lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

x86: e820: Remove conditional early mapping in parse_e820_ext

Browse Source 
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>
This commit is contained in:
Sebastian Andrzej Siewior
2011-02-22 21:07:36 +01:00
committed by Thomas Gleixner
parent cb4cfd568c
commit f1c2b35714
3 changed files with 16 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
arch/x86/kernel/setup.c
View File

@@ -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);
}
}