linux-kernel - Re: [PATCH] blackfin: Makefile: Skip reloc overflow issue when COMPILE

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Date:	Wed, 22 Apr 2015 17:00:36 +0800
From:	Steven Miao <realmz6@...il.com>
To:	Chen Gang <xili_gchen_5257@...mail.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	bfin <adi-buildroot-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blackfin: Makefile: Skip reloc overflow issue when
 COMPILE_TEST enabled

Hi,

On Thu, Apr 9, 2015 at 5:03 AM, Chen Gang <xili_gchen_5257@...mail.com> wrote:
> l1_text is at L1_CODE_START (e.g. for bf533, 0xff800000). If the kernel
> is too big, it may be overwritten, the related issue:
>
>     LD      init/built-in.o
>   init/built-in.o: In function `do_early_param':
>   init/main.c:(.init.text+0xe0): relocation truncated to fit: R_BFIN_PCREL24 against symbol `strcmp' defined in .l1.text section in arch/blackfin/lib/lib.a(strcmp.o)
>   init/main.c:(.init.text+0x10e): relocation truncated to fit: R_BFIN_PCREL24 against symbol `strcmp' defined in .l1.text section in arch/blackfin/lib/lib.a(strcmp.o)
blackfin toolchain generate 24 bit pc-relative calls by default, with
a range of –16,777,216 through 16,777,214 (0xFF00 0000 to 0x00FF FFFE)
is available.
So call to l1_text should be ok. What do you mean the kernel is too big?
http://docs.blackfin.uclinux.org/doku.php?id=ism:call


>   init/built-in.o: In function `unknown_bootoption':
>
> blackfin is for embedded system, the size limitition is acceptable, so
> it is not the real world issue, which should be skipped if COMPILE_TEST
> enabled.
>
>
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> ---
>  arch/blackfin/Makefile | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/blackfin/Makefile b/arch/blackfin/Makefile
> index 2ece4e3..e5195b4 100644
> --- a/arch/blackfin/Makefile
> +++ b/arch/blackfin/Makefile
> @@ -20,6 +20,9 @@ endif
>  KBUILD_AFLAGS           += $(call cc-option,-mno-fdpic)
>  KBUILD_CFLAGS_MODULE    += -mlong-calls
>  LDFLAGS                 += -m elf32bfin
> +ifeq ($(CONFIG_COMPILE_TEST),y)
> +LDFLAGS                 += --noinhibit-exec
> +endif
>
>  KBUILD_DEFCONFIG := BF537-STAMP_defconfig
>
> --
> 1.9.3
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