From f7f567b95b12eda7a6a273b8cb82d152491bc0da Mon Sep 17 00:00:00 2001 From: Zhen Lei Date: Sat, 27 May 2023 20:34:36 +0800 Subject: 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 Acked-by: Baoquan He Cc: Cong Wang Cc: Eric W. Biederman Cc: Michael Holzheu Signed-off-by: Andrew Morton --- kernel/kexec_core.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'kernel/kexec_core.c') diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index d1ab139dd490..bcc86a250ab3 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -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); -- cgit