linux-kernel - Re: [PATCH] vmlinux.lds.h: catch .bss..L* sections into BSS")

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Message-Id: <1a9e8039-0bf8-40b4-ad07-a51ea569b7b2@app.fastmail.com>
Date: Fri, 12 Jul 2024 08:53:08 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Christophe Leroy" <christophe.leroy@...roup.eu>,
 "Alexander Lobakin" <alobakin@...me>,
 "Nathan Chancellor" <nathan@...nel.org>, "Kees Cook" <kees@...nel.org>,
 "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 Linux-Arch <linux-arch@...r.kernel.org>,
 "Peter Zijlstra" <peterz@...radead.org>, "kernel test robot" <lkp@...el.com>
Subject: Re: [PATCH] vmlinux.lds.h: catch .bss..L* sections into BSS")

On Fri, Jul 12, 2024, at 07:51, Christophe Leroy wrote:
> Commit 9a427556fb8e ("vmlinux.lds.h: catch compound literals into
> data and BSS") added catches for .data..L* and .rodata..L* but missed
> .bss..L*
>
> Since commit 5431fdd2c181 ("ptrace: Convert ptrace_attach() to use
> lock guards") the following appears at build:
>
>   LD      .tmp_vmlinux.kallsyms1
> powerpc64-linux-ld: warning: orphan section `.bss..Lubsan_data33' from 
> `kernel/ptrace.o' being placed in section `.bss..Lubsan_data33'
>   NM      .tmp_vmlinux.kallsyms1.syms
>   KSYMS   .tmp_vmlinux.kallsyms1.S
>   AS      .tmp_vmlinux.kallsyms1.S
>   LD      .tmp_vmlinux.kallsyms2
> powerpc64-linux-ld: warning: orphan section `.bss..Lubsan_data33' from 
> `kernel/ptrace.o' being placed in section `.bss..Lubsan_data33'
>   NM      .tmp_vmlinux.kallsyms2.syms
>   KSYMS   .tmp_vmlinux.kallsyms2.S
>   AS      .tmp_vmlinux.kallsyms2.S
>   LD      vmlinux
> powerpc64-linux-ld: warning: orphan section `.bss..Lubsan_data33' from 
> `kernel/ptrace.o' being placed in section `.bss..Lubsan_data33'
>
> Lets add .bss..L* to BSS_MAIN macro to catch those sections into BSS.
>
> Fixes: 9a427556fb8e ("vmlinux.lds.h: catch compound literals into data 
> and BSS")
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: 
> https://lore.kernel.org/oe-kbuild-all/202404031349.nmKhyuUG-lkp@intel.com/

Applied to the asm-generic tree, thanks!

         Arnd