x86: add table start and end sanity checks to 32-bit init_memory_mapping()

Impact: cleanup

This patch adds a sanity check to the 32-bit version of
init_memory_mapping() to reduce the diff to the 64-bit version.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1236257708-27269-9-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 00c1d85082589cefe1adbca064b027a58fcd48fd..0a3707fb973b186becd6e58da744ecdedb7b36b7 100644 (file)
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -1060,7 +1060,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 
        __flush_tlb_all();
 
-       if (!after_bootmem)
+       if (!after_bootmem && table_end > table_start)
                reserve_early(table_start << PAGE_SHIFT,
                                 table_end << PAGE_SHIFT, "PGTABLE");