diff mbox series

[v2,13/39] mm: Move VM_UFFD_MINOR_BIT from 37 to 38

Message ID 20220929222936.14584-14-rick.p.edgecombe@intel.com (mailing list archive)
State New
Headers show
Series Shadowstacks for userspace | expand

Commit Message

Edgecombe, Rick P Sept. 29, 2022, 10:29 p.m. UTC 
From: Yu-cheng Yu <yu-cheng.yu@intel.com>

To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all
VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Kees Cook Oct. 3, 2022, 6:11 p.m. UTC | #1 
On Thu, Sep 29, 2022 at 03:29:10PM -0700, Rick Edgecombe wrote:
> From: Yu-cheng Yu <yu-cheng.yu@intel.com>
> 
> To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all
> VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>

Reviewed-by: Kees Cook <keescook@chromium.org>
Peter Xu Oct. 3, 2022, 6:24 p.m. UTC | #2 
On Thu, Sep 29, 2022 at 03:29:10PM -0700, Rick Edgecombe wrote:
> From: Yu-cheng Yu <yu-cheng.yu@intel.com>
> 
> To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all
> VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
> Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Mike Kravetz <mike.kravetz@oracle.com>

Acked-by: Peter Xu <peterx@redhat.com>
diff mbox series

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 21f8b27bd9fd..be80fc827212 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -365,7 +365,7 @@  extern unsigned int kobjsize(const void *objp);
 #endif
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
-# define VM_UFFD_MINOR_BIT	37
+# define VM_UFFD_MINOR_BIT	38
 # define VM_UFFD_MINOR		BIT(VM_UFFD_MINOR_BIT)	/* UFFD minor faults */
 #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
 # define VM_UFFD_MINOR		VM_NONE