM_GROWSUP	VM_ARCH_1
+#elif !defined(CONFIG_MMU)
+# define VM_MAPPED_COPY	VM_ARCH_1	/* T if mapped copy of data (nommu mmap) */
+#endif
+
+#ifndef VM_GROWSUP
+# define VM_GROWSUP	VM_NONE
+#endif
 
 /* Bits set in the VMA until the stack is in its final location */
 #define VM_STACK_INCOMPLETE_SETUP	(VM_RAND_READ | VM_SEQ_READ)

mm/huge_memory.c

···
 	return ret;
 }
 
-#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP|VM_SAO| \
+#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP| \
 		   VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
 
 int hugepage_madvise(struct vm_area_struct *vma,

mm/ksm.c

···
 		if (*vm_flags & (VM_MERGEABLE | VM_SHARED  | VM_MAYSHARE   |
 				 VM_PFNMAP    | VM_IO      | VM_DONTEXPAND |
 				 VM_RESERVED  | VM_HUGETLB | VM_INSERTPAGE |
-				 VM_NONLINEAR | VM_MIXEDMAP | VM_SAO))
+				 VM_NONLINEAR | VM_MIXEDMAP))
 			return 0;		/* just ignore the advice */
+
+#ifdef VM_SAO
+		if (*vm_flags & VM_SAO)
+			return 0;
+#endif
 
 		if (!test_bit(MMF_VM_MERGEABLE, &mm->flags)) {
 			err = __ksm_enter(mm);