The patch titled
Subject: kexec: clear crashk_res if all its memory has been released
has been added to the -mm mm-nonmm-unstable branch. Its filename is
kexec-clear-crashk_res-if-all-its-memory-has-been-released.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kexec-clear-crashk_res-if-all-its-memory-has-been-released.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Subject: kexec: clear crashk_res if all its memory has been released
Date: Sat, 27 May 2023 20:34:36 +0800
If the resource of crashk_res has been released, it is better to clear
crashk_res.start and crashk_res.end. Because 'end = start - 1' is not
reasonable, and in some places the test is based on crashk_res.end, not
resource_size(&crashk_res).
Link: https://lkml.kernel.org/r/20230527123439.772-4-thunder.leizhen@xxxxxxxxxx
Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Cong Wang <amwang@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kexec_core.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/kernel/kexec_core.c~kexec-clear-crashk_res-if-all-its-memory-has-been-released
+++ a/kernel/kexec_core.c
@@ -1137,15 +1137,18 @@ int crash_shrink_memory(unsigned long ne
end = start + new_size;
crash_free_reserved_phys_range(end, crashk_res.end);
- if (start == end)
- release_resource(&crashk_res);
-
ram_res->start = end;
ram_res->end = crashk_res.end;
ram_res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
ram_res->name = "System RAM";
- crashk_res.end = end - 1;
+ if (start == end) {
+ release_resource(&crashk_res);
+ crashk_res.start = 0;
+ crashk_res.end = 0;
+ } else {
+ crashk_res.end = end - 1;
+ }
insert_resource(&iomem_resource, ram_res);
_
Patches currently in -mm which might be from thunder.leizhen@xxxxxxxxxx are
kexec-fix-a-memory-leak-in-crash_shrink_memory.patch
kexec-delete-a-useless-check-in-crash_shrink_memory.patch
kexec-clear-crashk_res-if-all-its-memory-has-been-released.patch
kexec-improve-the-readability-of-crash_shrink_memory.patch
kexec-add-helper-__crash_shrink_memory.patch
kexec-enable-kexec_crash_size-to-support-two-crash-kernel-regions.patch
