#!/usr/bin/perl -w## namespace.pl. Mon Aug 30 2004## Perform a name space analysis on the linux kernel.## Copyright Keith Owens <kaos@ocs.com.au>. GPL.## Invoke by changing directory to the top of the kernel object# tree then namespace.pl, no parameters.## Tuned for 2.1.x kernels with the new module handling, it will# work with 2.0 kernels as well.## Last change 2.6.9-rc1, adding support for separate source and object# trees.## The source must be compiled/assembled first, the object files# are the primary input to this script. Incomplete or missing# objects will result in a flawed analysis. Compile both vmlinux# and modules.## Even with complete objects, treat the result of the analysis# with caution. Some external references are only used by# certain architectures, others with certain combinations of# configuration parameters. Ideally the source should include# something like## #ifndef CONFIG_...# static# #endif# symbol_definition;## so the symbols are defined as static unless a particular# CONFIG_... requires it to be external.## A symbol that is suffixed with '(export only)' has these properties## * It is global.# * It is marked EXPORT_SYMBOL or EXPORT_SYMBOL_GPL, either in the same# source file or a different source file.# * Given the current .config, nothing uses the symbol.## The symbol is a candidate for conversion to static, plus removal of the# export. But be careful that a different .config might use the symbol.### Name space analysis and cleanup is an iterative process. You cannot# expect to find all the problems in a single pass.## * Identify possibly unnecessary global declarations, verify that they# really are unnecessary and change them to static.# * Compile and fix up gcc warnings about static, removing dead symbols# as necessary.# * make clean and rebuild with different configs (especially# CONFIG_MODULES=n) to see which symbols are being defined when the# config does not require them. These symbols bloat the kernel object# for no good reason, which is frustrating for embedded systems.# * Wrap config sensitive symbols in #ifdef CONFIG_foo, as long as the# code does not get too ugly.# * Repeat the name space analysis until you can live with with the# result.# require 5; # at least perl 5use strict;use File::Find; my $nm = "/usr/bin/nm -p";my $objdump = "/usr/bin/objdump -s -j .comment";my $srctree = "";my $objtree = "";$srctree = "$ENV{'srctree'}/" if (exists($ENV{'srctree'}));$objtree = "$ENV{'objtree'}/" if (exists($ENV{'objtree'})); if ($#ARGV != -1) { print STDERR "usage: $0 takes no parameters\n"; die("giving up\n");} my %nmdata = (); # nm data for each objectmy %def = (); # all definitions for each namemy %ksymtab = (); # names that appear in __ksymtab_my %ref = (); # $ref{$name} exists if there is a true external reference to $namemy %export = (); # $export{$name} exists if there is an EXPORT_... of $name &find(\&linux_objects, '.'); # find the objects and do_nm on them&list_multiply_defined();&resolve_external_references();&list_extra_externals(); exit(0); sub linux_objects{ # Select objects, ignoring objects which are only created by # merging other objects. Also ignore all of modules, scripts # and compressed. Most conglomerate objects are handled by do_nm, # this list only contains the special cases. These include objects # that are linked from just one other object and objects for which # there is really no permanent source file. my $basename = $_; $_ = $File::Find::name; s:^\./::; if (/.*\.o$/ && ! ( m:/built-in.o$: || m:arch/i386/kernel/vsyscall-syms.o$: || m:arch/ia64/ia32/ia32.o$: || m:arch/ia64/kernel/gate-syms.o$: || m:arch/ia64/lib/__divdi3.o$: || m:arch/ia64/lib/__divsi3.o$: || m:arch/ia64/lib/__moddi3.o$: || m:arch/ia64/lib/__modsi3.o$: || m:arch/ia64/lib/__udivdi3.o$: || m:arch/ia64/lib/__udivsi3.o$: || m:arch/ia64/lib/__umoddi3.o$: || m:arch/ia64/lib/__umodsi3.o$: || m:arch/ia64/scripts/check_gas_for_hint.o$: || m:arch/ia64/sn/kernel/xp.o$: || m:boot/bbootsect.o$: || m:boot/bsetup.o$: || m:/bootsect.o$: || m:/boot/setup.o$: || m:/compressed/: || m:drivers/cdrom/driver.o$: || m:drivers/char/drm/tdfx_drv.o$: || m:drivers/ide/ide-detect.o$: || m:drivers/ide/pci/idedriver-pci.o$: || m:drivers/media/media.o$: || m:drivers/scsi/sd_mod.o$: || m:drivers/video/video.o$: || m:fs/devpts/devpts.o$: || m:fs/exportfs/exportfs.o$: || m:fs/hugetlbfs/hugetlbfs.o$: || m:fs/msdos/msdos.o$: || m:fs/nls/nls.o$: || m:fs/ramfs/ramfs.o$: || m:fs/romfs/romfs.o$: || m:fs/vfat/vfat.o$: || m:init/mounts.o$: || m:^modules/: || m:net/netlink/netlink.o$: || m:net/sched/sched.o$: || m:/piggy.o$: || m:^scripts/: || m:sound/.*/snd-: || m:^.*/\.tmp_: || m:^\.tmp_: || m:/vmlinux-obj.o$: ) ) { do_nm($basename, $_); } $_ = $basename; # File::Find expects $_ untouched (undocumented)} sub do_nm{ my ($basename, $fullname) = @_; my ($source, $type, $name); if (! -e $basename) { printf STDERR "$basename does not exist\n"; return; } if ($fullname !~ /\.o$/) { printf STDERR "$fullname is not an object file\n"; return; } ($source = $fullname) =~ s/\.o$//; if (-e "$objtree$source.c" || -e "$objtree$source.S") { $source = "$objtree$source"; } else { $source = "$srctree$source"; } if (! -e "$source.c" && ! -e "$source.S") { # No obvious source, exclude the object if it is conglomerate if (! open(OBJDUMPDATA, "$objdump $basename|")) { printf STDERR "$objdump $fullname failed $!\n"; return; } my $comment; while (<OBJDUMPDATA>) { chomp(); if (/^In archive/) { # Archives are always conglomerate $comment = "GCC:GCC:"; last; } next if (! /^[ 0-9a-f]{5,} /); $comment .= substr($_, 43); } close(OBJDUMPDATA); if (!defined($comment) || $comment !~ /GCC\:.*GCC\:/m) { printf STDERR "No source file found for $fullname\n"; } return; } if (! open(NMDATA, "$nm $basename|")) { printf STDERR "$nm $fullname failed $!\n"; return; } my @nmdata; while (<NMDATA>) { chop; ($type, $name) = (split(/ +/, $_, 3))[1..2]; # Expected types # A absolute symbol # B weak external reference to data that has been resolved # C global variable, uninitialised # D global variable, initialised # G global variable, initialised, small data section # R global array, initialised # S global variable, uninitialised, small bss # T global label/procedure # U external reference # W weak external reference to text that has been resolved # a assembler equate # b static variable, uninitialised # d static variable, initialised # g static variable, initialised, small data section # r static array, initialised # s static variable, uninitialised, small bss # t static label/procedures # w weak external reference to text that has not been resolved # ? undefined type, used a lot by modules if ($type !~ /^[ABCDGRSTUWabdgrstw?]$/) { printf STDERR "nm output for $fullname contains unknown type '$_'\n"; } elsif ($name =~ /\./) { # name with '.' is local static } else { $type = 'R' if ($type eq '?'); # binutils replaced ? with R at one point # binutils keeps changing the type for exported symbols, force it to R $type = 'R' if ($name =~ /^__ksymtab/ || $name =~ /^__kstrtab/); $name =~ s/_R[a-f0-9]{8}$//; # module versions adds this if ($type =~ /[ABCDGRSTW]/ && $name ne 'init_module' && $name ne 'cleanup_module' && $name ne 'Using_Versions' && $name !~ /^Version_[0-9]+$/ && $name !~ /^__parm_/ && $name !~ /^__kstrtab/ && $name !~ /^__ksymtab/ && $name !~ /^__kcrctab_/ && $name !~ /^__exitcall_/ && $name !~ /^__initcall_/ && $name !~ /^__kdb_initcall_/ && $name !~ /^__kdb_exitcall_/ && $name !~ /^__module_/ && $name !~ /^__mod_/ && $name !~ /^__crc_/ && $name ne '__this_module' && $name ne 'kernel_version') { if (!exists($def{$name})) { $def{$name} = []; } push(@{$def{$name}}, $fullname); } push(@nmdata, "$type $name"); if ($name =~ /^__ksymtab_/) { $name = substr($name, 10); if (!exists($ksymtab{$name})) { $ksymtab{$name} = []; } push(@{$ksymtab{$name}}, $fullname); } } } close(NMDATA); if ($#nmdata < 0) { if ( $fullname ne "lib/brlock.o" && $fullname ne "lib/dec_and_lock.o" && $fullname ne "fs/xfs/xfs_macros.o" && $fullname ne "drivers/ide/ide-probe-mini.o" && $fullname ne "usr/initramfs_data.o" && $fullname ne "drivers/acpi/executer/exdump.o" && $fullname ne "drivers/acpi/resources/rsdump.o" && $fullname ne "drivers/acpi/namespace/nsdumpdv.o" && $fullname ne "drivers/acpi/namespace/nsdump.o" && $fullname ne "arch/ia64/sn/kernel/sn2/io.o" && $fullname ne "arch/ia64/kernel/gate-data.o" && $fullname ne "drivers/ieee1394/oui.o" && $fullname ne "security/capability.o" && $fullname ne "sound/core/wrappers.o" && $fullname ne "fs/ntfs/sysctl.o" && $fullname ne "fs/jfs/jfs_debug.o" ) { printf "No nm data for $fullname\n"; } return; } $nmdata{$fullname} = \@nmdata;} sub drop_def{ my ($object, $name) = @_; my $nmdata = $nmdata{$object}; my ($i, $j); for ($i = 0; $i <= $#{$nmdata}; ++$i) { if ($name eq (split(' ', $nmdata->[$i], 2))[1]) { splice(@{$nmdata{$object}}, $i, 1); my $def = $def{$name}; for ($j = 0; $j < $#{$def{$name}}; ++$j) { if ($def{$name}[$j] eq $object) { splice(@{$def{$name}}, $j, 1); } } last; } }} sub list_multiply_defined{ my ($name, $module); foreach $name (keys(%def)) { if ($#{$def{$name}} > 0) { # Special case for cond_syscall if ($#{$def{$name}} == 1 && $name =~ /^sys_/ && ($def{$name}[0] eq "kernel/sys.o" || $def{$name}[1] eq "kernel/sys.o")) { &drop_def("kernel/sys.o", $name); next; } # Special case for i386 entry code if ($#{$def{$name}} == 1 && $name =~ /^__kernel_/ && $def{$name}[0] eq "arch/i386/kernel/vsyscall-int80.o" && $def{$name}[1] eq "arch/i386/kernel/vsyscall-sysenter.o") { &drop_def("arch/i386/kernel/vsyscall-sysenter.o", $name); next; } printf "$name is multiply defined in :-\n"; foreach $module (@{$def{$name}}) { printf "\t$module\n"; } } }} sub resolve_external_references{ my ($object, $type, $name, $i, $j, $kstrtab, $ksymtab, $export); printf "\n"; foreach $object (keys(%nmdata)) { my $nmdata = $nmdata{$object}; for ($i = 0; $i <= $#{$nmdata}; ++$i) { ($type, $name) = split(' ', $nmdata->[$i], 2); if ($type eq "U" || $type eq "w") { if (exists($def{$name}) || exists($ksymtab{$name})) { # add the owning object to the nmdata $nmdata->[$i] = "$type $name $object"; # only count as a reference if it is not EXPORT_... $kstrtab = "R __kstrtab_$name"; $ksymtab = "R __ksymtab_$name"; $export = 0; for ($j = 0; $j <= $#{$nmdata}; ++$j) { if ($nmdata->[$j] eq $kstrtab || $nmdata->[$j] eq $ksymtab) { $export = 1; last; } } if ($export) { $export{$name} = ""; } else { $ref{$name} = "" } } elsif ( $name ne "mod_use_count_" && $name ne "__initramfs_end" && $name ne "__initramfs_start" && $name ne "_einittext" && $name ne "_sinittext" && $name ne "kallsyms_names" && $name ne "kallsyms_num_syms" && $name ne "kallsyms_addresses" && $name ne "__this_module" && $name ne "_etext" && $name ne "_edata" && $name ne "_end" && $name ne "__bss_start" && $name ne "_text" && $name ne "_stext" && $name ne "__gp" && $name ne "ia64_unw_start" && $name ne "ia64_unw_end" && $name ne "__init_begin" && $name ne "__init_end" && $name ne "__bss_stop" && $name ne "__nosave_begin" && $name ne "__nosave_end" && $name ne "pg0" && $name ne "__module_text_address" && $name !~ /^__sched_text_/ && $name !~ /^__start_/ && $name !~ /^__end_/ && $name !~ /^__stop_/ && $name !~ /^__scheduling_functions_.*_here/ && $name !~ /^__.*initcall_/ && $name !~ /^__.*per_cpu_start/ && $name !~ /^__.*per_cpu_end/ && $name !~ /^__alt_instructions/ && $name !~ /^__setup_/ ) { printf "Cannot resolve "; printf "weak " if ($type eq "w"); printf "reference to $name from $object\n"; } } } }} sub list_extra_externals{ my %noref = (); my ($name, @module, $module, $export); foreach $name (keys(%def)) { if (! exists($ref{$name})) { @module = @{$def{$name}}; foreach $module (@module) { if (! exists($noref{$module})) { $noref{$module} = []; } push(@{$noref{$module}}, $name); } } } if (%noref) { printf "\nExternally defined symbols with no external references\n"; foreach $module (sort(keys(%noref))) { printf " $module\n"; foreach (sort(@{$noref{$module}})) { if (exists($export{$_})) { $export = " (export only)"; } else { $export = ""; } printf " $_$export\n"; } } }}
#!/usr/bin/perl -w
#
# namespace.pl. Mon Aug 30 2004
#
# Perform a name space analysis on the linux kernel.
#
# Copyright Keith Owens <kaos@ocs.com.au>. GPL.
#
# Invoke by changing directory to the top of the kernel object
# tree then namespace.pl, no parameters.
#
# Tuned for 2.1.x kernels with the new module handling, it will
# work with 2.0 kernels as well.
#
# Last change 2.6.9-rc1, adding support for separate source and object
# trees.
#
# The source must be compiled/assembled first, the object files
# are the primary input to this script. Incomplete or missing
# objects will result in a flawed analysis. Compile both vmlinux
# and modules.
#
# Even with complete objects, treat the result of the analysis
# with caution. Some external references are only used by
# certain architectures, others with certain combinations of
# configuration parameters. Ideally the source should include
# something like
#
# #ifndef CONFIG_...
# static
# #endif
# symbol_definition;
#
# so the symbols are defined as static unless a particular
# CONFIG_... requires it to be external.
#
# A symbol that is suffixed with '(export only)' has these properties
#
# * It is global.
# * It is marked EXPORT_SYMBOL or EXPORT_SYMBOL_GPL, either in the same
# source file or a different source file.
# * Given the current .config, nothing uses the symbol.
#
# The symbol is a candidate for conversion to static, plus removal of the
# export. But be careful that a different .config might use the symbol.
#
#
# Name space analysis and cleanup is an iterative process. You cannot
# expect to find all the problems in a single pass.
#
# * Identify possibly unnecessary global declarations, verify that they
# really are unnecessary and change them to static.
# * Compile and fix up gcc warnings about static, removing dead symbols
# as necessary.
# * make clean and rebuild with different configs (especially
# CONFIG_MODULES=n) to see which symbols are being defined when the
# config does not require them. These symbols bloat the kernel object
# for no good reason, which is frustrating for embedded systems.
# * Wrap config sensitive symbols in #ifdef CONFIG_foo, as long as the
# code does not get too ugly.
# * Repeat the name space analysis until you can live with with the
# result.
#
require 5; # at least perl 5
use strict;
use File::Find;
my $nm = "/usr/bin/nm -p";
my $objdump = "/usr/bin/objdump -s -j .comment";
my $srctree = "";
my $objtree = "";
$srctree = "$ENV{'srctree'}/" if (exists($ENV{'srctree'}));
$objtree = "$ENV{'objtree'}/" if (exists($ENV{'objtree'}));
if ($#ARGV != -1) {
print STDERR "usage: $0 takes no parameters\n";
die("giving up\n");
}
my %nmdata = (); # nm data for each object
my %def = (); # all definitions for each name
my %ksymtab = (); # names that appear in __ksymtab_
my %ref = (); # $ref{$name} exists if there is a true external reference to $name
my %export = (); # $export{$name} exists if there is an EXPORT_... of $name
&find(\&linux_objects, '.'); # find the objects and do_nm on them
&list_multiply_defined();
&resolve_external_references();
&list_extra_externals();
exit(0);
sub linux_objects
{
# Select objects, ignoring objects which are only created by
# merging other objects. Also ignore all of modules, scripts
# and compressed. Most conglomerate objects are handled by do_nm,
# this list only contains the special cases. These include objects
# that are linked from just one other object and objects for which
# there is really no permanent source file.
my $basename = $_;
$_ = $File::Find::name;
s:^\./::;
if (/.*\.o$/ &&
! (
m:/built-in.o$:
|| m:arch/i386/kernel/vsyscall-syms.o$:
|| m:arch/ia64/ia32/ia32.o$:
|| m:arch/ia64/kernel/gate-syms.o$:
|| m:arch/ia64/lib/__divdi3.o$:
|| m:arch/ia64/lib/__divsi3.o$:
|| m:arch/ia64/lib/__moddi3.o$:
|| m:arch/ia64/lib/__modsi3.o$:
|| m:arch/ia64/lib/__udivdi3.o$:
|| m:arch/ia64/lib/__udivsi3.o$:
|| m:arch/ia64/lib/__umoddi3.o$:
|| m:arch/ia64/lib/__umodsi3.o$:
|| m:arch/ia64/scripts/check_gas_for_hint.o$:
|| m:arch/ia64/sn/kernel/xp.o$:
|| m:boot/bbootsect.o$:
|| m:boot/bsetup.o$:
|| m:/bootsect.o$:
|| m:/boot/setup.o$:
|| m:/compressed/:
|| m:drivers/cdrom/driver.o$:
|| m:drivers/char/drm/tdfx_drv.o$:
|| m:drivers/ide/ide-detect.o$:
|| m:drivers/ide/pci/idedriver-pci.o$:
|| m:drivers/media/media.o$:
|| m:drivers/scsi/sd_mod.o$:
|| m:drivers/video/video.o$:
|| m:fs/devpts/devpts.o$:
|| m:fs/exportfs/exportfs.o$:
|| m:fs/hugetlbfs/hugetlbfs.o$:
|| m:fs/msdos/msdos.o$:
|| m:fs/nls/nls.o$:
|| m:fs/ramfs/ramfs.o$:
|| m:fs/romfs/romfs.o$:
|| m:fs/vfat/vfat.o$:
|| m:init/mounts.o$:
|| m:^modules/:
|| m:net/netlink/netlink.o$:
|| m:net/sched/sched.o$:
|| m:/piggy.o$:
|| m:^scripts/:
|| m:sound/.*/snd-:
|| m:^.*/\.tmp_:
|| m:^\.tmp_:
|| m:/vmlinux-obj.o$:
)
) {
do_nm($basename, $_);
}
$_ = $basename; # File::Find expects $_ untouched (undocumented)
}
sub do_nm
{
my ($basename, $fullname) = @_;
my ($source, $type, $name);
if (! -e $basename) {
printf STDERR "$basename does not exist\n";
return;
}
if ($fullname !~ /\.o$/) {
printf STDERR "$fullname is not an object file\n";
return;
}
($source = $fullname) =~ s/\.o$//;
if (-e "$objtree$source.c" || -e "$objtree$source.S") {
$source = "$objtree$source";
} else {
$source = "$srctree$source";
}
if (! -e "$source.c" && ! -e "$source.S") {
# No obvious source, exclude the object if it is conglomerate
if (! open(OBJDUMPDATA, "$objdump $basename|")) {
printf STDERR "$objdump $fullname failed $!\n";
return;
}
my $comment;
while (<OBJDUMPDATA>) {
chomp();
if (/^In archive/) {
# Archives are always conglomerate
$comment = "GCC:GCC:";
last;
}
next if (! /^[ 0-9a-f]{5,} /);
$comment .= substr($_, 43);
}
close(OBJDUMPDATA);
if (!defined($comment) || $comment !~ /GCC\:.*GCC\:/m) {
printf STDERR "No source file found for $fullname\n";
}
return;
}
if (! open(NMDATA, "$nm $basename|")) {
printf STDERR "$nm $fullname failed $!\n";
return;
}
my @nmdata;
while (<NMDATA>) {
chop;
($type, $name) = (split(/ +/, $_, 3))[1..2];
# Expected types
# A absolute symbol
# B weak external reference to data that has been resolved
# C global variable, uninitialised
# D global variable, initialised
# G global variable, initialised, small data section
# R global array, initialised
# S global variable, uninitialised, small bss
# T global label/procedure
# U external reference
# W weak external reference to text that has been resolved
# a assembler equate
# b static variable, uninitialised
# d static variable, initialised
# g static variable, initialised, small data section
# r static array, initialised
# s static variable, uninitialised, small bss
# t static label/procedures
# w weak external reference to text that has not been resolved
# ? undefined type, used a lot by modules
if ($type !~ /^[ABCDGRSTUWabdgrstw?]$/) {
printf STDERR "nm output for $fullname contains unknown type '$_'\n";
}
elsif ($name =~ /\./) {
# name with '.' is local static
}
else {
$type = 'R' if ($type eq '?'); # binutils replaced ? with R at one point
# binutils keeps changing the type for exported symbols, force it to R
$type = 'R' if ($name =~ /^__ksymtab/ || $name =~ /^__kstrtab/);
$name =~ s/_R[a-f0-9]{8}$//; # module versions adds this
if ($type =~ /[ABCDGRSTW]/ &&
$name ne 'init_module' &&
$name ne 'cleanup_module' &&
$name ne 'Using_Versions' &&
$name !~ /^Version_[0-9]+$/ &&
$name !~ /^__parm_/ &&
$name !~ /^__kstrtab/ &&
$name !~ /^__ksymtab/ &&
$name !~ /^__kcrctab_/ &&
$name !~ /^__exitcall_/ &&
$name !~ /^__initcall_/ &&
$name !~ /^__kdb_initcall_/ &&
$name !~ /^__kdb_exitcall_/ &&
$name !~ /^__module_/ &&
$name !~ /^__mod_/ &&
$name !~ /^__crc_/ &&
$name ne '__this_module' &&
$name ne 'kernel_version') {
if (!exists($def{$name})) {
$def{$name} = [];
}
push(@{$def{$name}}, $fullname);
}
push(@nmdata, "$type $name");
if ($name =~ /^__ksymtab_/) {
$name = substr($name, 10);
if (!exists($ksymtab{$name})) {
$ksymtab{$name} = [];
}
push(@{$ksymtab{$name}}, $fullname);
}
}
}
close(NMDATA);
if ($#nmdata < 0) {
if (
$fullname ne "lib/brlock.o"
&& $fullname ne "lib/dec_and_lock.o"
&& $fullname ne "fs/xfs/xfs_macros.o"
&& $fullname ne "drivers/ide/ide-probe-mini.o"
&& $fullname ne "usr/initramfs_data.o"
&& $fullname ne "drivers/acpi/executer/exdump.o"
&& $fullname ne "drivers/acpi/resources/rsdump.o"
&& $fullname ne "drivers/acpi/namespace/nsdumpdv.o"
&& $fullname ne "drivers/acpi/namespace/nsdump.o"
&& $fullname ne "arch/ia64/sn/kernel/sn2/io.o"
&& $fullname ne "arch/ia64/kernel/gate-data.o"
&& $fullname ne "drivers/ieee1394/oui.o"
&& $fullname ne "security/capability.o"
&& $fullname ne "sound/core/wrappers.o"
&& $fullname ne "fs/ntfs/sysctl.o"
&& $fullname ne "fs/jfs/jfs_debug.o"
) {
printf "No nm data for $fullname\n";
}
return;
}
$nmdata{$fullname} = \@nmdata;
}
sub drop_def
{
my ($object, $name) = @_;
my $nmdata = $nmdata{$object};
my ($i, $j);
for ($i = 0; $i <= $#{$nmdata}; ++$i) {
if ($name eq (split(' ', $nmdata->[$i], 2))[1]) {
splice(@{$nmdata{$object}}, $i, 1);
my $def = $def{$name};
for ($j = 0; $j < $#{$def{$name}}; ++$j) {
if ($def{$name}[$j] eq $object) {
splice(@{$def{$name}}, $j, 1);
}
}
last;
}
}
}
sub list_multiply_defined
{
my ($name, $module);
foreach $name (keys(%def)) {
if ($#{$def{$name}} > 0) {
# Special case for cond_syscall
if ($#{$def{$name}} == 1 && $name =~ /^sys_/ &&
($def{$name}[0] eq "kernel/sys.o" ||
$def{$name}[1] eq "kernel/sys.o")) {
&drop_def("kernel/sys.o", $name);
next;
}
# Special case for i386 entry code
if ($#{$def{$name}} == 1 && $name =~ /^__kernel_/ &&
$def{$name}[0] eq "arch/i386/kernel/vsyscall-int80.o" &&
$def{$name}[1] eq "arch/i386/kernel/vsyscall-sysenter.o") {
&drop_def("arch/i386/kernel/vsyscall-sysenter.o", $name);
next;
}
printf "$name is multiply defined in :-\n";
foreach $module (@{$def{$name}}) {
printf "\t$module\n";
}
}
}
}
sub resolve_external_references
{
my ($object, $type, $name, $i, $j, $kstrtab, $ksymtab, $export);
printf "\n";
foreach $object (keys(%nmdata)) {
my $nmdata = $nmdata{$object};
for ($i = 0; $i <= $#{$nmdata}; ++$i) {
($type, $name) = split(' ', $nmdata->[$i], 2);
if ($type eq "U" || $type eq "w") {
if (exists($def{$name}) || exists($ksymtab{$name})) {
# add the owning object to the nmdata
$nmdata->[$i] = "$type $name $object";
# only count as a reference if it is not EXPORT_...
$kstrtab = "R __kstrtab_$name";
$ksymtab = "R __ksymtab_$name";
$export = 0;
for ($j = 0; $j <= $#{$nmdata}; ++$j) {
if ($nmdata->[$j] eq $kstrtab ||
$nmdata->[$j] eq $ksymtab) {
$export = 1;
last;
}
}
if ($export) {
$export{$name} = "";
}
else {
$ref{$name} = ""
}
}
elsif ( $name ne "mod_use_count_"
&& $name ne "__initramfs_end"
&& $name ne "__initramfs_start"
&& $name ne "_einittext"
&& $name ne "_sinittext"
&& $name ne "kallsyms_names"
&& $name ne "kallsyms_num_syms"
&& $name ne "kallsyms_addresses"
&& $name ne "__this_module"
&& $name ne "_etext"
&& $name ne "_edata"
&& $name ne "_end"
&& $name ne "__bss_start"
&& $name ne "_text"
&& $name ne "_stext"
&& $name ne "__gp"
&& $name ne "ia64_unw_start"
&& $name ne "ia64_unw_end"
&& $name ne "__init_begin"
&& $name ne "__init_end"
&& $name ne "__bss_stop"
&& $name ne "__nosave_begin"
&& $name ne "__nosave_end"
&& $name ne "pg0"
&& $name ne "__module_text_address"
&& $name !~ /^__sched_text_/
&& $name !~ /^__start_/
&& $name !~ /^__end_/
&& $name !~ /^__stop_/
&& $name !~ /^__scheduling_functions_.*_here/
&& $name !~ /^__.*initcall_/
&& $name !~ /^__.*per_cpu_start/
&& $name !~ /^__.*per_cpu_end/
&& $name !~ /^__alt_instructions/
&& $name !~ /^__setup_/
) {
printf "Cannot resolve ";
printf "weak " if ($type eq "w");
printf "reference to $name from $object\n";
}
}
}
}
}
sub list_extra_externals
{
my %noref = ();
my ($name, @module, $module, $export);
foreach $name (keys(%def)) {
if (! exists($ref{$name})) {
@module = @{$def{$name}};
foreach $module (@module) {
if (! exists($noref{$module})) {
$noref{$module} = [];
}
push(@{$noref{$module}}, $name);
}
}
}
if (%noref) {
printf "\nExternally defined symbols with no external references\n";
foreach $module (sort(keys(%noref))) {
printf " $module\n";
foreach (sort(@{$noref{$module}})) {
if (exists($export{$_})) {
$export = " (export only)";
}
else {
$export = "";
}
printf " $_$export\n";
}
}
}
}