Linux defines MAP_SYNC on powerpc and powerpc64 as of commit 22fcea6f85f2 ("mm: move MAP_SYNC to asm-generic/mman-common.h"), so we can stop undefining it on those architectures.
@@ -4,7 +4,6 @@
#define MAP_NORESERVE 0x40
#undef MAP_LOCKED
#define MAP_LOCKED 0x80
-#undef MAP_SYNC
#undef MCL_CURRENT
#define MCL_CURRENT 0x2000