[PATCH] Partial revert of "x86/MCE: optional build of AMD/Intel MCE code"

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

{cmci,lmce}_support are written during S3 resume, so cannot live in
__ro_after_init.  Move them back to being __read_mostly, as they were
originally.

Link: https://gitlab.com/xen-project/xen/-/jobs/6966698361
Fixes: 19b6e9f9149f ("x86/MCE: optional build of AMD/Intel MCE code")
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>

We're past feature freeze and this was a silent change in a patch, which was
also untested.  A 30s look at mcheck_init() shows clearly that it's not a 30s
job to fix.
---
 xen/arch/x86/cpu/mcheck/mce.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c
index 1664ca6412ac..32c1b2756b90 100644
--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -38,10 +38,10 @@ DEFINE_PER_CPU_READ_MOSTLY(unsigned int, nr_mce_banks);
 unsigned int __read_mostly firstbank;
 unsigned int __read_mostly ppin_msr;
 uint8_t __read_mostly cmci_apic_vector;
-bool __ro_after_init cmci_support;
+bool __read_mostly cmci_support;
 
 /* If mce_force_broadcast == 1, lmce_support will be disabled forcibly. */
-bool __ro_after_init lmce_support;
+bool __read_mostly lmce_support;
 
 DEFINE_PER_CPU_READ_MOSTLY(struct mca_banks *, poll_bankmask);
 DEFINE_PER_CPU_READ_MOSTLY(struct mca_banks *, no_cmci_banks);

base-commit: 0840bc5ea114f536a4bdfb2ca095b79f2069aae6
-- 
2.30.2