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Commit af540689 authored by Richard Kennedy's avatar Richard Kennedy Committed by Rusty Russell
Browse files

module: reorder struct module to save space on 64 bit builds 



reorder struct module to save space on 64 bit builds.
saves 1 cacheline_size  (128 on default x86_64 & 64 on AMD
Opteron/athlon) when CONFIG_MODULE_UNLOAD=y.

Signed-off-by: default avatarRichard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent dafd0940

include/linux/module.h

+22 −20
Original line number Diff line number Diff line
@@ -249,27 +249,28 @@ struct module 


	/* Exported symbols */

	const struct kernel_symbol *syms;

	unsigned int num_syms;

	const unsigned long *crcs;

	unsigned int num_syms;



	/* GPL-only exported symbols. */

	const struct kernel_symbol *gpl_syms;

	unsigned int num_gpl_syms;

	const struct kernel_symbol *gpl_syms;

	const unsigned long *gpl_crcs;



	/* unused exported symbols. */

	const struct kernel_symbol *unused_syms;

	unsigned int num_unused_syms;

	const unsigned long *unused_crcs;

	unsigned int num_unused_syms;



	/* GPL-only, unused exported symbols. */

	const struct kernel_symbol *unused_gpl_syms;

	unsigned int num_unused_gpl_syms;

	const struct kernel_symbol *unused_gpl_syms;

	const unsigned long *unused_gpl_crcs;



	/* symbols that will be GPL-only in the near future. */

	const struct kernel_symbol *gpl_future_syms;

	unsigned int num_gpl_future_syms;

	const unsigned long *gpl_future_crcs;

	unsigned int num_gpl_future_syms;



	/* Exception table */

	unsigned int num_exentries;
@@ -300,23 +301,9 @@ struct module 


#ifdef CONFIG_GENERIC_BUG

	/* Support for BUG */

	unsigned num_bugs;

	struct list_head bug_list;

	struct bug_entry *bug_table;

	unsigned num_bugs;

#endif



#ifdef CONFIG_MODULE_UNLOAD

	/* Reference counts */

	struct module_ref ref[NR_CPUS];



	/* What modules depend on me? */

	struct list_head modules_which_use_me;



	/* Who is waiting for us to be unloaded */

	struct task_struct *waiter;



	/* Destruction function. */

	void (*exit)(void);

#endif



#ifdef CONFIG_KALLSYMS
@@ -342,6 +329,21 @@ struct module 
	struct marker *markers;

	unsigned int num_markers;

#endif



#ifdef CONFIG_MODULE_UNLOAD

	/* What modules depend on me? */

	struct list_head modules_which_use_me;



	/* Who is waiting for us to be unloaded */

	struct task_struct *waiter;



	/* Destruction function. */

	void (*exit)(void);



	/* Reference counts */

	struct module_ref ref[NR_CPUS];

#endif



};

#ifndef MODULE_ARCH_INIT

#define MODULE_ARCH_INIT {}