linux-kernel - [tip: timers/core] clocksource/drivers/hyper-v: Include asm/hyperv-tlfs.h not asm/mshyperv.h

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Date:   Thu, 17 Nov 2022 10:48:31 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Michael Kelley <mikelley@...rosoft.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: timers/core] clocksource/drivers/hyper-v: Include
 asm/hyperv-tlfs.h not asm/mshyperv.h

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     d3fe5c2f206148f86f85f56671109a3118bf0d2b
Gitweb:        https://git.kernel.org/tip/d3fe5c2f206148f86f85f56671109a3118bf0d2b
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sun, 13 Nov 2022 22:21:15 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 17 Nov 2022 11:41:19 +01:00

clocksource/drivers/hyper-v: Include asm/hyperv-tlfs.h not asm/mshyperv.h

clocksource/hyperv_timer.h is included into the VDSO build. It includes
asm/mshyperv.h which in turn includes the world and some more. This worked
so far by chance, but any subtle change in the include chain results in a
build breakage because VDSO builds are building user space libraries.

Include asm/hyperv-tlfs.h instead which contains everything what the VDSO
build needs except the hv_get_raw_timer() define. Move this define into a
separate header file, which contains the prerequisites (msr.h) and is
included by clocksource/hyperv_timer.h.

Fixup drivers/hv/vmbus_drv.c which relies on the indirect include of
asm/mshyperv.h.

With that the VDSO build only pulls in the minimum requirements.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
Link: https://lore.kernel.org/r/87fsemtut0.ffs@tglx

---
 arch/x86/include/asm/hyperv_timer.h |  9 +++++++++
 arch/x86/include/asm/mshyperv.h     |  2 --
 drivers/hv/vmbus_drv.c              |  1 +
 include/clocksource/hyperv_timer.h  |  4 +++-
 4 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 arch/x86/include/asm/hyperv_timer.h

diff --git a/arch/x86/include/asm/hyperv_timer.h b/arch/x86/include/asm/hyperv_timer.h
new file mode 100644
index 0000000..388fa81
--- /dev/null
+++ b/arch/x86/include/asm/hyperv_timer.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_HYPERV_TIMER_H
+#define _ASM_X86_HYPERV_TIMER_H
+
+#include <asm/msr.h>
+
+#define hv_get_raw_timer() rdtsc_ordered()
+
+#endif
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 61f0c20..6d502f3 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -19,8 +19,6 @@ typedef int (*hyperv_fill_flush_list_func)(
 		struct hv_guest_mapping_flush_list *flush,
 		void *data);
 
-#define hv_get_raw_timer() rdtsc_ordered()
-
 void hyperv_vector_handler(struct pt_regs *regs);
 
 #if IS_ENABLED(CONFIG_HYPERV)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 8b2e413..1f5d37a 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -37,6 +37,7 @@
 #include <linux/dma-map-ops.h>
 #include <linux/pci.h>
 #include <clocksource/hyperv_timer.h>
+#include <asm/mshyperv.h>
 #include "hyperv_vmbus.h"
 
 struct vmbus_dynid {
diff --git a/include/clocksource/hyperv_timer.h b/include/clocksource/hyperv_timer.h
index b3f5d73..b4a3935 100644
--- a/include/clocksource/hyperv_timer.h
+++ b/include/clocksource/hyperv_timer.h
@@ -15,13 +15,15 @@
 
 #include <linux/clocksource.h>
 #include <linux/math64.h>
-#include <asm/mshyperv.h>
+#include <asm/hyperv-tlfs.h>
 
 #define HV_MAX_MAX_DELTA_TICKS 0xffffffff
 #define HV_MIN_DELTA_TICKS 1
 
 #ifdef CONFIG_HYPERV_TIMER
 
+#include <asm/hyperv_timer.h>
+
 /* Routines called by the VMbus driver */
 extern int hv_stimer_alloc(bool have_percpu_irqs);
 extern int hv_stimer_cleanup(unsigned int cpu);