linux-kernel - [PATCH 4/5] x86/fixmap: add a predicate for usermode fixmaps

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Date:	Mon,  5 Oct 2009 17:50:10 -0700
From:	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
To:	Xen-devel <xen-devel@...ts.xensource.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kurt.hackel@...cle.com,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Keir Fraser <keir.fraser@...citrix.com>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Chris Mason <chris.mason@...cle.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 4/5] x86/fixmap: add a predicate for usermode fixmaps

Some set of fixmaps are intented to be mapped into usermode.  Add an
predicate to test for those fixmaps.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.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 ff3cffa..0edc2bb 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -181,6 +181,24 @@ 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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