introduce size_param()

With there being several instances of custom_param() where the handler
is just invoking parse_size_and_unit(), it seems to make sense to
introduce a simplifying abstraction.

Also fix serial_txbufsz not having been guaranteed to be a power of
two.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index 971d723109..9dadffec73 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -92,6 +92,21 @@ void cmdline_parse(char *cmdline)
                     bool_assert = !bool_assert;
                 *(int *)param->var = bool_assert;
                 break;
+            case OPT_SIZE: {
+                uint64_t sz = parse_size_and_unit(optval, NULL);
+                switch ( param->len )
+                {
+                case sizeof(uint32_t):
+                    *(uint32_t *)param->var = sz;
+                    break;
+                case sizeof(uint64_t):
+                    *(uint64_t *)param->var = sz;
+                    break;
+                default:
+                    BUG();
+                }
+                break;
+            }
             case OPT_CUSTOM:
                 ((void (*)(const char *))param->var)(optval);
                 break;