Re: linux-next: changed messages in qemu boot

Naveen N. Rao
2022-05-20T18:11:46Z

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/bb6626e884acffe87b58736291df57db3deaa9b9.1652074503.git.christophe.leroy@csgroup.eu/

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