The patch titled
Subject: kdump: defer the insertion of crashkernel resources
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
kdump-defer-the-insertion-of-crashkernel-resources.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kdump-defer-the-insertion-of-crashkernel-resources.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Subject: kdump: defer the insertion of crashkernel resources
Date: Fri, 29 Dec 2023 16:02:13 +0800
In /proc/iomem, sub-regions should be inserted after their parent,
otherwise the insertion of parent resource fails. But after generic
crashkernel reservation applied, in both RISC-V and ARM64 (LoongArch will
also use generic reservation later on), crashkernel resources are inserted
before their parent, which causes the parent disappear in /proc/iomem. So
we defer the insertion of crashkernel resources to an early_initcall().
1, Without 'crashkernel' parameter:
100d0100-100d01ff : LOON0001:00
100d0100-100d01ff : LOON0001:00 LOON0001:00
100e0000-100e0bff : LOON0002:00
100e0000-100e0bff : LOON0002:00 LOON0002:00
1fe001e0-1fe001e7 : serial
90400000-fa17ffff : System RAM
f6220000-f622ffff : Reserved
f9ee0000-f9ee3fff : Reserved
fa120000-fa17ffff : Reserved
fa190000-fe0bffff : System RAM
fa190000-fa1bffff : Reserved
fe4e0000-47fffffff : System RAM
43c000000-441ffffff : Reserved
47ff98000-47ffa3fff : Reserved
47ffa4000-47ffa7fff : Reserved
47ffa8000-47ffabfff : Reserved
47ffac000-47ffaffff : Reserved
47ffb0000-47ffb3fff : Reserved
2, With 'crashkernel' parameter, before this patch:
100d0100-100d01ff : LOON0001:00
100d0100-100d01ff : LOON0001:00 LOON0001:00
100e0000-100e0bff : LOON0002:00
100e0000-100e0bff : LOON0002:00 LOON0002:00
1fe001e0-1fe001e7 : serial
e6200000-f61fffff : Crash kernel
fa190000-fe0bffff : System RAM
fa190000-fa1bffff : Reserved
fe4e0000-47fffffff : System RAM
43c000000-441ffffff : Reserved
47ff98000-47ffa3fff : Reserved
47ffa4000-47ffa7fff : Reserved
47ffa8000-47ffabfff : Reserved
47ffac000-47ffaffff : Reserved
47ffb0000-47ffb3fff : Reserved
3, With 'crashkernel' parameter, after this patch:
100d0100-100d01ff : LOON0001:00
100d0100-100d01ff : LOON0001:00 LOON0001:00
100e0000-100e0bff : LOON0002:00
100e0000-100e0bff : LOON0002:00 LOON0002:00
1fe001e0-1fe001e7 : serial
90400000-fa17ffff : System RAM
e6200000-f61fffff : Crash kernel
f6220000-f622ffff : Reserved
f9ee0000-f9ee3fff : Reserved
fa120000-fa17ffff : Reserved
fa190000-fe0bffff : System RAM
fa190000-fa1bffff : Reserved
fe4e0000-47fffffff : System RAM
43c000000-441ffffff : Reserved
47ff98000-47ffa3fff : Reserved
47ffa4000-47ffa7fff : Reserved
47ffa8000-47ffabfff : Reserved
47ffac000-47ffaffff : Reserved
47ffb0000-47ffb3fff : Reserved
Link: https://lkml.kernel.org/r/20231229080213.2622204-1-chenhuacai@xxxxxxxxxxx
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Fixes: 0ab97169aa051 ("crash_core: add generic function to do reservation")
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/crash_core.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
--- a/kernel/crash_core.c~kdump-defer-the-insertion-of-crashkernel-resources
+++ a/kernel/crash_core.c
@@ -377,7 +377,6 @@ static int __init reserve_crashkernel_lo
crashk_low_res.start = low_base;
crashk_low_res.end = low_base + low_size - 1;
- insert_resource(&iomem_resource, &crashk_low_res);
#endif
return 0;
}
@@ -459,8 +458,19 @@ retry:
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
- insert_resource(&iomem_resource, &crashk_res);
}
+
+static __init int insert_crashkernel_resources(void)
+{
+ if (crashk_res.start < crashk_res.end)
+ insert_resource(&iomem_resource, &crashk_res);
+
+ if (crashk_low_res.start < crashk_low_res.end)
+ insert_resource(&iomem_resource, &crashk_low_res);
+
+ return 0;
+}
+early_initcall(insert_crashkernel_resources);
#endif
int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
_
Patches currently in -mm which might be from chenhuacai@xxxxxxxxxxx are
kdump-defer-the-insertion-of-crashkernel-resources.patch
