[PATCH v3 07/11] x86/msr: Don't use rdmsr_safe_on_cpu() in rdmsrq_safe_on_cpu()

[Juergen Gross]

In order to prepare removal of rdmsr_safe_on_cpu(), don't use it in
rdmsrq_safe_on_cpu(), but replace it with open coding it.

This will create a nearly verbatim copy of the same code, but this is
only temporary until rdmsr_safe_on_cpu() is removed.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V3:
- patch carved out from other one (Ingo Molnar)
---
 arch/x86/lib/msr-smp.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/x86/lib/msr-smp.c b/arch/x86/lib/msr-smp.c
index a434c80408a0..f3c75b681603 100644
--- a/arch/x86/lib/msr-smp.c
+++ b/arch/x86/lib/msr-smp.c
@@ -190,11 +190,22 @@ EXPORT_SYMBOL(wrmsrq_safe_on_cpu);
 
 int rdmsrq_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
 {
-	u32 low, high;
+	struct msr_info_completion rv;
+	call_single_data_t csd;
 	int err;
 
-	err = rdmsr_safe_on_cpu(cpu, msr_no, &low, &high);
-	*q = (u64)high << 32 | low;
+	INIT_CSD(&csd, __rdmsr_safe_on_cpu, &rv);
+
+	memset(&rv, 0, sizeof(rv));
+	init_completion(&rv.done);
+	rv.msr.msr_no = msr_no;
+
+	err = smp_call_function_single_async(cpu, &csd);
+	if (!err) {
+		wait_for_completion(&rv.done);
+		err = rv.msr.err;
+	}
+	*q = rv.msr.reg.q;
 
 	return err;
 }
-- 
2.54.0