litmus-rt.git - The LITMUS^RT kernel.

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#!/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 $nm = ($ENV{'NM'} || "nm") . " -p"; my $objdump = ($ENV{'OBJDUMP'} || "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$: || m:arch/x86/kernel/vsyscall-syms.o$: || 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) = @_;


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