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Re: [PATCH v2] x86: guard synthetic feature and bug enumerators
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Thu, 8 Jan 2026 12:18:32 -0500
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 08 Jan 2026 17:18:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2026-01-07 09:11, Jan Beulich wrote:
While adding new enumerators one may overlook the (rare) need to bump
X86_NR_{SYNTH,BUG}. Guard against that happening by adding respective
checking. The use of BUILD_BUG_ON_ZERO(), however, entails a number of
other changes, as the expansion may not appear in the assembly produced.
Furthermore inputs to file-scope asm() are only supported in gcc15 (or
newer).
No difference in generated code (debug info, however, grows quite a bit).
An implication from the changes is that users of the alternatives patching
macros may not use unnamed asm() input operands anymore, as the "injected"
new operands would break numbering expectations.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
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