mm: Add more gfp flag check in prepare_before_alloc()

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

------------------------------------------

Memory allocation from buddy system will fallback to unmirrored memory if
mirrored memory is not enough and reliable memory fallback is closed.
___GFP_NOFAIL flag will be checked in prepare_before_alloc().

Fixes: 45bd608e ("mm: Introduce watermark check for memory reliable")
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

mm/page_alloc.c

@@ -4651,7 +4651,13 @@ static inline bool prepare_before_alloc(gfp_t *gfp_mask, unsigned int order)
 	if (!mem_reliable_is_enabled())
 		return true;
 
+	if (*gfp_mask & __GFP_NOFAIL)
+		return true;
+
 	if (gfp_ori & ___GFP_RELIABILITY) {
+		if (!(gfp_ori & __GFP_HIGHMEM) || !(gfp_ori & __GFP_MOVABLE))
+			return true;
+
 		if (mem_reliable_watermark_ok(1 << order)) {
 			*gfp_mask |= ___GFP_RELIABILITY;
 			return true;