x86: e820: Remove conditional early mapping in parse_e820_ext

This patch ensures that the memory passed from parse_setup_data() is
large enough to cover the complete data structure. That means that the
conditional mapping in parse_e820_ext() can go.

While here, I also attempt not to map two pages if the address is not
aligned to a page boundary.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Cc: sodaville@linutronix.de
Cc: devicetree-discuss@lists.ozlabs.org
LKML-Reference: <1298405266-1624-2-git-send-email-bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
index e99d55d..908b969 100644 (file)
--- a/arch/x86/include/asm/e820.h
+++ b/arch/x86/include/asm/e820.h
@@ -96,7 +96,7 @@ extern void e820_setup_gap(void);
 extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
                        unsigned long start_addr, unsigned long long end_addr);
 struct setup_data;
-extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
+extern void parse_e820_ext(struct setup_data *data);
 
 #if defined(CONFIG_X86_64) || \
        (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 294f26d..5fad626 100644 (file)
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -667,21 +667,15 @@ __init void e820_setup_gap(void)
  * boot_params.e820_map, others are passed via SETUP_E820_EXT node of
  * linked list of struct setup_data, which is parsed here.
  */
-void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data)
+void __init parse_e820_ext(struct setup_data *sdata)
 {
-       u32 map_len;
        int entries;
        struct e820entry *extmap;
 
        entries = sdata->len / sizeof(struct e820entry);
-       map_len = sdata->len + sizeof(struct setup_data);
-       if (map_len > PAGE_SIZE)
-               sdata = early_ioremap(pa_data, map_len);
        extmap = (struct e820entry *)(sdata->data);
        __append_e820_map(extmap, entries);
        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
-       if (map_len > PAGE_SIZE)
-               early_iounmap(sdata, map_len);
        printk(KERN_INFO "extended physical RAM map:\n");
        e820_print_map("extended");
 }

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index ca2f106..9521483 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -429,16 +429,27 @@ static void __init parse_setup_data(void)
                return;
        pa_data = boot_params.hdr.setup_data;
        while (pa_data) {
-               data = early_memremap(pa_data, PAGE_SIZE);
+               u32 data_len, map_len;
+
+               map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
+                             (u64)sizeof(struct setup_data));
+               data = early_memremap(pa_data, map_len);
+               data_len = data->len + sizeof(struct setup_data);
+               if (data_len > map_len) {
+                       early_iounmap(data, map_len);
+                       data = early_memremap(pa_data, data_len);
+                       map_len = data_len;
+               }
+
                switch (data->type) {
                case SETUP_E820_EXT:
-                       parse_e820_ext(data, pa_data);
+                       parse_e820_ext(data);
                        break;
                default:
                        break;
                }
                pa_data = data->next;
-               early_iounmap(data, PAGE_SIZE);
+               early_iounmap(data, map_len);
        }
 }