diff options
| author | Jeff Dike <jdike@addtoit.com> | 2008-02-04 22:31:17 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:30 -0800 |
| commit | 80e39311ff3d7d2267ea8d259aab8dc9d5a59d61 (patch) | |
| tree | 141c6adb305a57cc8284580d88a839343f57ee90 /arch/um | |
| parent | 3a24ebf0cb2ca44fdcdb5cae9ed2e778e5170f97 (diff) | |
uml: SMP locking commentary
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>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/drivers/net_kern.c | 7 | ||||
| -rw-r--r-- | arch/um/include/mem_user.h | 1 | ||||
| -rw-r--r-- | arch/um/kernel/mem.c | 13 | ||||
| -rw-r--r-- | arch/um/kernel/physmem.c | 6 |
4 files changed, 17 insertions, 10 deletions
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c index 3c6c44ca1ffa..ca71577f3630 100644 --- a/arch/um/drivers/net_kern.c +++ b/arch/um/drivers/net_kern.c @@ -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) { diff --git a/arch/um/include/mem_user.h b/arch/um/include/mem_user.h index 4e6707bd0a08..46384acd547b 100644 --- a/arch/um/include/mem_user.h +++ b/arch/um/include/mem_user.h @@ -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); diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 663011c2983f..d948babfc67a 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -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); diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c index 9c9290005792..9757085a0220 100644 --- a/arch/um/kernel/physmem.c +++ b/arch/um/kernel/physmem.c @@ -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) { |