linux-kernel - Re: [PATCH 2/2] namespace.pl : update file exclusion list

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Date:	Wed, 29 Sep 2010 12:43:22 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] namespace.pl : update file exclusion list

On Tue, Sep 28, 2010 at 05:44:03PM +0900, Stephen Hemminger wrote:
>The list of exceptions in kernel tree was out of date. Convert
>the long list of if clauses to a hashes which is more efficient
>and more common in perl.
>
>Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
>
>--- a/scripts/namespace.pl	2010-09-28 09:28:52.251563058 +0900
>+++ b/scripts/namespace.pl	2010-09-28 15:13:38.092073114 +0900
>@@ -84,6 +84,58 @@ my %ksymtab = ();	# names that appear in
> 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 $name
> 
>+my %nmexception = (
>+    'fs/ext3/bitmap'			=> 1,
>+    'fs/ext4/bitmap'			=> 1,
>+    'arch/x86/lib/thunk_32'		=> 1,
>+    'arch/x86/lib/cmpxchg'		=> 1,
>+    'arch/x86/vdso/vdso32/note'		=> 1,
>+    'lib/irq_regs'			=> 1,
>+    'usr/initramfs_data'		=> 1,
>+    'drivers/scsi/aic94xx/aic94xx_dump'	=> 1,
>+    'drivers/scsi/libsas/sas_dump'	=> 1,
>+    'lib/dec_and_lock'			=> 1,
>+    'drivers/ide/ide-probe-mini'	=> 1,
>+    'usr/initramfs_data'		=> 1,
>+    'drivers/acpi/acpia/exdump'		=> 1,
>+    'drivers/acpi/acpia/rsdump'		=> 1,
>+    'drivers/acpi/acpia/nsdumpdv'	=> 1,
>+    'drivers/acpi/acpia/nsdump'		=> 1,
>+    'arch/ia64/sn/kernel/sn2/io'	=> 1,
>+    'arch/ia64/kernel/gate-data'	=> 1,
>+    'security/capability'		=> 1,
>+    'fs/ntfs/sysctl'			=> 1,
>+    'fs/jfs/jfs_debug'			=> 1,
>+);
>+
>+my %nameexception = (
>+    'mod_use_count_'	 => 1,
>+    '__initramfs_end'	=> 1,
>+    '__initramfs_start'	=> 1,
>+    '_einittext'	=> 1,
>+    '_sinittext'	=> 1,
>+    'kallsyms_names'	=> 1,
>+    'kallsyms_num_syms'	=> 1,
>+    'kallsyms_addresses'=> 1,
>+    '__this_module'	=> 1,
>+    '_etext'		=> 1,
>+    '_edata'		=> 1,
>+    '_end'		=> 1,
>+    '__bss_start'	=> 1,
>+    '_text'		=> 1,
>+    '_stext'		=> 1,
>+    '__gp'		=> 1,
>+    'ia64_unw_start'	=> 1,
>+    'ia64_unw_end'	=> 1,
>+    '__init_begin'	=> 1,
>+    '__init_end'	=> 1,
>+    '__bss_stop'	=> 1,
>+    '__nosave_begin'	=> 1,
>+    '__nosave_end'	=> 1,
>+    'pg0'		=> 1,
>+);
>+
>+
> &find(\&linux_objects, '.');	# find the objects and do_nm on them
> &list_multiply_defined();
> &resolve_external_references();
>@@ -272,27 +324,9 @@ sub do_nm
> 	close($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;
>+	    printf "No nm data for $fullname\n"
>+		unless $nmexception{$fullname};
>+	    return;
> 	}
> 	$nmdata{$fullname} = \@nmdata;
> }
>@@ -374,31 +408,7 @@ sub resolve_external_references
> 						$ref{$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"
>+				elsif ( ! $nameexception{$name}
> 					&& $name !~ /^__sched_text_/
> 					&& $name !~ /^__start_/
> 					&& $name !~ /^__end_/
>@@ -409,7 +419,6 @@ sub resolve_external_references
> 					&& $name !~ /^__.*per_cpu_end/
> 					&& $name !~ /^__alt_instructions/
> 					&& $name !~ /^__setup_/
>-					&& $name !~ /^jiffies/


I don't check all the symbols you updated, but why did you remove 'jiffies'?
It is defined externally by the linker too.
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