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    Subject[PATCH] checkstack: pirnt module names
    From: Randy Dunlap <rdunlap@xenotime.net>

    Finding "init_module" high stack usage problems is challenging
    when there are over 1600 "init_module" functions in the kernel tree,
    so make checkstack.pl print out the filename where the stack usage
    occurs. This is useful for code built as loadable modules.

    For built-in code, it just prints the kernel image file name,
    like "vmlinux". Examples:

    (before patch:)
    0x0000000d callback: 1928
    0xffffffff81678c09 huft_build: 1560
    0x0018 init_module: 1512

    (after patch:)
    0x0000000d callback [divacapi]: 1928
    0xffffffff81678c09 huft_build [vmlinux]: 1560
    0x0018 init_module [hdaps]: 1512

    Also change one if-series to use elsif to cut down on
    unneeded tests.

    Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
    ---
    scripts/checkstack.pl | 14 ++++++++++++--
    1 files changed, 12 insertions(+), 2 deletions(-)

    --- linux-2617-rc5mm3.orig/scripts/checkstack.pl
    +++ linux-2617-rc5mm3/scripts/checkstack.pl
    @@ -89,11 +89,21 @@ sub bysize($) {
    #
    my $funcre = qr/^$x* <(.*)>:$/;
    my $func;
    +my $file, $lastslash;
    +
    while (my $line = <STDIN>) {
    if ($line =~ m/$funcre/) {
    $func = $1;
    }
    - if ($line =~ m/$re/) {
    + elsif ($line =~ m/(.*):\s*file format/) {
    + $file = $1;
    + $file =~ s/\.ko//;
    + $lastslash = rindex($file, "/");
    + if ($lastslash != -1) {
    + $file = substr($file, $lastslash + 1);
    + }
    + }
    + elsif ($line =~ m/$re/) {
    my $size = $1;
    $size = hex($size) if ($size =~ /^0x/);

    @@ -109,7 +119,7 @@ while (my $line = <STDIN>) {
    $addr =~ s/ /0/g;
    $addr = "0x$addr";

    - my $intro = "$addr $func:";
    + my $intro = "$addr $func [$file]:";
    my $padlen = 56 - length($intro);
    while ($padlen > 0) {
    $intro .= ' ';

    ---
    -
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