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Re: [PATCH] x86/mce: Compile do_mca() for CONFIG_PV only
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 19 Nov 2024 15:34:16 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "consulting @ bugseng . com" <consulting@xxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 19 Nov 2024 14:34:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.11.2024 13:59, Andrew Cooper wrote:
> Eclair reports a Misra Rule 8.4 violation; that do_mca() can't see it's
> declaration. It turns out that this is a consequence of do_mca() being
> PV-only, and the declaration being compiled out in !PV builds.
>
> Therefore, arrange for do_mca() to be compiled out in !PV builds. This in
> turn requires a number of static functions to become static inline.
Which generally we advocate against. The #ifdef variant you pointed at on
Matrix wasn't all that bad. Plus ...
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: consulting@xxxxxxxxxxx <consulting@xxxxxxxxxxx>
>
> Bloat-o-meter on a !PV build reports:
>
> add/remove: 0/6 grow/shrink: 0/0 up/down: 0/-3717 (-3717)
> Function old new delta
> x86_mc_mceinject 31 - -31
> do_mca.cold 117 - -117
> x86_mc_msrinject 147 - -147
> x86_mc_msrinject.cold 230 - -230
> do_mc_get_cpu_info 500 - -500
> do_mca 2692 - -2692
... what's the effect of the addition of "inline" on a PV=y build? By
using the keyword, we may end up talking the compiler into inlining of
code that better wouldn't be inlined.
Jan
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