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kexec: clear crashk_res if all its memory has been released 

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@huawei.com
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Cong Wang <amwang@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zhen Lei 2023-05-27 20:34:36 +08:00 committed by Andrew Morton
parent 6f22a744f4
commit f7f567b95b
1 changed files with 7 additions and 4 deletions
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11
kernel/kexec_core.c
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@ -1137,15 +1137,18 @@ int crash_shrink_memory(unsigned long new_size)
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);