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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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arch/um/kernel/mem.c
+8 -5
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@@ -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);