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[PATCH] x86: restore semicolon after explicit DS prefix
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 8 Oct 2024 18:00:29 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 08 Oct 2024 16:00:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
It's not unnecessary (as the earlier commit claimed): The integrated
assembler of Clang up to 11 complains about an "invalid operand for
instruction".
Fixes: b42cf31d1165 ("x86: use alternative_input() in cache_flush()")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/flushtlb.c
+++ b/xen/arch/x86/flushtlb.c
@@ -286,7 +286,7 @@ void cache_flush(const void *addr, unsig
* + prefix than a clflush + nop, and hence the prefix is added instead
* of letting the alternative framework fill the gap by appending nops.
*/
- alternative_input("ds clflush %[p]",
+ alternative_input("ds; clflush %[p]",
"data16 clflush %[p]", /* clflushopt */
X86_FEATURE_CLFLUSHOPT,
[p] "m" (*(const char *)(addr)));
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