From 7bdb468c2c99dd780c9a5321f93c79cbfdce2527 Mon Sep 17 00:00:00 2001

From: Kazuhito Hagio <k-hagio@ab.jp.nec.com>

Date: Tue, 23 Jul 2019 12:24:47 -0400

Subject: [PATCH] [PATCH] Increase SECTION_MAP_LAST_BIT to 4

kernel commit 326e1b8f83a4 ("mm/sparsemem: introduce a SECTION_IS_EARLY

flag") added the flag to mem_section->section_mem_map value, and it caused

makedumpfile an error like the following:

  readmem: Can't convert a virtual address(fffffc97d1000000) to physical address.

  readmem: type_addr: 0, addr:fffffc97d1000000, size:32768

  __exclude_unnecessary_pages: Can't read the buffer of struct page.

  create_2nd_bitmap: Can't exclude unnecessary pages.

To fix this, SECTION_MAP_LAST_BIT needs to be updated. The bit has not

been used until the addition, so we can just increase the value.

Signed-off-by: Kazuhito Hagio <k-hagio@ab.jp.nec.com>

---

 makedumpfile.h | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/makedumpfile-1.6.6/makedumpfile.h b/makedumpfile-1.6.6/makedumpfile.h

index 24b2f69f400c..df745b9f53e5 100644

--- a/makedumpfile-1.6.6/makedumpfile.h

+++ b/makedumpfile-1.6.6/makedumpfile.h

@@ -195,7 +195,7 @@ isAnon(unsigned long mapping)

  *  2. it has been verified that (1UL<<2) was never set, so it is

  *     safe to mask that bit off even in old kernels.

  */

-#define SECTION_MAP_LAST_BIT	(1UL<<3)

+#define SECTION_MAP_LAST_BIT	(1UL<<4)

 #define SECTION_MAP_MASK	(~(SECTION_MAP_LAST_BIT-1))

 #define NR_SECTION_ROOTS()	divideup(num_section, SECTIONS_PER_ROOT())

 #define SECTION_NR_TO_PFN(sec)	((sec) << PFN_SECTION_SHIFT())

-- 

2.17.2