Messages in this thread Patch in this message | | | From | Zhen Lei <> | Subject | [PATCH] arm64: add the printing of tpidr_elx in __show_regs() | Date | Tue, 15 Mar 2022 19:09:26 +0800 |
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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@huawei.com> --- 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
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