Subject: Re: linux-next: changed messages in qemu boot

From: "Naveen N. Rao" <[email-masked]>
Date: Fri, 20 May 2022 23:41:13 +0530

Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next bboot of the powerpc pseries_le_defconfig build
> produced these different kernel messages (diff from yesterday's tree):
> 
> - ftrace: allocating 33658 entries in 13 pages
> - ftrace: allocated 13 pages with 3 groups
> + ftrace-powerpc: Address of ftrace_regs_caller out of range of kernel_toc.

Thanks for the report. I think that is due to:
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/bb6626e8[email-masked]/

The below diff fixes it for me:

diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 46c002a8388804..7418da705d43ac 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -746,7 +746,7 @@ int __init ftrace_dyn_arch_init(void)
 
        reladdr = addr - kernel_toc_addr();
 
-       if (reladdr >= SZ_2G || reladdr < -SZ_2G) {
+       if (reladdr >= SZ_2G || reladdr < -_UL(SZ_2G)) {
                pr_err("Address of %ps out of range of kernel_toc.\n",
                                (void *)addr);
                return -1;

- Naveen