Please have a look at the next few lines of the patch. I have defined the functions as FOLIO_FLAG(partially_mapped, FOLIO_SECOND_PAGE). I believe thats what you are saying in your second paragraph?
I am not sure what you meant by using PG_reclaim.
I have added the next few lines of the patch below:
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index a0a29bd092f8..cecc1bad7910 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -182,6 +182,7 @@ enum pageflags {
/* At least one page in this folio has the hwpoison flag set */
PG_has_hwpoisoned = PG_active,
PG_large_rmappable = PG_workingset, /* anon or file-backed */
+ PG_partially_mapped, /* was identified to be partially mapped */
};
#define PAGEFLAGS_MASK ((1UL << NR_PAGEFLAGS) - 1)
@@ -861,8 +862,10 @@ static inline void ClearPageCompound(struct page *page)
ClearPageHead(page);
}
FOLIO_FLAG(large_rmappable, FOLIO_SECOND_PAGE)
+FOLIO_FLAG(partially_mapped, FOLIO_SECOND_PAGE)
#else
FOLIO_FLAG_FALSE(large_rmappable)
