[xen staging] x86/vPMU: avoid effectively open-coding xzalloc_flex_struct()

[patchbot@xxxxxxx]

commit 463e8e6cf764beda5f58117a422dcb3a06fed405
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Apr 9 09:25:17 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Apr 9 09:25:17 2021 +0200

    x86/vPMU: avoid effectively open-coding xzalloc_flex_struct()
    
    There is a difference in generated code: xzalloc_bytes() forces
    SMP_CACHE_BYTES alignment. I think we not only don't need this here, but
    actually don't want it.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/cpu/vpmu_intel.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/cpu/vpmu_intel.c b/xen/arch/x86/cpu/vpmu_intel.c
index 6e97ce7900..64334c5fab 100644
--- a/xen/arch/x86/cpu/vpmu_intel.c
+++ b/xen/arch/x86/cpu/vpmu_intel.c
@@ -461,10 +461,10 @@ static int core2_vpmu_alloc_resource(struct vcpu *v)
             goto out_err;
     }
 
-    core2_vpmu_cxt = xzalloc_bytes(sizeof(*core2_vpmu_cxt) +
-                                   sizeof(uint64_t) * fixed_pmc_cnt +
-                                   sizeof(struct xen_pmu_cntr_pair) *
-                                   arch_pmc_cnt);
+    core2_vpmu_cxt = xzalloc_flex_struct(struct xen_pmu_intel_ctxt, regs,
+                                         fixed_pmc_cnt + arch_pmc_cnt *
+                                         (sizeof(struct xen_pmu_cntr_pair) /
+                                          sizeof(*core2_vpmu_cxt->regs)));
     p = xzalloc(uint64_t);
     if ( !core2_vpmu_cxt || !p )
         goto out_err;
--
generated by git-patchbot for /home/xen/git/xen.git#staging