powerpc/64s/hash: Fix 512T hint detection to use >= 128T

Currently userspace is able to request mmap() search between 128T-512T by specifying a hint address that is greater than 128T. But that means a hint of 128T exactly will return an address below 128T, which is confusing and wrong. So fix the logic to check the hint is greater than *or equal* to 128T. Fixes: f4ea6dc ("powerpc/mm: Enable mappings above 128TB") Cc: [email protected] # v4.12+ Suggested-by: Aneesh Kumar K.V <[email protected]> Suggested-by: Nicholas Piggin <[email protected]> [mpe: Split out of Nick's bigger patch] Signed-off-by: Michael Ellerman <[email protected]>
kyagi · Nov 13, 2017 · 7ece370 · 7ece370
1 parent f23ab3e
commit 7ece370
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
@@ -419,15 +419,15 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
 	/*
 	 * Check if we need to expland slice area.
 	 */
-	if (unlikely(addr > mm->context.addr_limit &&
+	if (unlikely(addr >= mm->context.addr_limit &&
 		     mm->context.addr_limit != TASK_SIZE)) {
 		mm->context.addr_limit = TASK_SIZE;
 		on_each_cpu(slice_flush_segments, mm, 1);
 	}
 	/*
 	 * This mmap request can allocate upt to 512TB
 	 */
-	if (addr > DEFAULT_MAP_WINDOW)
+	if (addr >= DEFAULT_MAP_WINDOW)
 		high_limit = mm->context.addr_limit;
 	else
 		high_limit = DEFAULT_MAP_WINDOW;