Re: [PATCH v4 mips-next 6/7] vmlinux.lds.h: catch compound literals into data and BSS

From: Nathan Chancellor <natechancellor@gmail.com>
To: Alexander Lobakin <alobakin@pm.me>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Fangrui Song <maskray@google.com>,
	Huacai Chen <chenhuacai@kernel.org>,
	Pei Huang <huangpei@loongson.cn>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	Ingo Molnar <mingo@kernel.org>,
	Ralf Baechle <ralf@linux-mips.org>,
	Corey Minyard <cminyard@mvista.com>,
	linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, stable@vger.kernel.org,
	clang-built-linux@googlegroups.com
Subject: Re: [PATCH v4 mips-next 6/7] vmlinux.lds.h: catch compound literals into data and BSS
Date: Fri, 8 Jan 2021 14:19:03 -0700	[thread overview]
Message-ID: <20210108211903.GF2547542@ubuntu-m3-large-x86> (raw)
In-Reply-To: <20210107132010.463129-3-alobakin@pm.me>

On Thu, Jan 07, 2021 at 01:20:55PM +0000, Alexander Lobakin wrote:
> When building kernel with LD_DEAD_CODE_DATA_ELIMINATION, LLVM stack
> generates separate sections for compound literals, just like in case
> with enabled LTO [0]:
> 
> ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o):
> (.data..compoundliteral.14) is being placed in
> '.data..compoundliteral.14'
> ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o):
> (.data..compoundliteral.15) is being placed in
> '.data..compoundliteral.15'
> ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o):
> (.data..compoundliteral.16) is being placed in
> '.data..compoundliteral.16'
> ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o):
> (.data..compoundliteral.17) is being placed in
> '.data..compoundliteral.17'
> 
> [...]
> 
> Handle this by adding the related sections to generic definitions
> as suggested by Sami [0].
> 
> [0] https://lore.kernel.org/lkml/20201211184633.3213045-3-samitolvanen@google.com
> 
> Suggested-by: Kees Cook <keescook@chromium.org>
> Signed-off-by: Alexander Lobakin <alobakin@pm.me>

Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>

> ---
>  include/asm-generic/vmlinux.lds.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index b2b3d81b1535..5f2f5b1db84f 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -95,10 +95,10 @@
>   */
>  #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
>  #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
> -#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX*
> +#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral*
>  #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
> -#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
> -#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
> +#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
> +#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
>  #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
>  #else
>  #define TEXT_MAIN .text
> -- 
> 2.30.0
> 
>