On 5/21/2021 3:25 PM, Axel Rasmussen wrote:
This seems reasonable to me. The particular bit used isn't so
important from my perspective. I can't think of a way this would break
backward compatibility or such. So:
Reviewed-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Thanks!
Yu-cheng
On Fri, May 21, 2021 at 3:13 PM Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx> wrote:
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@xxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
---
include/linux/mm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c274f75efcf9..923f89b9f1b5 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -373,7 +373,7 @@ 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
--
2.21.0
