[PATCH] arm64: add the printing of tpidr_elx in __show_regs()

[Zhen Lei]

Commit 7158627686f0 ("arm64: percpu: implement optimised pcpu access
using tpidr_el1") and commit 6d99b68933fb ("arm64: alternatives: use
tpidr_el2 on VHE hosts") use tpidr_elx to cache my_cpu_offset to optimize
pcpu access. However, when performing reverse execution based on the
registers and the memory contents in kdump, this information is sometimes
required if there is a pcpu access.

Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
---
 arch/arm64/kernel/process.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 5369e649fa79ff8..14924810a1d9d76 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -216,6 +216,9 @@ void __show_regs(struct pt_regs *regs)
 	show_regs_print_info(KERN_DEFAULT);
 	print_pstate(regs);
 
+	if (IS_ENABLED(CONFIG_SMP))
+		printk("tpidr : %016lx\n", this_cpu_ptr(NULL));
+
 	if (!user_mode(regs)) {
 		printk("pc : %pS\n", (void *)regs->pc);
 		printk("lr : %pS\n", (void *)ptrauth_strip_insn_pac(lr));
-- 
2.25.1