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uml: SMP locking commentary

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Add some more commentary about various pieces of global data not needing
locking.

Also got rid of unmap_physmem since that is no longer used.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:31:17 -08:00 committed by Linus Torvalds
parent 3a24ebf0cb
commit 80e39311ff
4 changed files with 17 additions and 10 deletions
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7
arch/um/drivers/net_kern.c
View file

@ -368,7 +368,6 @@ static struct platform_driver uml_net_driver = {
.name = DRIVER_NAME,
},
};
static int driver_registered;
static void net_device_release(struct device *dev)
{
@ -383,6 +382,12 @@ static void net_device_release(struct device *dev)
free_netdev(netdev);
}
/*
* Ensures that platform_driver_register is called only once by
* eth_configure. Will be set in an initcall.
*/
static int driver_registered;
static void eth_configure(int n, void *init, char *mac,
struct transport *transport)
{

1
arch/um/include/mem_user.h
View file

@ -56,7 +56,6 @@ extern void setup_physmem(unsigned long start, unsigned long usable,
unsigned long len, unsigned long long highmem);
extern void add_iomem(char *name, int fd, unsigned long size);
extern unsigned long phys_offset(unsigned long phys);
extern void unmap_physmem(void);
extern void map_memory(unsigned long virt, unsigned long phys,
unsigned long len, int r, int w, int x);

13
arch/um/kernel/mem.c
View file

@ -22,17 +22,20 @@
unsigned long *empty_zero_page = NULL;
/* allocated in paging_init and unchanged thereafter */
unsigned long *empty_bad_page = NULL;
/*
* Initialized during boot, and readonly for initializing page tables
* afterwards
*/
pgd_t swapper_pg_dir[PTRS_PER_PGD];
/* Initialized at boot time, and readonly after that */
unsigned long long highmem;
int kmalloc_ok = 0;
/* Used during early boot */
static unsigned long brk_end;
void unmap_physmem(void)
{
os_unmap_memory((void *) brk_end, uml_reserved - brk_end);
}
static void map_cb(void *unused)
{
map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);

6
arch/um/kernel/physmem.c
View file

@ -164,10 +164,10 @@ __uml_setup("iomem=", parse_iomem,
* setup_iomem, both of which run during early boot. Afterwards, it's
* unchanged.
*/
struct iomem_region *iomem_regions = NULL;
struct iomem_region *iomem_regions;
/* Initialized in parse_iomem */
int iomem_size = 0;
/* Initialized in parse_iomem and unchanged thereafter */
int iomem_size;
unsigned long find_iomem(char *driver, unsigned long *len_out)
{