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Subject[tip:x86/vdso] x86, vdso: Do conditional fixmap of VVAR and HPET page
Commit-ID:  eccca441fe1f6b416a3592d764686edb9fbd2ac6
Gitweb: http://git.kernel.org/tip/eccca441fe1f6b416a3592d764686edb9fbd2ac6
Author: stefani@seibold.net <stefani@seibold.net>
AuthorDate: Sun, 16 Feb 2014 22:52:48 +0100
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Sun, 16 Feb 2014 19:48:52 -0800

x86, vdso: Do conditional fixmap of VVAR and HPET page

This patch adds conditional fixmap of the VVAR and HPET pages for the
32 bit kernel.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Link: http://lkml.kernel.org/r/1392587568-7325-11-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/include/asm/vdso.h | 6 ++++++
arch/x86/kernel/hpet.c | 5 +++++
arch/x86/kernel/vsyscall_32.c | 4 ++++
arch/x86/vdso/vdso32-setup.c | 6 ------
4 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h
index fe3cef9..6db8b23 100644
--- a/arch/x86/include/asm/vdso.h
+++ b/arch/x86/include/asm/vdso.h
@@ -1,6 +1,12 @@
#ifndef _ASM_X86_VDSO_H
#define _ASM_X86_VDSO_H

+enum {
+ VDSO_DISABLED = 0,
+ VDSO_ENABLED = 1,
+ VDSO_COMPAT = 2,
+};
+
#if defined CONFIG_X86_32 || defined CONFIG_COMPAT

#include <asm/vdso32.h>
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 54263f0..b99544b 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -15,6 +15,7 @@
#include <asm/fixmap.h>
#include <asm/hpet.h>
#include <asm/time.h>
+#include <asm/elf.h>

#define HPET_MASK CLOCKSOURCE_MASK(32)

@@ -74,6 +75,10 @@ static inline void hpet_writel(unsigned int d, unsigned int a)
static inline void hpet_set_mapping(void)
{
hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
+#ifdef CONFIG_X86_32
+ if (vdso_enabled != VDSO_COMPAT)
+ return;
+#endif
__set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VVAR_NOCACHE);
}

diff --git a/arch/x86/kernel/vsyscall_32.c b/arch/x86/kernel/vsyscall_32.c
index 4b94c47..0cbf94b 100644
--- a/arch/x86/kernel/vsyscall_32.c
+++ b/arch/x86/kernel/vsyscall_32.c
@@ -13,8 +13,12 @@
#include <asm/vsyscall.h>
#include <asm/pgtable.h>
#include <asm/fixmap.h>
+#include <asm/elf.h>

void __init map_vsyscall(void)
{
+ if (vdso_enabled != VDSO_COMPAT)
+ return;
+
__set_fixmap(VVAR_PAGE, __pa_symbol(&__vvar_page), PAGE_KERNEL_VVAR);
}
diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c
index 9b57770..6b74a46 100644
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -29,12 +29,6 @@
#include <asm/hpet.h>
#include <asm/vvar.h>

-enum {
- VDSO_DISABLED = 0,
- VDSO_ENABLED = 1,
- VDSO_COMPAT = 2,
-};
-
#ifdef CONFIG_COMPAT_VDSO
#define VDSO_DEFAULT VDSO_COMPAT
#else

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