mm/vma: use new VMA flags for sticky flags logic

Use the new vma_flags_t flags implementation to perform the logic around
sticky flags and what flags are ignored on VMA merge.

We make use of the new vma_flags_empty(), vma_flags_diff_pair(), and
vma_flags_and_mask() functionality.

Also update the VMA tests accordingly.

Link: https://lkml.kernel.org/r/369574f06360ffa44707047e3b58eb4897345fba.1774034900.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Kees Cook <kees@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Ondrej Mosnacek <omosnace@redhat.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stephen Smalley <stephen.smalley.work@gmail.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Cc: xu xin <xu.xin16@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 19 insertions, 13 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7954a7a2b811..d7e647e31742 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -540,6 +540,7 @@ enum {
 
 /* VMA basic access permission flags */
 #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC)
+#define VMA_ACCESS_FLAGS mk_vma_flags(VMA_READ_BIT, VMA_WRITE_BIT, VMA_EXEC_BIT)
 
 /*
  * Special vmas that are non-mergable, non-mlock()able.
@@ -585,27 +586,32 @@ enum {
  * possesses it but the other does not, the merged VMA should nonetheless have
  * applied to it:
  *
- *   VM_SOFTDIRTY - if a VMA is marked soft-dirty, that is has not had its
- *                  references cleared via /proc/$pid/clear_refs, any merged VMA
- *                  should be considered soft-dirty also as it operates at a VMA
- *                  granularity.
+ *   VMA_SOFTDIRTY_BIT - if a VMA is marked soft-dirty, that is has not had its
+ *                       references cleared via /proc/$pid/clear_refs, any
+ *                       merged VMA should be considered soft-dirty also as it
+ *                       operates at a VMA granularity.
  *
- * VM_MAYBE_GUARD - If a VMA may have guard regions in place it implies that
- *                  mapped page tables may contain metadata not described by the
- *                  VMA and thus any merged VMA may also contain this metadata,
- *                  and thus we must make this flag sticky.
+ * VMA_MAYBE_GUARD_BIT - If a VMA may have guard regions in place it implies
+ *                       that mapped page tables may contain metadata not
+ *                       described by the VMA and thus any merged VMA may also
+ *                       contain this metadata, and thus we must make this flag
+ *                       sticky.
  */
-#define VM_STICKY (VM_SOFTDIRTY | VM_MAYBE_GUARD)
+#ifdef CONFIG_MEM_SOFT_DIRTY
+#define VMA_STICKY_FLAGS mk_vma_flags(VMA_SOFTDIRTY_BIT, VMA_MAYBE_GUARD_BIT)
+#else
+#define VMA_STICKY_FLAGS mk_vma_flags(VMA_MAYBE_GUARD_BIT)
+#endif
 
 /*
  * VMA flags we ignore for the purposes of merge, i.e. one VMA possessing one
  * of these flags and the other not does not preclude a merge.
  *
- *    VM_STICKY - When merging VMAs, VMA flags must match, unless they are
- *                'sticky'. If any sticky flags exist in either VMA, we simply
- *                set all of them on the merged VMA.
+ *    VMA_STICKY_FLAGS - When merging VMAs, VMA flags must match, unless they
+ *                       are 'sticky'. If any sticky flags exist in either VMA,
+ *                       we simply set all of them on the merged VMA.
  */
-#define VM_IGNORE_MERGE VM_STICKY
+#define VMA_IGNORE_MERGE_FLAGS VMA_STICKY_FLAGS
 
 /*
  * Flags which should result in page tables being copied on fork. These are