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-rw-r--r--arch/x86_64/kernel/suspend.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c
index fe865ea4df52..4ca523d58a5b 100644
--- a/arch/x86_64/kernel/suspend.c
+++ b/arch/x86_64/kernel/suspend.c
@@ -13,6 +13,9 @@
13#include <asm/page.h> 13#include <asm/page.h>
14#include <asm/pgtable.h> 14#include <asm/pgtable.h>
15 15
16/* References to section boundaries */
17extern const void __nosave_begin, __nosave_end;
18
16struct saved_context saved_context; 19struct saved_context saved_context;
17 20
18unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx; 21unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx;
@@ -220,4 +223,15 @@ int swsusp_arch_resume(void)
220 restore_image(); 223 restore_image();
221 return 0; 224 return 0;
222} 225}
226
227/*
228 * pfn_is_nosave - check if given pfn is in the 'nosave' section
229 */
230
231int pfn_is_nosave(unsigned long pfn)
232{
233 unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
234 unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
235 return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
236}
223#endif /* CONFIG_SOFTWARE_SUSPEND */ 237#endif /* CONFIG_SOFTWARE_SUSPEND */