[patch V2 3/8] x86/smp: Remove pointless wmb() from native_stop_other_cpus()

[Thomas Gleixner]

The wmb() after the successfull atomic_cmpxchg() is complete voodoo along
with the comment stating "sync above data before sending IRQ".

There is no "above" data except for the atomic_t stopping_cpu which has
just been acquired. The reboot IPI handler does not check any data and
unconditionally disables the CPU.

Remove this cargo cult barrier.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
---
 arch/x86/kernel/smp.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -174,9 +174,6 @@ static void native_stop_other_cpus(int w
 
 		atomic_set(&stop_cpus_count, num_online_cpus() - 1);
 
-		/* sync above data before sending IRQ */
-		wmb();
-
 		apic_send_IPI_allbutself(REBOOT_VECTOR);
 
 		/*