[Crash-utility] [PATCH] Fix fill_mem_map_cache() to read page-size-or-less size correctly

[Kazuhito Hagio]

fill_mem_map_cache() intends to read page-size-or-less size if it cannot
read the whole cache size, but it seems it doesn't correctly, and shows
just zero for existing data.

  crash> kmem -p 1000
        PAGE       PHYSICAL      MAPPING       INDEX CNT FLAGS
  ffffea0000000040     1000                0        0  0 0
  crash> rd ffffea0000000040
  ffffea0000000040:  000fffff00000400                    ........

I think the size below should be cnt, and confirmed that the patch works
well with a dump by makedumpfile -e option.

Signed-off-by: Kazuhito Hagio <k-hagio at ab.jp.nec.com>
---
 memory.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/memory.c b/memory.c
index ac7e73679405..4584673ed0ae 100644
--- a/memory.c
+++ b/memory.c
@@ -6348,13 +6348,13 @@ fill_mem_map_cache(ulong pp, ulong ppend, char *page_cache)
                 if (cnt > size)
                         cnt = size;
 
-		if (!readmem(addr, KVADDR, bufptr, size,
+		if (!readmem(addr, KVADDR, bufptr, cnt,
                     "virtual page struct cache", RETURN_ON_ERROR|QUIET)) {
-			BZERO(bufptr, size);
-			if (!(vt->flags & V_MEM_MAP) && ((addr+size) < ppend)) 
+			BZERO(bufptr, cnt);
+			if (!(vt->flags & V_MEM_MAP) && ((addr+cnt) < ppend))
 				error(WARNING, 
 		                   "mem_map[] from %lx to %lx not accessible\n",
-					addr, addr+size);
+					addr, addr+cnt);
 		}
 
 		addr += cnt;
-- 
2.18.1