From 80e39311ff3d7d2267ea8d259aab8dc9d5a59d61 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Mon, 4 Feb 2008 22:31:17 -0800 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/mem.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'arch/um/kernel/mem.c') diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 663011c2983..d948babfc67 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); -- cgit v1.2.3-18-g5258