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

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Date:   Fri, 20 May 2022 23:41:13 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: linux-next: changed messages in qemu boot

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