linux-kernel - [PATCH 1/1] x86/hyperv: Make hv_setup_sched

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Date:   Sun,  9 Aug 2020 18:29:51 -0700
From:   Michael Kelley <mikelley@...rosoft.com>
To:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        peterz@...radead.org, kys@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com, linux-hyperv@...r.kernel.org
Cc:     mikelley@...rosoft.com
Subject: [PATCH 1/1] x86/hyperv: Make hv_setup_sched_clock inline

Make hv_setup_sched_clock inline so the reference to pv_ops works
correctly with objtool updates to detect noinstr violations.
See https://lore.kernel.org/patchwork/patch/1283635/

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/include/asm/mshyperv.h | 12 ++++++++++++
 arch/x86/kernel/cpu/mshyperv.c  |  7 -------
 include/asm-generic/mshyperv.h  |  1 -
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 60b944d..4f77b8f 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -8,6 +8,7 @@
 #include <asm/io.h>
 #include <asm/hyperv-tlfs.h>
 #include <asm/nospec-branch.h>
+#include <asm/paravirt.h>
 
 typedef int (*hyperv_fill_flush_list_func)(
 		struct hv_guest_mapping_flush_list *flush,
@@ -54,6 +55,17 @@ typedef int (*hyperv_fill_flush_list_func)(
 	vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
 #define hv_get_raw_timer() rdtsc_ordered()
 
+/*
+ * Reference to pv_ops must be inline so objtool
+ * detection of noinstr violations can work correctly.
+ */
+static __always_inline void hv_setup_sched_clock(void *sched_clock)
+{
+#ifdef CONFIG_PARAVIRT
+	pv_ops.time.sched_clock = sched_clock;
+#endif
+}
+
 void hyperv_vector_handler(struct pt_regs *regs);
 
 static inline void hv_enable_stimer0_percpu_irq(int irq) {}
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index af94f05..3112544 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -361,13 +361,6 @@ static void __init ms_hyperv_init_platform(void)
 #endif
 }
 
-void hv_setup_sched_clock(void *sched_clock)
-{
-#ifdef CONFIG_PARAVIRT
-	pv_ops.time.sched_clock = sched_clock;
-#endif
-}
-
 const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
 	.name			= "Microsoft Hyper-V",
 	.detect			= ms_hyperv_platform,
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 1c4fd95..c5edc5e 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -168,7 +168,6 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
 bool hv_is_hyperv_initialized(void);
 bool hv_is_hibernation_supported(void);
 void hyperv_cleanup(void);
-void hv_setup_sched_clock(void *sched_clock);
 #else /* CONFIG_HYPERV */
 static inline bool hv_is_hyperv_initialized(void) { return false; }
 static inline bool hv_is_hibernation_supported(void) { return false; }
-- 
1.8.3.1