mm/memblock.c: fix index adjustment error in __next_mem_range_rev()

Fix region index adjustment error when parameter type_b of
__next_mem_range_rev() == NULL.

Signed-off-by: zijun_hu <[email protected]>
Cc: Alexander Kuleshov <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Tang Chen <[email protected]>
Cc: Wei Yang <[email protected]>
Cc: Tang Chen <[email protected]>
Cc: Richard Leitner <[email protected]>
Cc: David Gibson <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/memblock.c b/mm/memblock.c
index 4884a162e3ad053c6ae169313647c8818f0d0165..ff5ff3b5f1ea774403b2231aa3053865a52ee31d 100644 (file)
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1027,7 +1027,7 @@ void __init_memblock __next_mem_range_rev(u64 *idx, int nid, ulong flags,
                                *out_end = m_end;
                        if (out_nid)
                                *out_nid = m_nid;
-                       idx_a++;
+                       idx_a--;
                        *idx = (u32)idx_a | (u64)idx_b << 32;
                        return;
                }