linux-kernel - Re: [PATCH] MIPS: Ignore relocs against __ex

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Message-ID: <20250226104340.3f0b961b@gandalf.local.home>
Date: Wed, 26 Feb 2025 10:43:40 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Xi Ruoyao <xry111@...111.site>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Jiaxun Yang
 <jiaxun.yang@...goat.com>, Matt Redfearn <matt.redfearn@...ize.com>,
 linux-mips@...r.kernel.org, linux-kbuild@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Ignore relocs against __ex_table for relocatable
 kernel

On Wed, 26 Feb 2025 21:28:41 +0800
Xi Ruoyao <xry111@...111.site> wrote:

> Since commit 6f2c2f93a190 ("scripts/sorttable: Remove unneeded
> Elf_Rel"), sorttable no longer clears relocs against __ex_table,
> claiming "it was never used."  But in fact MIPS relocatable kernel had
> been implicitly depending on this behavior, so after this commit the
> MIPS relocatable kernel has started to spit oops like:

 Oops!

> 
> 	CPU 1 Unable to handle kernel paging request at virtual address 000000fffbbdbff8, epc == ffffffff818f9a6c, ra == ffffffff813ad7d0
> 	... ...
> 	Call Trace:
> 	[<ffffffff818f9a6c>] __raw_copy_from_user+0x48/0x2fc
> 	[<ffffffff813ad7d0>] cp_statx+0x1a0/0x1e0
> 	[<ffffffff813ae528>] do_statx_fd+0xa8/0x118
> 	[<ffffffff813ae670>] sys_statx+0xd8/0xf8
> 	[<ffffffff81156cc8>] syscall_common+0x34/0x58
> 
> So ignore those relocs on our own to fix the issue.
> 
> Fixes: 6f2c2f93a190 ("scripts/sorttable: Remove unneeded Elf_Rel")
> Signed-off-by: Xi Ruoyao <xry111@...111.site>

Thanks! Yeah, this is better than having an implicit dependency to the
sorttable code.

I take it that this will go through the mips tree?

-- Steve