Re: [PATCH] reduce large stack usage

[Arnd Bergmann]

Randy.Dunlap wrote:

> This patch to 2.5.63 reduces stack usage in generate_default_upcase()
> from 0x3d4 bytes to just noise (on x86).

Since you are already fixing stack usage bugs in several places, maybe
you are interested in this list. I have it from building 2.5.63 with 
allyesconfig on s390x with gcc-2.95.3. The twofish one is obviously
broken, and I suspect huft_build/inflate_dynamic are the cause of the
crashes I'm seeing during unpacking of initramfs.

nfs4 and reiserfs look suspicious as well, but I've never used either
of them on s390x, so I can't tell if they are likely to cause
real problems.

        Arnd <><

8832 twofish_setkey
1696 dohash
1680 huft_build
1680 huft_build
1544 aes_encrypt
1512 inflate_dynamic
1496 inflate_dynamic
1448 device_new_if
1360 inflate_fixed
1360 inflate_fixed
1344 br_ioctl_device
1312 elf_core_dump
1264 sctp_hash_digest
1256 aes_decrypt
1248 gss_pipe_downcall
1248 befs_warning
1248 befs_error
1248 befs_debug
1232 ciGetLeafPrefixKey
1216 nfs4_proc_rename
1192 nfs4_proc_link
1184 root_nfs_name
1184 conmode_default
1136 elf_core_dump
1128 nfsd4_proc_compound
1112 generate_default_upcase
1072 nlmclnt_proc
1016 do_open
1000 reiserfs_rename
992 reiserfs_delete_solid_item
992 nfs4_proc_symlink
992 nfs4_proc_mknod
992 nfs4_proc_mkdir
968 nlmclnt_reclaim
936 reiserfs_delete_item
912 reiserfs_cut_from_item
896 extract_entropy
888 sha512_transform
872 udf_add_entry
840 reiserfs_insert_item
832 tcp_v4_conn_request
832 reiserfs_paste_into_item
824 nfs4_proc_lookup
824 hfs_cat_move
816 udf_load_pvoldesc
816 semctl_main
792 sys_shmctl

generated from:
objdump --disassemble vmlinux |
        grep '\(^0\|aghi.%r15\)' |
        sed -e 's/^0.*<\(.*\)>:/\1/g' -e 's/^ .*-/: /g' |
        while read a b ; do
                if [ $a = : ] ; then
                        echo $b $name
                fi
                name=$a
        done |
        sort -rn |
        head -n 40