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Commit 1328710b authored by Daniel Micay's avatar Daniel Micay Committed by Tejun Heo
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mark most percpu globals as __ro_after_init 



Moving pcpu_base_addr to this section comes from PaX where it's part of
KERNEXEC. This extends it to the rest of the globals only written by the
init code.

Signed-off-by: default avatarDaniel Micay <danielmicay@gmail.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 56868a46

mm/percpu.c

+18 −18
Original line number Original line Diff line number Diff line
@@ -121,35 +121,35 @@ struct pcpu_chunk { 
	unsigned long		populated[];	/* populated bitmap */

	unsigned long		populated[];	/* populated bitmap */

};

};





static int pcpu_unit_pages __read_mostly;

static int pcpu_unit_pages __ro_after_init;

static int pcpu_unit_size __read_mostly;

static int pcpu_unit_size __ro_after_init;

static int pcpu_nr_units __read_mostly;

static int pcpu_nr_units __ro_after_init;

static int pcpu_atom_size __read_mostly;

static int pcpu_atom_size __ro_after_init;

static int pcpu_nr_slots __read_mostly;

static int pcpu_nr_slots __ro_after_init;

static size_t pcpu_chunk_struct_size __read_mostly;

static size_t pcpu_chunk_struct_size __ro_after_init;





/* cpus with the lowest and highest unit addresses */

/* cpus with the lowest and highest unit addresses */

static unsigned int pcpu_low_unit_cpu __read_mostly;

static unsigned int pcpu_low_unit_cpu __ro_after_init;

static unsigned int pcpu_high_unit_cpu __read_mostly;

static unsigned int pcpu_high_unit_cpu __ro_after_init;





/* the address of the first chunk which starts with the kernel static area */

/* the address of the first chunk which starts with the kernel static area */

void *pcpu_base_addr __read_mostly;

void *pcpu_base_addr __ro_after_init;

EXPORT_SYMBOL_GPL(pcpu_base_addr);

EXPORT_SYMBOL_GPL(pcpu_base_addr);





static const int *pcpu_unit_map __read_mostly;		/* cpu -> unit */

static const int *pcpu_unit_map __ro_after_init;		/* cpu -> unit */

const unsigned long *pcpu_unit_offsets __read_mostly;	/* cpu -> unit offset */

const unsigned long *pcpu_unit_offsets __ro_after_init;	/* cpu -> unit offset */





/* group information, used for vm allocation */

/* group information, used for vm allocation */

static int pcpu_nr_groups __read_mostly;

static int pcpu_nr_groups __ro_after_init;

static const unsigned long *pcpu_group_offsets __read_mostly;

static const unsigned long *pcpu_group_offsets __ro_after_init;

static const size_t *pcpu_group_sizes __read_mostly;

static const size_t *pcpu_group_sizes __ro_after_init;





/*

/*

 * The first chunk which always exists.  Note that unlike other

 * The first chunk which always exists.  Note that unlike other

 * chunks, this one can be allocated and mapped in several different

 * chunks, this one can be allocated and mapped in several different

 * ways and thus often doesn't live in the vmalloc area.

 * ways and thus often doesn't live in the vmalloc area.

 */

 */

static struct pcpu_chunk *pcpu_first_chunk;

static struct pcpu_chunk *pcpu_first_chunk __ro_after_init;





/*

/*

 * Optional reserved chunk.  This chunk reserves part of the first

 * Optional reserved chunk.  This chunk reserves part of the first
@@ -158,13 +158,13 @@ static struct pcpu_chunk *pcpu_first_chunk; 
 * area doesn't exist, the following variables contain NULL and 0

 * area doesn't exist, the following variables contain NULL and 0

 * respectively.

 * respectively.

 */

 */

static struct pcpu_chunk *pcpu_reserved_chunk;

static struct pcpu_chunk *pcpu_reserved_chunk __ro_after_init;

static int pcpu_reserved_chunk_limit;

static int pcpu_reserved_chunk_limit __ro_after_init;





static DEFINE_SPINLOCK(pcpu_lock);	/* all internal data structures */

static DEFINE_SPINLOCK(pcpu_lock);	/* all internal data structures */

static DEFINE_MUTEX(pcpu_alloc_mutex);	/* chunk create/destroy, [de]pop, map ext */

static DEFINE_MUTEX(pcpu_alloc_mutex);	/* chunk create/destroy, [de]pop, map ext */





static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */

static struct list_head *pcpu_slot __ro_after_init; /* chunk list slots */





/* chunks which need their map areas extended, protected by pcpu_lock */

/* chunks which need their map areas extended, protected by pcpu_lock */

static LIST_HEAD(pcpu_map_extend_chunks);

static LIST_HEAD(pcpu_map_extend_chunks);