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Subject[PATCH 11/12] x86/fixmap: add a predicate for usermode fixmaps
Date
Some set of fixmaps are intented to be mapped into usermode.  Add a
predicate to test for those fixmaps.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/include/asm/fixmap.h | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index b15c865..026ee10 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -183,6 +183,24 @@ static inline void __set_fixmap(enum fixed_addresses idx,

extern void __this_fixmap_does_not_exist(void);

+static inline bool user_fixmap(enum fixed_addresses fixmap)
+{
+ switch (fixmap) {
+#ifdef CONFIG_X86_32
+ case FIX_HOLE ... FIX_VDSO:
+#else
+ case VSYSCALL_LAST_PAGE ... VSYSCALL_HPET:
+#ifdef CONFIG_PARAVIRT_CLOCK_VSYSCALL
+ case FIX_PVCLOCK_TIME_INFO:
+#endif
+#endif
+ return true;
+
+ default:
+ return false;
+ }
+}
+
/*
* 'index to address' translation. If anyone tries to use the idx
* directly without translation, we catch the bug with a NULL-deference
--
1.6.2.5


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