From 1c10070a55a38ad8489df8afd52c9a3ffd46bbb5 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 21 Jul 2007 17:11:09 +0200 Subject: i386: do not restore reserved memory after hibernation On some systems the ACPI NVS area is located in the first 1 MB of RAM and it is overwritten by the i386 code during the restore after hibernation. This confuses the ACPI platform firmware that doesn't update the AC adapter status appropriately as a result (http://bugzilla.kernel.org/show_bug.cgi?id=7995). The solution is to register the reserved memory in the first 1 MB as 'nosave', so that swsusp doesn't touch it during the restore. Also, this has been done on x86_64 for a long time now, so this patch makes the i386 restore code behave like the x86_64 one. [akpm@linux-foundation.org: build fix] Signed-off-by: Rafael J. Wysocki Acked-by: Pavel Machek Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-i386/e820.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/asm-i386/e820.h') diff --git a/include/asm-i386/e820.h b/include/asm-i386/e820.h index c03290ccecb2..43114c824608 100644 --- a/include/asm-i386/e820.h +++ b/include/asm-i386/e820.h @@ -47,6 +47,14 @@ extern void e820_register_memory(void); extern void limit_regions(unsigned long long size); extern void print_memory_map(char *who); +#if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND) +extern void e820_mark_nosave_regions(void); +#else +static inline void e820_mark_nosave_regions(void) +{ +} +#endif + #endif/*!__ASSEMBLY__*/ #endif/*__E820_HEADER*/ -- cgit v1.2.2