x86/mce/threshold: Remove the redundant this_cpu_dec_return()

JIRA: https://issues.redhat.com/browse/RHEL-118444

commit 64a668f
Author: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Date:   Thu Dec 12 22:00:58 2024 +0800

    x86/mce/threshold: Remove the redundant this_cpu_dec_return()

    The 'storm' variable points to this_cpu_ptr(&storm_desc). Access the
    'stormy_bank_count' field through the 'storm' to avoid calling
    this_cpu_*() on the same per-CPU variable twice.

    This minor optimization reduces the text size by 16 bytes.

      $ size threshold.o.*
         text	   data	    bss	    dec	    hex	filename
         1395	   1664	      0	   3059	    bf3	threshold.o.old
         1379	   1664	      0	   3043	    be3	threshold.o.new

    No functional changes intended.

    Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
    Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
    Reviewed-by: Tony Luck <tony.luck@intel.com>
    Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
    Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
    Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
    Link: https://lore.kernel.org/r/20241212140103.66964-3-qiuxu.zhuo@intel.com

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

arch/x86/kernel/cpu/mce/threshold.c

@@ -90,7 +90,7 @@ void cmci_storm_end(unsigned int bank)
 	storm->banks[bank].in_storm_mode = false;
 
 	/* If no banks left in storm mode, stop polling. */
-	if (!this_cpu_dec_return(storm_desc.stormy_bank_count))
+	if (!--storm->stormy_bank_count)
 		mce_timer_kick(false);
 }