kexec-tools/kexec-tools-2.0.22-makedumpfile-Increase-SECTION_MAP_LAST_BIT-to-5.patch
Tao Liu 18b9b763de Increase SECTION_MAP_LAST_BIT to 5
Backport from upstream.

commit 646456862df8926ba10dd7330abf3bf0f887e1b6
Author: Kazuhito Hagio <k-hagio-ab@nec.com>
Date:   Wed May 26 14:31:26 2021 +0900

    [PATCH] Increase SECTION_MAP_LAST_BIT to 5

    * Required for kernel 5.12

    Kernel commit 1f90a3477df3 ("mm: teach pfn_to_online_page() about
    ZONE_DEVICE section collisions") added a section flag
    (SECTION_TAINT_ZONE_DEVICE) and causes makedumpfile an error on
    some machines like this:

      __vtop4_x86_64: Can't get a valid pmd_pte.
      readmem: Can't convert a virtual address(ffffe2bdc2000000) to physical address.
      readmem: type_addr: 0, addr:ffffe2bdc2000000, size:32768
      __exclude_unnecessary_pages: Can't read the buffer of struct page.
      create_2nd_bitmap: Can't exclude unnecessary pages.

    Increase SECTION_MAP_LAST_BIT to 5 to fix this.  The bit had not
    been used until the change, so we can just increase the value.

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

Signed-off-by: Tao Liu <ltao@redhat.com>
Acked-by: Kairui Song <kasong@redhat.com>
2021-06-28 15:52:02 +08:00

43 lines
1.6 KiB
Diff

From 646456862df8926ba10dd7330abf3bf0f887e1b6 Mon Sep 17 00:00:00 2001
From: Kazuhito Hagio <k-hagio-ab@nec.com>
Date: Wed, 26 May 2021 14:31:26 +0900
Subject: [PATCH] Increase SECTION_MAP_LAST_BIT to 5
* Required for kernel 5.12
Kernel commit 1f90a3477df3 ("mm: teach pfn_to_online_page() about
ZONE_DEVICE section collisions") added a section flag
(SECTION_TAINT_ZONE_DEVICE) and causes makedumpfile an error on
some machines like this:
__vtop4_x86_64: Can't get a valid pmd_pte.
readmem: Can't convert a virtual address(ffffe2bdc2000000) to physical address.
readmem: type_addr: 0, addr:ffffe2bdc2000000, size:32768
__exclude_unnecessary_pages: Can't read the buffer of struct page.
create_2nd_bitmap: Can't exclude unnecessary pages.
Increase SECTION_MAP_LAST_BIT to 5 to fix this. The bit had not
been used until the change, so we can just increase the value.
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
---
makedumpfile.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/makedumpfile-1.6.9/makedumpfile.h b/makedumpfile-1.6.9/makedumpfile.h
index 93aa774..79046f2 100644
--- a/makedumpfile-1.6.9/makedumpfile.h
+++ b/makedumpfile-1.6.9/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<<4)
+#define SECTION_MAP_LAST_BIT (1UL<<5)
#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())
--
2.29.2