Messages in this thread Patch in this message | | | From | Rusty Russell <> | Subject | Re: kernel BUG at kernel/kallsyms.c:222! | Date | Fri, 08 Nov 2013 10:14:44 +1030 |
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Axel Lin <axel.lin@ingics.com> writes: > 2013/11/7 Ming Lei <tom.leiming@gmail.com>: >> Hi, >> >> On Thu, Nov 7, 2013 at 10:47 AM, Axel Lin <axel.lin@ingics.com> wrote: >>> >>> hi Ming, >>> Seems CONFIG_PAGE_OFFSET is not configurabe in "make menuconfig". >>> And I found CONFIG_PAGE_OFFSET=0xC0000000 for all below configs... >>> $ make at91_dt_defconfig; grep CONFIG_PAGE_OFFSET .config >>> $ make ep93xx_defconfig; grep CONFIG_PAGE_OFFSET .config >>> $ make imx_v4_v5_defconfig; grep CONFIG_PAGE_OFFSET .config >>> $ make mxs_defconfig; grep CONFIG_PAGE_OFFSET .config >>> $ make omap2plus_defconfig; grep CONFIG_PAGE_OFFSET .config >>> $ make s3c6400_defconfig; grep CONFIG_PAGE_OFFSET .config >>> $ make at91x40_defconfig; grep CONFIG_PAGE_OFFSET .config >>> ( at91x40_defconfig is also arm7tdmi ) >> >> Firstly it can be configured via VMSPLIT_3GVMSPLIT_2G/VMSPLIT_1G. >> >> Secondly, configurable or not isn't the point, and maybe some uclinux >> platforms do not use CONFIG_PAGE_OFFSET at all, but they should >> set it as a reasonable value or at least be below than the start link >> address of vmlinux. > > Hi Ming, > > I found in arch/arm/include/asm/memory.h: > CONFIG_PAGE_OFFSET is not used if !CONFIG_MMU. > So looks like setting CONFIG_PAGE_OFFSET to other value still won't work.
This seems like the simplest solution, but it may mean you still have crap in /proc/kallsyms.
Does it work for you?
Thanks, Rusty.
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 32b10f53d0b4..c3bd3efec4cc 100644 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -82,7 +82,9 @@ kallsyms() kallsymopt="${kallsymopt} --all-symbols" fi - kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET" + if [ -n "${CONFIG_MMU}" ]; then + kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET" + fi local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
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