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Subject[PATCH 08/12] x86: create specific X86_VSYSCALL config variable
Date
vsyscalls are only implemented on 64-bit at present, though there's no
fundimental reason why they couldn't be implemented for 32-bit. Create
a new CONFIG_X86_VSYSCALL to control compilation of vsyscall-related
code and definitions to make it clearer where they are.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Ingo Molnar <mingo@elte.hu>
---
arch/x86/Kconfig | 6 +++++-
arch/x86/include/asm/fixmap.h | 7 +++++--
arch/x86/kernel/Makefile | 3 ++-
arch/x86/kernel/hpet.c | 4 ++--
arch/x86/kernel/tsc.c | 4 ++--
5 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 13ffa5d..7950d54 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -136,7 +136,7 @@ config GENERIC_CALIBRATE_DELAY

config GENERIC_TIME_VSYSCALL
bool
- default X86_64
+ default X86_VSYSCALL

config ARCH_HAS_CPU_RELAX
def_bool y
@@ -222,6 +222,10 @@ config X86_32_LAZY_GS
def_bool y
depends on X86_32 && !CC_STACKPROTECTOR

+config X86_VSYSCALL
+ def_bool y
+ depends on X86_64
+
config KTIME_SCALAR
def_bool X86_32
source "init/Kconfig"
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 7b2d71d..3b63b57 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -74,12 +74,15 @@ enum fixed_addresses {
#ifdef CONFIG_X86_32
FIX_HOLE,
FIX_VDSO,
-#else
+#endif
+
+#ifdef CONFIG_X86_VSYSCALL
VSYSCALL_LAST_PAGE,
VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
+ ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
VSYSCALL_HPET,
-#endif
+#endif /* CONFIG_X86_VSYSCALL */
+
FIX_DBGP_BASE,
FIX_EARLYCON_MEM_BASE,
#ifdef CONFIG_X86_LOCAL_APIC
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 430d5b2..1c9ec2f 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -37,7 +37,8 @@ obj-$(CONFIG_X86_VISWS) += visws_quirks.o
obj-$(CONFIG_X86_32) += probe_roms_32.o
obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o
obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
-obj-$(CONFIG_X86_64) += syscall_64.o vsyscall_64.o
+obj-$(CONFIG_X86_64) += syscall_64.o
+obj-$(CONFIG_X86_VSYSCALL) += vsyscall_64.o
obj-y += bootflag.o e820.o
obj-y += pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
obj-y += alternative.o i8253.o pci-nommu.o
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index dedc2bd..2cac930 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -744,7 +744,7 @@ static cycle_t read_hpet(struct clocksource *cs)
return (cycle_t)hpet_readl(HPET_COUNTER);
}

-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_VSYSCALL
static cycle_t __vsyscall_fn vread_hpet(void)
{
return readl((const void __iomem *)fix_to_virt(VSYSCALL_HPET) + 0xf0);
@@ -759,7 +759,7 @@ static struct clocksource clocksource_hpet = {
.shift = HPET_SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.resume = hpet_resume_counter,
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_VSYSCALL
.vread = vread_hpet,
#endif
};
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 71f4368..fe7174f 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -725,7 +725,7 @@ static cycle_t read_tsc(struct clocksource *cs)
ret : clocksource_tsc.cycle_last;
}

-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_VSYSCALL
static cycle_t __vsyscall_fn vread_tsc(void)
{
cycle_t ret;
@@ -752,7 +752,7 @@ static struct clocksource clocksource_tsc = {
.shift = 22,
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
CLOCK_SOURCE_MUST_VERIFY,
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_VSYSCALL
.vread = vread_tsc,
#endif
};
--
1.6.2.5


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