On 5/23/21 3:56 PM, Simon Horman wrote:
On Wed, May 19, 2021 at 11:16:21AM +0800, Pingfan Liu wrote:
Since kernel commit e2a073dde921 ("arm64: omit [_text, _stext) from
permanent kernel mapping"), the physical address of 'Kernel code' in
/proc/iomem is mapped from _text, instead, from _stext.
Change the code to cope with this kernel change.
Signed-off-by: Pingfan Liu <[email protected]>
Thanks, will kexec still work with older kernels with this change in place?
Oops, it will. Let me try to bring up another idea to tackle it.
Thanks,
Pingfan
---
kexec/arch/arm64/crashdump-arm64.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kexec/arch/arm64/crashdump-arm64.c
b/kexec/arch/arm64/crashdump-arm64.c
index 38d1a0f..1da663e 100644
--- a/kexec/arch/arm64/crashdump-arm64.c
+++ b/kexec/arch/arm64/crashdump-arm64.c
@@ -148,7 +148,11 @@ static int crash_get_memory_ranges(void)
* For additional kernel code/data segment.
* kern_paddr_start/kern_size are determined in iomem_range_callback
*/
- elf_info.kern_vaddr_start = get_kernel_sym("_text");
+ /* Refer to kernel:
+ * kernel_code.start = __pa_symbol(_stext);
+ * which is exported through /proc/iomem as "Kernel code"
+ */
+ elf_info.kern_vaddr_start = get_kernel_sym("_stext");
if (!elf_info.kern_vaddr_start)
elf_info.kern_vaddr_start = UINT64_MAX;
--
2.29.2
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