x86, setup: Let early_memremap() handle page alignment

early_memremap() takes care of page alignment and map size, so we can
just remap the required data size and get rid of the adjustments in
the setup code.

[tglx: Massaged changelog ]

Signed-off-by: WANG Chao <chaowang@redhat.com>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Link: http://lkml.kernel.org/r/1420628150-16872-1-git-send-email-chaowang@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 5 deletions

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index ab4734e5411d..c4648adadd7d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -431,15 +431,13 @@ static void __init parse_setup_data(void)
 
         pa_data = boot_params.hdr.setup_data;
         while (pa_data) {
-                u32 data_len, map_len, data_type;
+                u32 data_len, data_type;
 
-                map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
-                              (u64)sizeof(struct setup_data));
-                data = early_memremap(pa_data, map_len);
+                data = early_memremap(pa_data, sizeof(*data));
                 data_len = data->len + sizeof(struct setup_data);
                 data_type = data->type;
                 pa_next = data->next;
-                early_iounmap(data, map_len);
+                early_iounmap(data, sizeof(*data));
 
                 switch (data_type) {
                 case SETUP_E820_EXT: