powerpc/mm: Refactor the floor/ceiling check in hugetlb range freeing functions

All hugetlb range freeing functions have a verification like the following,
which only differs by the mask used, depending on the page table level.

start &= MASK;
if (start < floor)
return;
if (ceiling) {
ceiling &= MASK;
if (! ceiling)
return;
}
if (end - 1 > ceiling - 1)
return;

Refactor that into a helper function which takes the mask as
an argument, returning true when [start;end[ is not fully
contained inside [floor;ceiling[

Signed-off-by: Christophe Leroy <[e-mail]>
Reviewed-by: Aneesh Kumar K.V <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/16a571bb[e-mail]

arch/powerpc/mm/hugetlbpage.c

···
 static inline void hugepd_free(struct mmu_gather *tlb, void *hugepte) {}
 #endif
 
+/* Return true when the entry to be freed maps more than the area being freed */
+static bool range_is_outside_limits(unsigned long start, unsigned long end,
+				    unsigned long floor, unsigned long ceiling,
+				    unsigned long mask)
+{
+	if ((start & mask) < floor)
+		return true;
+	if (ceiling) {
+		ceiling &= mask;
+		if (!ceiling)
+			return true;
+	}
+	return end - 1 > ceiling - 1;
+}
+
 static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift,
 			      unsigned long start, unsigned long end,
 			      unsigned long floor, unsigned long ceiling)
···
 	if (shift > pdshift)
 		num_hugepd = 1 << (shift - pdshift);
 
-	start &= pdmask;
-	if (start < floor)
-		return;
-	if (ceiling) {
-		ceiling &= pdmask;
-		if (! ceiling)
-			return;
-	}
-	if (end - 1 > ceiling - 1)
+	if (range_is_outside_limits(start, end, floor, ceiling, pdmask))
 		return;
 
 	for (i = 0; i < num_hugepd; i++, hpdp++)
···
 				   unsigned long addr, unsigned long end,
 				   unsigned long floor, unsigned long ceiling)
 {
-	unsigned long start = addr;
 	pgtable_t token = pmd_pgtable(*pmd);
 
-	start &= PMD_MASK;
-	if (start < floor)
-		return;
-	if (ceiling) {
-		ceiling &= PMD_MASK;
-		if (!ceiling)
-			return;
-	}
-	if (end - 1 > ceiling - 1)
+	if (range_is_outside_limits(addr, end, floor, ceiling, PMD_MASK))
 		return;
 
 	pmd_clear(pmd);
···
 				  addr, next, floor, ceiling);
 	} while (addr = next, addr != end);
 
-	start &= PUD_MASK;
-	if (start < floor)
-		return;
-	if (ceiling) {
-		ceiling &= PUD_MASK;
-		if (!ceiling)
-			return;
-	}
-	if (end - 1 > ceiling - 1)
+	if (range_is_outside_limits(start, end, floor, ceiling, PUD_MASK))
 		return;
 
 	pmd = pmd_offset(pud, start);
···
 		}
 	} while (addr = next, addr != end);
 
-	start &= PGDIR_MASK;
-	if (start < floor)
-		return;
-	if (ceiling) {
-		ceiling &= PGDIR_MASK;
-		if (!ceiling)
-			return;
-	}
-	if (end - 1 > ceiling - 1)
+	if (range_is_outside_limits(start, end, floor, ceiling, PGDIR_MASK))
 		return;
 
 	pud = pud_offset(p4d, start);