[xen staging] x86/MCE-telem: drop unnecessary per-CPU field

[patchbot@xxxxxxx]

commit e365749ebad539424afa4a7de06961b8cc87335c
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Feb 26 12:23:49 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Feb 26 12:23:49 2025 +0100

    x86/MCE-telem: drop unnecessary per-CPU field
    
    struct mc_telem_cpu_ctl's processing field is used solely in
    mctelem_process_deferred(), where the local variable can as well be used
    directly when retrieving the head of the list to process. This then also
    eliminates the field holding a dangling pointer once the processing of
    the list finished, in particular when the entry is handed to
    mctelem_dismiss().
    
    No functional change intended.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/cpu/mcheck/mctelem.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/xen/arch/x86/cpu/mcheck/mctelem.c 
b/xen/arch/x86/cpu/mcheck/mctelem.c
index ddd4c4cb7b..94e22b6a26 100644
--- a/xen/arch/x86/cpu/mcheck/mctelem.c
+++ b/xen/arch/x86/cpu/mcheck/mctelem.c
@@ -122,7 +122,6 @@ struct mc_telem_cpu_ctl {
         * to guarantee the above mutual exclusivity.
         */
        struct mctelem_ent *pending, *lmce_pending;
-       struct mctelem_ent *processing;
 };
 static DEFINE_PER_CPU(struct mc_telem_cpu_ctl, mctctl);
 
@@ -233,9 +232,7 @@ void mctelem_process_deferred(unsigned int cpu,
         * handled by another round of MCE softirq.
         */
        mctelem_xchg_head(lmce ? &ctl->lmce_pending : &ctl->pending,
-                         &this_cpu(mctctl.processing), NULL);
-
-       head = this_cpu(mctctl.processing);
+                         &head, NULL);
 
        /*
         * Then, fix up the list to include prev pointers, to make
--
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