When we build the compat vdso, the kernel headers will be used
with a 32-bit compiler combined with configuration options
for the 64-bit kernel, which leads to many undesired effects
from header files that make assumptions about the configuration
options, such as:
In file included from include/linux/mm_types.h:15,
from include/asm-generic/fixmap.h:19,
from arch/x86/include/asm/fixmap.h:193,
from arch/x86/include/asm/apic.h:10,
from arch/x86/include/asm/smp.h:13,
from include/linux/smp.h:68,
from include/linux/percpu.h:7,
from include/linux/hrtimer.h:19,
from arch/x86/entry/vdso/vdso32/../../../../../lib/vdso/gettimeofday.c:9,
from arch/x86/entry/vdso/vdso32/../vclock_gettime.c:13,
from arch/x86/entry/vdso/vdso32/vclock_gettime.c:31:
include/linux/page-flags-layout.h:95:2: error: #warning "KASAN: not enough bits in page flags for tag" [-Werror=cpp]
#warning "KASAN: not enough bits in page flags for tag"
^~~~~~~
Limit the scope of the headers much more, by removing linux/hrtimer.h
and asm/mshyperv.h from the list of included files. Instead, the parts
we actually need are moved into separate headers that are included
by the normal ones.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/x86/include/asm/mshyperv-tsc.h | 76 ++++++++++++++++++++++++
arch/x86/include/asm/mshyperv.h | 70 +---------------------
arch/x86/include/asm/pvclock.h | 2 +-
arch/x86/include/asm/vdso/gettimeofday.h | 2 +-
arch/x86/include/asm/vgtod.h | 2 +-
arch/x86/kernel/pvclock.c | 1 +
include/linux/hrtimer.h | 15 +----
include/linux/hrtimer_defs.h | 25 ++++++++
lib/vdso/gettimeofday.c | 3 +-
9 files changed, 109 insertions(+), 87 deletions(-)
create mode 100644 arch/x86/include/asm/mshyperv-tsc.h
create mode 100644 include/linux/hrtimer_defs.h
diff --git a/arch/x86/include/asm/mshyperv-tsc.h b/arch/x86/include/asm/mshyperv-tsc.h
new file mode 100644
index 000000000000..99c98ccea0bf
--- /dev/null
+++ b/arch/x86/include/asm/mshyperv-tsc.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_MSHYPER_TSCPAGE_H
+#define _ASM_X86_MSHYPER_TSCPAGE_H
+
+#include <asm/hyperv-tlfs.h>
+
+#ifdef CONFIG_HYPERV_TSCPAGE
+struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
+static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
+ u64 *cur_tsc)
+{
+ u64 scale, offset;
+ u32 sequence;
+
+ /*
+ * The protocol for reading Hyper-V TSC page is specified in Hypervisor
+ * Top-Level Functional Specification ver. 3.0 and above. To get the
+ * reference time we must do the following:
+ * - READ ReferenceTscSequence
+ * A special '0' value indicates the time source is unreliable and we
+ * need to use something else. The currently published specification
+ * versions (up to 4.0b) contain a mistake and wrongly claim '-1'
+ * instead of '0' as the special value, see commit c35b82ef0294.
+ * - ReferenceTime =
+ * ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
+ * - READ ReferenceTscSequence again. In case its value has changed
+ * since our first reading we need to discard ReferenceTime and repeat
+ * the whole sequence as the hypervisor was updating the page in
+ * between.
+ */
+ do {
+ sequence = READ_ONCE(tsc_pg->tsc_sequence);
+ if (!sequence)
+ return U64_MAX;
+ /*
+ * Make sure we read sequence before we read other values from
+ * TSC page.
+ */
+ smp_rmb();
+
+ scale = READ_ONCE(tsc_pg->tsc_scale);
+ offset = READ_ONCE(tsc_pg->tsc_offset);
+ *cur_tsc = rdtsc_ordered();
+
+ /*
+ * Make sure we read sequence after we read all other values
+ * from TSC page.
+ */
+ smp_rmb();
+
+ } while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
+
+ return mul_u64_u64_shr(*cur_tsc, scale, 64) + offset;
+}
+
+static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
+{
+ u64 cur_tsc;
+
+ return hv_read_tsc_page_tsc(tsc_pg, &cur_tsc);
+}
+
+#else
+static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
+{
+ return NULL;
+}
+
+static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
+ u64 *cur_tsc)
+{
+ BUG();
+ return U64_MAX;
+}
+#endif
+#endif
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index cc60e617931c..db095a992f3e 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -7,6 +7,7 @@
#include <linux/nmi.h>
#include <asm/io.h>
#include <asm/hyperv-tlfs.h>
+#include <asm/mshyperv-tsc.h>
#include <asm/nospec-branch.h>
#define VP_INVAL U32_MAX
@@ -387,73 +388,4 @@ static inline int hyperv_flush_guest_mapping_range(u64 as,
}
#endif /* CONFIG_HYPERV */
-#ifdef CONFIG_HYPERV_TSCPAGE
-struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
-static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
- u64 *cur_tsc)
-{
- u64 scale, offset;
- u32 sequence;
-
- /*
- * The protocol for reading Hyper-V TSC page is specified in Hypervisor
- * Top-Level Functional Specification ver. 3.0 and above. To get the
- * reference time we must do the following:
- * - READ ReferenceTscSequence
- * A special '0' value indicates the time source is unreliable and we
- * need to use something else. The currently published specification
- * versions (up to 4.0b) contain a mistake and wrongly claim '-1'
- * instead of '0' as the special value, see commit c35b82ef0294.
- * - ReferenceTime =
- * ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
- * - READ ReferenceTscSequence again. In case its value has changed
- * since our first reading we need to discard ReferenceTime and repeat
- * the whole sequence as the hypervisor was updating the page in
- * between.
- */
- do {
- sequence = READ_ONCE(tsc_pg->tsc_sequence);
- if (!sequence)
- return U64_MAX;
- /*
- * Make sure we read sequence before we read other values from
- * TSC page.
- */
- smp_rmb();
-
- scale = READ_ONCE(tsc_pg->tsc_scale);
- offset = READ_ONCE(tsc_pg->tsc_offset);
- *cur_tsc = rdtsc_ordered();
-
- /*
- * Make sure we read sequence after we read all other values
- * from TSC page.
- */
- smp_rmb();
-
- } while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
-
- return mul_u64_u64_shr(*cur_tsc, scale, 64) + offset;
-}
-
-static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
-{
- u64 cur_tsc;
-
- return hv_read_tsc_page_tsc(tsc_pg, &cur_tsc);
-}
-
-#else
-static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
-{
- return NULL;
-}
-
-static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
- u64 *cur_tsc)
-{
- BUG();
- return U64_MAX;
-}
-#endif
#endif
diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h
index b6033680d458..19b695ff2c68 100644
--- a/arch/x86/include/asm/pvclock.h
+++ b/arch/x86/include/asm/pvclock.h
@@ -2,7 +2,7 @@
#ifndef _ASM_X86_PVCLOCK_H
#define _ASM_X86_PVCLOCK_H
-#include <linux/clocksource.h>
+#include <asm/clocksource.h>
#include <asm/pvclock-abi.h>
/* some helper functions for xen and kvm pv clock sources */
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h
index 510a0ebd5748..6b2d6ce26bcc 100644
--- a/arch/x86/include/asm/vdso/gettimeofday.h
+++ b/arch/x86/include/asm/vdso/gettimeofday.h
@@ -18,7 +18,7 @@
#include <asm/unistd.h>
#include <asm/msr.h>
#include <asm/pvclock.h>
-#include <asm/mshyperv.h>
+#include <asm/mshyperv-tsc.h>
#define _vdso_data (&VVAR(vdso_data))
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index 0b4e343c62be..cd60f292c553 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -3,7 +3,7 @@
#define _ASM_X86_VGTOD_H
#include <linux/compiler.h>
-#include <linux/clocksource.h>
+#include <asm/clocksource.h>
#include <vdso/datapage.h>
#include <vdso/helpers.h>
diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c
index 9b158b4716d2..747264182df7 100644
--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c
@@ -15,6 +15,7 @@
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/clocksource.h>
#include <linux/kernel.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 2e8957eac4d4..c922ce02e2e6 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -12,6 +12,7 @@
#ifndef _LINUX_HRTIMER_H
#define _LINUX_HRTIMER_H
+#include <linux/hrtimer_defs.h>
#include <linux/rbtree.h>
#include <linux/ktime.h>
#include <linux/init.h>
@@ -298,26 +299,12 @@ struct clock_event_device;
extern void hrtimer_interrupt(struct clock_event_device *dev);
-/*
- * The resolution of the clocks. The resolution value is returned in
- * the clock_getres() system call to give application programmers an
- * idea of the (in)accuracy of timers. Timer values are rounded up to
- * this resolution values.
- */
-# define HIGH_RES_NSEC 1
-# define KTIME_HIGH_RES (HIGH_RES_NSEC)
-# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
-# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
-
extern void clock_was_set_delayed(void);
extern unsigned int hrtimer_resolution;
#else
-# define MONOTONIC_RES_NSEC LOW_RES_NSEC
-# define KTIME_MONOTONIC_RES KTIME_LOW_RES
-
#define hrtimer_resolution (unsigned int)LOW_RES_NSEC
static inline void clock_was_set_delayed(void) { }
diff --git a/include/linux/hrtimer_defs.h b/include/linux/hrtimer_defs.h
new file mode 100644
index 000000000000..1f181d31e29c
--- /dev/null
+++ b/include/linux/hrtimer_defs.h
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef _LINUX_HRTIMER_DEFS_H
+#define _LINUX_HRTIMER_DEFS_H
+
+#ifdef CONFIG_HIGH_RES_TIMERS
+
+/*
+ * The resolution of the clocks. The resolution value is returned in
+ * the clock_getres() system call to give application programmers an
+ * idea of the (in)accuracy of timers. Timer values are rounded up to
+ * this resolution values.
+ */
+# define HIGH_RES_NSEC 1
+# define KTIME_HIGH_RES (HIGH_RES_NSEC)
+# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
+# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
+
+#else
+
+# define MONOTONIC_RES_NSEC LOW_RES_NSEC
+# define KTIME_MONOTONIC_RES KTIME_LOW_RES
+
+#endif
+
+#endif
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index f10e3703abaa..9b4944d2c2ed 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -6,7 +6,8 @@
#include <linux/math64.h>
#include <linux/time.h>
#include <linux/kernel.h>
-#include <linux/hrtimer.h>
+#include <linux/ktime.h>
+#include <linux/hrtimer_defs.h>
#include <vdso/datapage.h>
#include <vdso/helpers.h>
--
2.20.0
