Re: BUG: mips: errors when compiling kernel with a large initramfs

[YunQiang Su]

Xu, Yanfei <yanfei.xu@xxxxxxxxxxxxx> ä2020å4æ7æåä äå5:58åéï
>
> 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

It is due to the JAL insn can only support <256MiB jump

>
> 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.

Maybe, you can have a try add  `-mlong-calls' to your CFLAGS.
I am not sure that it can work.
   https://gcc.gnu.org/onlinedocs/gcc/MIPS-Options.html

>
> Thanks,
>
> Yanfei
>


-- 
YunQiang Su