Messages in this thread | | | Date | Tue, 7 Apr 2020 20:25:19 +0800 | From | Jiaxun Yang <> | Subject | Re: BUG: mips: errors when compiling kernel with a large initramfs |
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On Tue, 7 Apr 2020 17:58:23 +0800 "Xu, Yanfei" <yanfei.xu@windriver.com> wrote:
> Hi, > > > It fails to compile mips kernel with large initramfs (at link time). > > kernel version: 5.6.0 > > > Steps to reproduce: > > 1. git clone mainline kernel > > 2. set ARCH=mips and CROSS_COMPILE=mips-linux-gnu- > > 3. make defconfig > > 4.enable initramfs support and set the path about initramfs source > file > > 5.make -j24 > > [KEY] when your initramfs files is too large, and cause > usr/initramfs_data.cpio.gz > > compiled is larger than 225M, you will get the following error. BTW, > x86 doesn't > > have this issue that I have tested. > > ------------------------------error > messages----------------------------------------- > > CHK include/generated/compile.h > LD vmlinux.o > MODPOST vmlinux.o > MODINFO modules.builtin.modinfo > GEN modules.builtin > LD .tmp_vmlinux.kallsyms1 > kernel/configs.o: In function `ikconfig_cleanup': > /home/wrsadmin/work/linux/kernel/linux-master/kernel/configs.c:72:(.exit.text+0x8): > relocation truncated to fit: R_MIPS_26 against `remove_proc_entry' > fs/binfmt_script.o: In function `exit_script_binfmt': > /home/wrsadmin/work/linux/kernel/linux-master/fs/binfmt_script.c:165:(.exit.text+0x4): > relocation truncated to fit: R_MIPS_26 against `unregister_binfmt' > fs/binfmt_elf.o: In function `exit_elf_binfmt': > /home/wrsadmin/work/linux/kernel/linux-master/fs/binfmt_elf.c:2393:(.exit.text+0x4): > relocation truncated to fit: R_MIPS_26 against `unregister_binfmt' > fs/mbcache.o: In function `mbcache_exit': > /home/wrsadmin/work/linux/kernel/linux-master/fs/mbcache.c:429:(.exit.text+0x4): > relocation truncated to fit: R_MIPS_26 against `kmem_cache_destroy' > fs/nfs_common/grace.o: In function `exit_grace': > /home/wrsadmin/work/linux/kernel/linux-master/fs/nfs_common/grace.c:133:(.exit.text+0x4): > relocation truncated to fit: R_MIPS_26 against > `unregister_pernet_subsys' fs/ext4/super.o: In function > `ext4_destroy_lazyinit_thread': > /home/wrsadmin/work/linux/kernel/linux-master/fs/ext4/super.c:3456:(.exit.text+0x24): > relocation truncated to fit: R_MIPS_26 against `kthread_stop' > fs/ext4/super.o: In function `unregister_as_ext2': > /home/wrsadmin/work/linux/kernel/linux-master/fs/ext4/super.c:6126:(.exit.text+0x30): > relocation truncated to fit: R_MIPS_26 against > `unregister_filesystem' fs/ext4/super.o: In function > `unregister_as_ext3': > /home/wrsadmin/work/linux/kernel/linux-master/fs/ext4/super.c:6155:(.exit.text+0x3c): > relocation truncated to fit: R_MIPS_26 against > `unregister_filesystem' fs/ext4/super.o: In function `ext4_exit_fs': > /home/wrsadmin/work/linux/kernel/linux-master/fs/ext4/super.c:6261:(.exit.text+0x48): > relocation truncated to fit: R_MIPS_26 against > `unregister_filesystem' fs/ext4/super.o: In function > `destroy_inodecache': > /home/wrsadmin/work/linux/kernel/linux-master/fs/ext4/super.c:1218:(.exit.text+0x50): > relocation truncated to fit: R_MIPS_26 against `rcu_barrier' > /home/wrsadmin/work/linux/kernel/linux-master/fs/ext4/super.c:1219:(.exit.text+0x5c): > additional relocation overflows omitted from the output > Makefile:1086: recipe for target 'vmlinux' failed make[1]: *** > [vmlinux] Error 1 Makefile:1058: recipe for target > 'autoksyms_recursive' failed make: *** [autoksyms_recursive] Error 2 > > > Any comment will be appreciated.
Actually I think that won't work even if you managed to workaround reloc issue.
MIPS have limited LOW MEM range accessible via KSEG0 (512M, but can be less if your system place some MMIO register in that range). Kernel image will be placed here together with built-in initramfs, and a lot of memory like Page Table can only be allocated from here.
Such a huge initrd will occupy the whole LOW MEM range leaving no space for others.
It seems like your system is 32bit, we have no solution for that hardware limitaion. For 64bit system you may try to move your kernel into XKPHYS instead of KSEG0.
Thanks
-- Jiaxun Yang
> > Thanks, > > Yanfei >
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