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* [PATCH v23 00/13] x86: Add x86 32 bit VDSO time function support
@ 2014-03-17 22:22 Stefani Seibold
  2014-03-17 22:22 ` [PATCH v23 01/13] x86, vdso: Make vsyscall_gtod_data handling x86 generic Stefani Seibold
                   ` (12 more replies)
  0 siblings, 13 replies; 31+ messages in thread
From: Stefani Seibold @ 2014-03-17 22:22 UTC (permalink / raw)
  To: gregkh, linux-kernel, x86, tglx, mingo, hpa, ak, aarcange,
	john.stultz, luto, xemul, gorcunov, andriy.shevchenko
  Cc: Martin.Runge, Andreas.Brief, Stefani Seibold

This patch add the functions vdso_gettimeofday(), vdso_clock_gettime()
and vdso_time() to the x86 32 bit VDSO.

The reason to do this was to get a fast reliable time stamp. Many developers
uses TSC to get a fast time stamp, without knowing the pitfalls. VDSO
time functions a fast and a reliable way, because the kernel knows the
best time source and the P- and C-state of the CPU.

The helper library to use the VDSO functions can be download at
http://http://seibold.net/vdso.c
The libary is very small, only 228 lines of code. Compile it with
gcc -Wall -O3 -fpic vdso.c -lrt -shared -o libvdso.so
and use it with LD_PRELOAD=<path>/libvdso.so

There is also a patch http://seibold.net/glibc.patch for glibc 2.19 which also
works for glibc 2.18.  This patch must be integrated into glibc.

Some linux 32 bit kernel benchmark results (all measurements are in nano
seconds):

Intel(R) Celeron(TM) CPU 400MHz

Average time kernel call:
 gettimeofday(): 1039
 clock_gettime(): 1578
 time(): 526
Average time VDSO call:
 gettimeofday(): 378
 clock_gettime(): 303
 time(): 60

Celeron(R) Dual-Core CPU T3100 1.90GHz

Average time kernel call:
 gettimeofday(): 209
 clock_gettime(): 406
 time(): 135
Average time VDSO call:
 gettimeofday(): 51
 clock_gettime(): 43
 time(): 10

So you can see a performance increase between 4 and 13, depending on the
CPU and the function.

The IA32 Emulation uses the whole 4 GB address space, so there is no
fixed address available.

The VDSO for a 32 bit application has now three pages:

^ Higher Address
|
+----------------------------------------+
+ VDSO page (includes code) ro+x         +
+----------------------------------------+
+ VVAR page (export kernel variables) ro +
+----------------------------------------+
+ HPET page (mapped registers) ro 
+----------------------------------------+
|
^ Lower Address

The VDSO page for a 32 bit resided still on 0xffffe000, the the VVAR and
HPET page are mapped before.

In the non compat mode the VMA of the VDSO is now 3 pages for a 32 bit kernel.
So this decrease the available logical address room by 2 pages.

The patch is against tip x86/vdso (1f2cbcf648962cdcf511d234cb39745baa9f5d07)

Changelog:
25.11.2012 - first release and proof of concept for linux 3.4
11.12.2012 - Port to linux 3.7 and code cleanup
12.12.2012 - fixes suggested by Andy Lutomirski
           - fixes suggested by John Stultz
           - use call VDSO32_vsyscall instead of int 80
           - code cleanup
17.12.2012 - support for IA32_EMULATION, this includes
             - code cleanup
             - include cleanup to fix compile warnings and errors
             - move out seqcount from seqlock, enable use in VDSO
             - map FIXMAP and HPET into the 32 bit address space
18.12.2012 - split into separate patches
30.01.2014 - revamp the code
             - code clean up
             - VDSO layout changed
             - no fixed addresses
             - port to 3.14
01.02.2014 - code cleanup
02.02.2014 - code cleanup
             - split into more patches
             - use HPET_COUNTER instead of hard coded value
             - fix changelog to the right year ;-)
02.02.2014 - reverse the mapping, this make the new VDSO 32 bit support
             full compatible.
03.02.2014 - code cleanup
             - fix comment
             - fix ABI break in vdso32.lds.S
04.02.2014 - revamp IA32 emulation support
             - introduce VVAR macro
             - rearranged vsyscall_gtod_data struture for IA32 emulation support
             - code cleanup
05.02.2014 - revamp IA32 emulation support
             - replace seqcount_t by an unsigned, to make the vsyscall_gtod_data
               structure independed of kernel config and functions.
08.02.2014 - revamp IA32 emulation support
             - replace all internal structures by fix size elements
10.02.2014 - code cleanup
             - add commets
             - revamp inline assembly
12.02.2014 - add conditional fixmap of vvar and hpet pages for 32 bit kernel
14.02.2014 - fix CONFIG_PARAVIRT_CLOCK, which is not supported in 32 bit VDSO
15.02.2014 - fix tsc
             code cleanup
             tested make ARCH=i386 allyesconfig and make allyesconfig
16.02.2014 - code cleanup
             - fix all C=1 warnings, also some one not introduced by this patch
             - hack to fix C=1 32 bit VDSO spinlock for a 64 bit kernel
             - fix VDSO Makefile for newer gcc
             tested for gcc 4.3.4 and 4.8.1
             tested ARCH=i386 allyesconfig, defconfig and allmodconfig
             tested X86_64 allyesconfig, defconfig and allmodconfig
17.02.2014 - In case of a 32 bit VDSO for a 64 bit kernel fake a 32 bit kernel
             configuration.
19.02.2014 - Add missing #undef and #define to fake proper 32 bit kernel config
             Add a missing #ifdef CONFIG_HPET_TIMER
             tested again ARCH=i386 allyesconfig, defconfig and allmodconfig
             tested again ARCH=X86_64 allyesconfig, defconfig and allmodconfig
02.03.2014 - Add fixes suggested by Andy Lutomirski
             - Patch alternatives in the 32 bit VDSO
	     - Use the default ABI for the 32 bit VDSO
	     - Inline the CLOCK MONOTONIC VDSO code
	     - Zero pad the VVAR page
	     - fix "patch alternatives" compile for 32 bit kernel
03.03.2014 - Add glibc.patch http://seibold.net/glibc.patch
             Add reviewed-by tags
17.03.2014 - Rebase on tip x86/vdso 1f2cbcf648962cdcf511d234cb39745baa9f5d07
             remove fixmap and compat mode dependencies

^ permalink raw reply	[flat|nested] 31+ messages in thread
* [Patch v22 10/12] x86: Add 32 bit VDSO time support for 64 bit kernel
@ 2014-03-03 21:12 Stefani Seibold
  2014-03-05 22:32 ` [tip:x86/vdso] x86, vdso: " tip-bot for Stefani Seibold
  0 siblings, 1 reply; 31+ messages in thread
From: Stefani Seibold @ 2014-03-03 21:12 UTC (permalink / raw)
  To: gregkh, linux-kernel, x86, tglx, mingo, hpa, ak, aarcange,
	john.stultz, luto, xemul, gorcunov, andriy.shevchenko
  Cc: Martin.Runge, Andreas.Brief, Stefani Seibold

This patch add the VDSO time support for the IA32 Emulation Layer.

Due the nature of the kernel headers and the LP64 compiler where the
size of a long and a pointer differs against a 32 bit compiler, there
is some type hacking necessary for optimal performance.

The vsyscall_gtod_data struture must be a rearranged to serve 32- and
64-bit code access at the same time:

- The seqcount_t was replaced by an unsigned, this makes the
  vsyscall_gtod_data intedepend of kernel configuration and internal functions.
- All kernel internal structures are replaced by fix size elements
  which works for 32- and 64-bit access
- The inner struct clock was removed to pack the whole struct.

The "unsigned seq" would be handled by functions derivated from seqcount_t.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
---
 arch/x86/include/asm/vgtod.h          | 71 +++++++++++++++++++++------
 arch/x86/include/asm/vvar.h           |  5 ++
 arch/x86/kernel/vsyscall_gtod.c       | 34 ++++++++-----
 arch/x86/vdso/vclock_gettime.c        | 91 +++++++++++++++++++----------------
 arch/x86/vdso/vdso32/vclock_gettime.c | 21 ++++++++
 5 files changed, 155 insertions(+), 67 deletions(-)

diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index 46e24d3..3c3366c 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -1,30 +1,73 @@
 #ifndef _ASM_X86_VGTOD_H
 #define _ASM_X86_VGTOD_H
 
-#include <asm/vsyscall.h>
+#include <linux/compiler.h>
 #include <linux/clocksource.h>
 
+#ifdef BUILD_VDSO32_64
+typedef u64 gtod_long_t;
+#else
+typedef unsigned long gtod_long_t;
+#endif
+/*
+ * vsyscall_gtod_data will be accessed by 32 and 64 bit code at the same time
+ * so be carefull by modifying this structure.
+ */
 struct vsyscall_gtod_data {
-	seqcount_t	seq;
+	unsigned seq;
 
-	struct { /* extract of a clocksource struct */
-		int vclock_mode;
-		cycle_t	cycle_last;
-		cycle_t	mask;
-		u32	mult;
-		u32	shift;
-	} clock;
+	int vclock_mode;
+	cycle_t	cycle_last;
+	cycle_t	mask;
+	u32	mult;
+	u32	shift;
 
 	/* open coded 'struct timespec' */
-	time_t		wall_time_sec;
 	u64		wall_time_snsec;
+	gtod_long_t	wall_time_sec;
+	gtod_long_t	monotonic_time_sec;
 	u64		monotonic_time_snsec;
-	time_t		monotonic_time_sec;
+	gtod_long_t	wall_time_coarse_sec;
+	gtod_long_t	wall_time_coarse_nsec;
+	gtod_long_t	monotonic_time_coarse_sec;
+	gtod_long_t	monotonic_time_coarse_nsec;
 
-	struct timezone sys_tz;
-	struct timespec wall_time_coarse;
-	struct timespec monotonic_time_coarse;
+	int		tz_minuteswest;
+	int		tz_dsttime;
 };
 extern struct vsyscall_gtod_data vsyscall_gtod_data;
 
+static inline unsigned gtod_read_begin(const struct vsyscall_gtod_data *s)
+{
+	unsigned ret;
+
+repeat:
+	ret = ACCESS_ONCE(s->seq);
+	if (unlikely(ret & 1)) {
+		cpu_relax();
+		goto repeat;
+	}
+	smp_rmb();
+	return ret;
+}
+
+static inline int gtod_read_retry(const struct vsyscall_gtod_data *s,
+					unsigned start)
+{
+	smp_rmb();
+	return unlikely(s->seq != start);
+}
+
+static inline void gtod_write_begin(struct vsyscall_gtod_data *s)
+{
+	++s->seq;
+	smp_wmb();
+}
+
+static inline void gtod_write_end(struct vsyscall_gtod_data *s)
+{
+	smp_wmb();
+	++s->seq;
+}
+
 #endif /* _ASM_X86_VGTOD_H */
diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 52c79ff..081d909 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -16,6 +16,9 @@
  * you mess up, the linker will catch it.)
  */
 
+#ifndef _ASM_X86_VVAR_H
+#define _ASM_X86_VVAR_H
+
 #if defined(__VVAR_KERNEL_LDS)
 
 /* The kernel linker script defines its own magic to put vvars in the
@@ -64,3 +67,5 @@ DECLARE_VVAR(16, int, vgetcpu_mode)
 DECLARE_VVAR(128, struct vsyscall_gtod_data, vsyscall_gtod_data)
 
 #undef DECLARE_VVAR
+
+#endif
diff --git a/arch/x86/kernel/vsyscall_gtod.c b/arch/x86/kernel/vsyscall_gtod.c
index 91862a4..eacd12f 100644
--- a/arch/x86/kernel/vsyscall_gtod.c
+++ b/arch/x86/kernel/vsyscall_gtod.c
@@ -4,6 +4,7 @@
  *
  *  Modified for x86 32 bit architecture by
  *  Stefani Seibold <stefani@seibold.net>
+ *  sponsored by Rohde & Schwarz GmbH & Co. KG Munich/Germany
  *
  *  Thanks to hpa@transmeta.com for some useful hint.
  *  Special thanks to Ingo Molnar for his early experience with
@@ -13,26 +14,28 @@
 
 #include <linux/timekeeper_internal.h>
 #include <asm/vgtod.h>
+#include <asm/vvar.h>
 
 DEFINE_VVAR(struct vsyscall_gtod_data, vsyscall_gtod_data);
 
 void update_vsyscall_tz(void)
 {
-	vsyscall_gtod_data.sys_tz = sys_tz;
+	vsyscall_gtod_data.tz_minuteswest = sys_tz.tz_minuteswest;
+	vsyscall_gtod_data.tz_dsttime = sys_tz.tz_dsttime;
 }
 
 void update_vsyscall(struct timekeeper *tk)
 {
 	struct vsyscall_gtod_data *vdata = &vsyscall_gtod_data;
 
-	write_seqcount_begin(&vdata->seq);
+	gtod_write_begin(vdata);
 
 	/* copy vsyscall data */
-	vdata->clock.vclock_mode	= tk->clock->archdata.vclock_mode;
-	vdata->clock.cycle_last		= tk->clock->cycle_last;
-	vdata->clock.mask		= tk->clock->mask;
-	vdata->clock.mult		= tk->mult;
-	vdata->clock.shift		= tk->shift;
+	vdata->vclock_mode	= tk->clock->archdata.vclock_mode;
+	vdata->cycle_last	= tk->clock->cycle_last;
+	vdata->mask		= tk->clock->mask;
+	vdata->mult		= tk->mult;
+	vdata->shift		= tk->shift;
 
 	vdata->wall_time_sec		= tk->xtime_sec;
 	vdata->wall_time_snsec		= tk->xtime_nsec;
@@ -49,12 +52,19 @@ void update_vsyscall(struct timekeeper *tk)
 		vdata->monotonic_time_sec++;
 	}
 
-	vdata->wall_time_coarse.tv_sec	= tk->xtime_sec;
-	vdata->wall_time_coarse.tv_nsec	= (long)(tk->xtime_nsec >> tk->shift);
+	vdata->wall_time_coarse_sec	= tk->xtime_sec;
+	vdata->wall_time_coarse_nsec	= (long)(tk->xtime_nsec >> tk->shift);
 
-	vdata->monotonic_time_coarse	= timespec_add(vdata->wall_time_coarse,
-							tk->wall_to_monotonic);
+	vdata->monotonic_time_coarse_sec =
+		vdata->wall_time_coarse_sec + tk->wall_to_monotonic.tv_sec;
+	vdata->monotonic_time_coarse_nsec =
+		vdata->wall_time_coarse_nsec + tk->wall_to_monotonic.tv_nsec;
 
-	write_seqcount_end(&vdata->seq);
+	while (vdata->monotonic_time_coarse_nsec >= NSEC_PER_SEC) {
+		vdata->monotonic_time_coarse_nsec -= NSEC_PER_SEC;
+		vdata->monotonic_time_coarse_sec++;
+	}
+
+	gtod_write_end(vdata);
 }
 
diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 90bb5e8..16d6861 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -14,16 +14,14 @@
 /* Disable profiling for userspace code: */
 #define DISABLE_BRANCH_PROFILING
 
-#include <linux/kernel.h>
 #include <uapi/linux/time.h>
-#include <linux/string.h>
-#include <asm/vsyscall.h>
-#include <asm/fixmap.h>
 #include <asm/vgtod.h>
 #include <asm/hpet.h>
+#include <asm/vvar.h>
 #include <asm/unistd.h>
-#include <asm/io.h>
-#include <asm/pvclock.h>
+#include <asm/msr.h>
+#include <linux/math64.h>
+#include <linux/time.h>
 
 #define gtod (&VVAR(vsyscall_gtod_data))
 
@@ -31,11 +29,23 @@ extern int __vdso_clock_gettime(clockid_t clock, struct timespec *ts);
 extern int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
 extern time_t __vdso_time(time_t *t);
 
+#ifdef CONFIG_HPET_TIMER
+static inline u32 read_hpet_counter(const volatile void *addr)
+{
+	return *(const volatile u32 *) (addr + HPET_COUNTER);
+}
+#endif
+
 #ifndef BUILD_VDSO32
 
+#include <linux/kernel.h>
+#include <asm/vsyscall.h>
+#include <asm/fixmap.h>
+#include <asm/pvclock.h>
+
 static notrace cycle_t vread_hpet(void)
 {
-	return readl((const void __iomem *)fix_to_virt(VSYSCALL_HPET) + HPET_COUNTER);
+	return read_hpet_counter((const void *)fix_to_virt(VSYSCALL_HPET));
 }
 
 notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
@@ -116,7 +126,7 @@ static notrace cycle_t vread_pvclock(int *mode)
 		*mode = VCLOCK_NONE;
 
 	/* refer to tsc.c read_tsc() comment for rationale */
-	last = gtod->clock.cycle_last;
+	last = gtod->cycle_last;
 
 	if (likely(ret >= last))
 		return ret;
@@ -133,7 +143,7 @@ extern u8 hpet_page
 #ifdef CONFIG_HPET_TIMER
 static notrace cycle_t vread_hpet(void)
 {
-	return readl((const void __iomem *)(&hpet_page + HPET_COUNTER));
+	return read_hpet_counter((const void *)(&hpet_page));
 }
 #endif
 
@@ -193,7 +203,7 @@ notrace static cycle_t vread_tsc(void)
 	rdtsc_barrier();
 	ret = (cycle_t)__native_read_tsc();
 
-	last = gtod->clock.cycle_last;
+	last = gtod->cycle_last;
 
 	if (likely(ret >= last))
 		return ret;
@@ -214,20 +224,21 @@ notrace static inline u64 vgetsns(int *mode)
 {
 	u64 v;
 	cycles_t cycles;
-	if (gtod->clock.vclock_mode == VCLOCK_TSC)
+
+	if (gtod->vclock_mode == VCLOCK_TSC)
 		cycles = vread_tsc();
 #ifdef CONFIG_HPET_TIMER
-	else if (gtod->clock.vclock_mode == VCLOCK_HPET)
+	else if (gtod->vclock_mode == VCLOCK_HPET)
 		cycles = vread_hpet();
 #endif
 #ifdef CONFIG_PARAVIRT_CLOCK
-	else if (gtod->clock.vclock_mode == VCLOCK_PVCLOCK)
+	else if (gtod->vclock_mode == VCLOCK_PVCLOCK)
 		cycles = vread_pvclock(mode);
 #endif
 	else
 		return 0;
-	v = (cycles - gtod->clock.cycle_last) & gtod->clock.mask;
-	return v * gtod->clock.mult;
+	v = (cycles - gtod->cycle_last) & gtod->mask;
+	return v * gtod->mult;
 }
 
 /* Code size doesn't matter (vdso is 4k anyway) and this is faster. */
@@ -237,17 +248,18 @@ notrace static int __always_inline do_realtime(struct timespec *ts)
 	u64 ns;
 	int mode;
 
-	ts->tv_nsec = 0;
 	do {
-		seq = raw_read_seqcount_begin(&gtod->seq);
-		mode = gtod->clock.vclock_mode;
+		seq = gtod_read_begin(gtod);
+		mode = gtod->vclock_mode;
 		ts->tv_sec = gtod->wall_time_sec;
 		ns = gtod->wall_time_snsec;
 		ns += vgetsns(&mode);
-		ns >>= gtod->clock.shift;
-	} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
+		ns >>= gtod->shift;
+	} while (unlikely(gtod_read_retry(gtod, seq)));
+
+	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
+	ts->tv_nsec = ns;
 
-	timespec_add_ns(ts, ns);
 	return mode;
 }
 
@@ -257,16 +269,17 @@ notrace static int __always_inline do_monotonic(struct timespec *ts)
 	u64 ns;
 	int mode;
 
-	ts->tv_nsec = 0;
 	do {
-		seq = raw_read_seqcount_begin(&gtod->seq);
-		mode = gtod->clock.vclock_mode;
+		seq = gtod_read_begin(gtod);
+		mode = gtod->vclock_mode;
 		ts->tv_sec = gtod->monotonic_time_sec;
 		ns = gtod->monotonic_time_snsec;
 		ns += vgetsns(&mode);
-		ns >>= gtod->clock.shift;
-	} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
-	timespec_add_ns(ts, ns);
+		ns >>= gtod->shift;
+	} while (unlikely(gtod_read_retry(gtod, seq)));
+
+	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
+	ts->tv_nsec = ns;
 
 	return mode;
 }
@@ -275,20 +288,20 @@ notrace static void do_realtime_coarse(struct timespec *ts)
 {
 	unsigned long seq;
 	do {
-		seq = raw_read_seqcount_begin(&gtod->seq);
-		ts->tv_sec = gtod->wall_time_coarse.tv_sec;
-		ts->tv_nsec = gtod->wall_time_coarse.tv_nsec;
-	} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
+		seq = gtod_read_begin(gtod);
+		ts->tv_sec = gtod->wall_time_coarse_sec;
+		ts->tv_nsec = gtod->wall_time_coarse_nsec;
+	} while (unlikely(gtod_read_retry(gtod, seq)));
 }
 
 notrace static void do_monotonic_coarse(struct timespec *ts)
 {
 	unsigned long seq;
 	do {
-		seq = raw_read_seqcount_begin(&gtod->seq);
-		ts->tv_sec = gtod->monotonic_time_coarse.tv_sec;
-		ts->tv_nsec = gtod->monotonic_time_coarse.tv_nsec;
-	} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
+		seq = gtod_read_begin(gtod);
+		ts->tv_sec = gtod->monotonic_time_coarse_sec;
+		ts->tv_nsec = gtod->monotonic_time_coarse_nsec;
+	} while (unlikely(gtod_read_retry(gtod, seq)));
 }
 
 notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
@@ -322,17 +335,13 @@ int clock_gettime(clockid_t, struct timespec *)
 notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
 {
 	if (likely(tv != NULL)) {
-		BUILD_BUG_ON(offsetof(struct timeval, tv_usec) !=
-			     offsetof(struct timespec, tv_nsec) ||
-			     sizeof(*tv) != sizeof(struct timespec));
 		if (unlikely(do_realtime((struct timespec *)tv) == VCLOCK_NONE))
 			return vdso_fallback_gtod(tv, tz);
 		tv->tv_usec /= 1000;
 	}
 	if (unlikely(tz != NULL)) {
-		/* Avoid memcpy. Some old compilers fail to inline it */
-		tz->tz_minuteswest = gtod->sys_tz.tz_minuteswest;
-		tz->tz_dsttime = gtod->sys_tz.tz_dsttime;
+		tz->tz_minuteswest = gtod->tz_minuteswest;
+		tz->tz_dsttime = gtod->tz_dsttime;
 	}
 
 	return 0;
diff --git a/arch/x86/vdso/vdso32/vclock_gettime.c b/arch/x86/vdso/vdso32/vclock_gettime.c
index d9bb9fc..867c21d 100644
--- a/arch/x86/vdso/vdso32/vclock_gettime.c
+++ b/arch/x86/vdso/vdso32/vclock_gettime.c
@@ -1,4 +1,25 @@
 #define BUILD_VDSO32
 
+#ifdef CONFIG_X86_64
+
+/*
+ * in case of a 32 bit VDSO for a 64 bit kernel fake a 32 bit kernel
+ * configuration
+ */
+#undef CONFIG_64BIT
+#undef CONFIG_X86_64
+#undef CONFIG_ILLEGAL_POINTER_VALUE
+#undef CONFIG_SPARSEMEM_VMEMMAP
+#undef CONFIG_NR_CPUS
+
+#define CONFIG_X86_32 1
+#define CONFIG_PAGE_OFFSET 0
+#define CONFIG_ILLEGAL_POINTER_VALUE 0
+#define CONFIG_NR_CPUS 1
+
+#define BUILD_VDSO32_64
+
+#endif
+
 #include "../vclock_gettime.c"
 
-- 
1.9.0


^ permalink raw reply	[flat|nested] 31+ messages in thread
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2014-03-17 22:22 [PATCH v23 00/13] x86: Add x86 32 bit VDSO time function support Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 01/13] x86, vdso: Make vsyscall_gtod_data handling x86 generic Stefani Seibold
2014-03-18 21:27   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 02/13] mm: Add new func _install_special_mapping() to mmap.c Stefani Seibold
2014-03-18 21:28   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 03/13] x86, vdso: Revamp vclock_gettime.c Stefani Seibold
2014-03-18 21:28   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 04/13] x86, vdso: __vdso_clock_gettime() cleanup Stefani Seibold
2014-03-18 21:28   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 05/13] x86, vdso: Replace VVAR(vsyscall_gtod_data) by gtod macro Stefani Seibold
2014-03-18 21:28   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 06/13] x86, vdso: Cleanup __vdso_gettimeofday() Stefani Seibold
2014-03-18 21:28   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 07/13] x86, vdso: Introduce VVAR marco for vdso32 Stefani Seibold
2014-03-18 21:29   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 08/13] x86, vdso: Patch alternatives in the 32-bit VDSO Stefani Seibold
2014-03-18 21:29   ` [tip:x86/vdso] " tip-bot for Andy Lutomirski
2014-03-17 22:22 ` [PATCH v23 09/13] x86, vdso: Add 32 bit VDSO time support for 32 bit kernel Stefani Seibold
2014-03-18 21:29   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-17 22:22 ` [PATCH v23 10/13] x86, vdso: Add 32 bit VDSO time support for 64 " Stefani Seibold
2014-03-18 21:29   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
2014-03-27 20:44   ` [PATCH v23 10/13] " John Stultz
2014-03-27 21:12     ` Andy Lutomirski
2014-03-27 22:35     ` H. Peter Anvin
2014-03-17 22:22 ` [PATCH v23 11/13] x86, vdso: Zero-pad the VVAR page Stefani Seibold
2014-03-18 21:29   ` [tip:x86/vdso] " tip-bot for Andy Lutomirski
2014-03-17 22:22 ` [PATCH v23 12/13] x86, vdso32: Disable stack protector, adjust optimizations Stefani Seibold
2014-03-18 21:29   ` [tip:x86/vdso] " tip-bot for H. Peter Anvin
2014-03-17 22:22 ` [PATCH v23 13/13] x86, vdso32: handle 32 bit vDSO larger one page Stefani Seibold
2014-03-18 21:30   ` [tip:x86/vdso] " tip-bot for Stefani Seibold
  -- strict thread matches above, loose matches on Subject: below --
2014-03-03 21:12 [Patch v22 10/12] x86: Add 32 bit VDSO time support for 64 bit kernel Stefani Seibold
2014-03-05 22:32 ` [tip:x86/vdso] x86, vdso: " tip-bot for Stefani Seibold

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