[Xen-changelog] [xen staging] x86/hyperv: change hv_tlb_flush_ex to fix clang build

[patchbot@xxxxxxx]

commit 17f53645b20a17792eacc364dd007ce60c94a5d1
Author:     Wei Liu <wl@xxxxxxx>
AuthorDate: Mon Dec 23 11:03:30 2019 +0000
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Mon Dec 23 12:21:01 2019 +0000

    x86/hyperv: change hv_tlb_flush_ex to fix clang build
    
    Clang complains:
    
    In file included from synic.c:15:
    /builds/xen-project/xen/xen/include/asm/guest/hyperv-tlfs.h:900:18: error: 
field 'hv_vp_set' with variable sized type 'struct hv_vpset' not at the end of 
a struct or class is a GNU extension 
[-Werror,-Wgnu-variable-sized-type-not-at-end]
            struct hv_vpset hv_vp_set;
                            ^
    1 error generated.
    /builds/xen-project/xen/xen/Rules.mk:198: recipe for target 'synic.o' failed
    make[6]: *** [synic.o] Error 1
    
    Comment out the last variable size array from hv_tlb_flush_ex to fix
    clang builds.
    
    Fixes: bbba482664 ("x86: import hyperv-tlfs.h from Linux")
    Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/asm-x86/guest/hyperv-tlfs.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/include/asm-x86/guest/hyperv-tlfs.h 
b/xen/include/asm-x86/guest/hyperv-tlfs.h
index fe9fb232d0..5b43f99de8 100644
--- a/xen/include/asm-x86/guest/hyperv-tlfs.h
+++ b/xen/include/asm-x86/guest/hyperv-tlfs.h
@@ -908,12 +908,12 @@ struct hv_tlb_flush {
        u64 gva_list[];
 } __packed;
 
-/* HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressListEx hypercalls */
+/* HvFlushVirtualAddressSpaceEx hypercall */
 struct hv_tlb_flush_ex {
        u64 address_space;
        u64 flags;
        struct hv_vpset hv_vp_set;
-       u64 gva_list[];
+       /* u64 gva_list[]; */
 } __packed;
 
 struct hv_partition_assist_pg {
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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