lmb: allow for resizing lmb regions

Allow for resizing of LMB regions if the region attributes match. The
current code returns a failure status on detecting an overlapping
address. This worked up until now since the LMB calls were not
persistent and global -- the LMB memory map was specific and private
to a given caller of the LMB API's.

With the change in the LMB code to make the LMB reservations
persistent, there needs to be a check on whether the memory region can
be resized, and then do it if so. To distinguish between memory that
cannot be resized, add a new flag, LMB_NOOVERWRITE. Reserving a region
of memory with this attribute would indicate that the region cannot be
resized.

Signed-off-by: Sughosh Ganu <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/lmb.h b/include/lmb.h
index 0979dcebc00..cc2c426c13b 100644
--- a/include/lmb.h
+++ b/include/lmb.h
@@ -22,6 +22,7 @@
 enum lmb_flags {
 	LMB_NONE		= 0,
 	LMB_NOMAP		= BIT(1),
+	LMB_NOOVERWRITE		= BIT(2),
 };
 
 /**