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 <zijun_hu@htc.com>
Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Wei Yang <weiyang@linux.vnet.ibm.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Richard Leitner <dev@g0hl1n.net>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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;
                }