mm/vma: introduce vma_clear_flags[_mask]()

Introduce a helper function and helper macro to easily clear a VMA's flags
using the new vma_flags_t vma->flags field:

* vma_clear_flags_mask() - Clears all of the flags in a specified mask in
			   the VMA's flags field.
* vma_clear_flags() - Clears all of the specified individual VMA flag bits
		      in a VMA's flags field.

Also update the VMA tests to reflect the change.

Link: https://lkml.kernel.org/r/9bd15da35c2c90e7441265adf01b5c2d3b5c6d41.1774034900.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>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4042a584671ecda44ac7323d7ea227e4fd4e9688..6b614f8af0457544ea365a06a41bca87ae024801 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1363,6 +1363,22 @@ static __always_inline void vma_set_flags_mask(struct vm_area_struct *vma,
 #define vma_set_flags(vma, ...) \
        vma_set_flags_mask(vma, mk_vma_flags(__VA_ARGS__))
 
+/* Helper to clear all VMA flags in a VMA. */
+static __always_inline void vma_clear_flags_mask(struct vm_area_struct *vma,
+               vma_flags_t flags)
+{
+       vma_flags_clear_mask(&vma->flags, flags);
+}
+
+/*
+ * Helper macro for clearing VMA flags, e.g.:
+ *
+ * vma_clear_flags(vma, VMA_IO_BIT, VMA_PFNMAP_BIT, VMA_DONTEXPAND_BIT,
+ *             VMA_DONTDUMP_BIT);
+ */
+#define vma_clear_flags(vma, ...) \
+       vma_clear_flags_mask(vma, mk_vma_flags(__VA_ARGS__))
+
 /*
  * Test whether a specific VMA flag is set in a VMA descriptor, e.g.:
  *

diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 36373b81ad24d94976fe045907d960df76814a33..93ea600d0895b2d9446ee0b2d0c000d240f3e0cd 100644 (file)
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -1065,6 +1065,15 @@ static __always_inline void vma_set_flags_mask(struct vm_area_struct *vma,
 #define vma_set_flags(vma, ...) \
        vma_set_flags_mask(vma, mk_vma_flags(__VA_ARGS__))
 
+static __always_inline void vma_clear_flags_mask(struct vm_area_struct *vma,
+               vma_flags_t flags)
+{
+       vma_flags_clear_mask(&vma->flags, flags);
+}
+
+#define vma_clear_flags(vma, ...) \
+       vma_clear_flags_mask(vma, mk_vma_flags(__VA_ARGS__))
+
 static __always_inline bool vma_desc_test(const struct vm_area_desc *desc,
                vma_flag_t bit)
 {