Re: [PATCH] kbuild: add symbol prefix arg to kallsyms

From: Bob Liu
Date: Fri Sep 07 2012 - 05:16:47 EST


Hi James,

On Fri, Sep 7, 2012 at 5:11 AM, James Hogan <james@xxxxxxxxxxxxx> wrote:
> Commit 1f2bfbd00e466ff3489b2ca5cc75b1cccd14c123 ("kbuild: link of
> vmlinux moved to a script") introduced in v3.5-rc1 broke kallsyms on
> architectures which have symbol prefixes.
>
> The --symbol-prefix argument used to be added to the KALLSYMS command
> line from the architecture Makefile, however this isn't picked up by the
> new scripts/link-vmlinux.sh. This resulted in symbols like
> kallsyms_addresses being added which weren't correctly overriding the
> weak symbols such as _kallsyms_addresses. These could then trigger
> BUG_ONs in kallsyms code.
>
> This is fixed by removing the KALLSYMS addition from the architecture
> Makefile, and using CONFIG_SYMBOL_PREFIX in the link-vmlinux.sh script
> to determine whether to add the --symbol-prefix argument.
>
> Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>

Yes, we also found this issue. Thank you for your fix.
I'll apply it soon.

> ---
> arch/blackfin/Makefile | 1 -
> scripts/link-vmlinux.sh | 7 ++++++-
> 2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/blackfin/Makefile b/arch/blackfin/Makefile
> index d3d7e64..66cf000 100644
> --- a/arch/blackfin/Makefile
> +++ b/arch/blackfin/Makefile
> @@ -20,7 +20,6 @@ endif
> KBUILD_AFLAGS += $(call cc-option,-mno-fdpic)
> KBUILD_CFLAGS_MODULE += -mlong-calls
> LDFLAGS += -m elf32bfin
> -KALLSYMS += --symbol-prefix=_
>
> KBUILD_DEFCONFIG := BF537-STAMP_defconfig
>
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index 4629038..df48dda 100644
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -74,8 +74,13 @@ kallsyms()
> info KSYM ${2}
> local kallsymopt;
>
> + if [ -n "${CONFIG_SYMBOL_PREFIX}" ]; then
> + kallsymopt="${kallsymopt} \
> + --symbol-prefix=${CONFIG_SYMBOL_PREFIX}"
> + fi
> +
> if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
> - kallsymopt=--all-symbols
> + kallsymopt="${kallsymopt} --all-symbols"
> fi
>
> local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
> --
> 1.7.7.6
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/

--
Regards,
--Bob
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/