[PATCH] uml: locking comments in iomem driver

Comment some lack of locking in the iomem driver.

Also, a couple of variables are in the wrong place, so they are moved.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index abafa64b8727..22d3cf359669 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -398,6 +398,23 @@ __uml_setup("mem=", uml_mem_setup,
 "       Example: mem=64M\n\n"
 );
 
+extern int __init parse_iomem(char *str, int *add);
+
+__uml_setup("iomem=", parse_iomem,
+"iomem=<name>,<file>\n"
+"    Configure <file> as an IO memory region named <name>.\n\n"
+);
+
+/*
+ * This list is constructed in parse_iomem and addresses filled in in
+ * setup_iomem, both of which run during early boot.  Afterwards, it's
+ * unchanged.
+ */
+struct iomem_region *iomem_regions = NULL;
+
+/* Initialized in parse_iomem */
+int iomem_size = 0;
+
 unsigned long find_iomem(char *driver, unsigned long *len_out)
 {
         struct iomem_region *region = iomem_regions;