[xen staging] x86: use alternative_input() in cache_flush()

[patchbot@xxxxxxx]

commit b42cf31d1165f06032f205a2bd71f5d099ea2218
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 1 09:47:05 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 1 09:47:05 2024 +0200

    x86: use alternative_input() in cache_flush()
    
    There's no point using alternative_io() when there are no outputs. While
    there drop the unnecessary semicolon after "ds".
    
    No functional change.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/flushtlb.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/flushtlb.c b/xen/arch/x86/flushtlb.c
index 18748b2bc8..2a70c5151b 100644
--- a/xen/arch/x86/flushtlb.c
+++ b/xen/arch/x86/flushtlb.c
@@ -286,11 +286,10 @@ void cache_flush(const void *addr, unsigned int size)
          * + prefix than a clflush + nop, and hence the prefix is added instead
          * of letting the alternative framework fill the gap by appending nops.
          */
-        alternative_io("ds; clflush %[p]",
-                       "data16 clflush %[p]", /* clflushopt */
-                       X86_FEATURE_CLFLUSHOPT,
-                       /* no outputs */,
-                       [p] "m" (*(const char *)(addr)));
+        alternative_input("ds clflush %[p]",
+                          "data16 clflush %[p]", /* clflushopt */
+                           X86_FEATURE_CLFLUSHOPT,
+                           [p] "m" (*(const char *)(addr)));
     }
 
     alternative_2("",
--
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