arch/tile: remove bogus performance optimization
Chris Metcalf [Fri, 30 Mar 2012 20:27:20 +0000 (16:27 -0400)]
We were re-homing the initial task's kernel stack on the boot cpu,
but in fact it's better to let it stay globally homed, since that
task isn't bound to the boot cpu anyway.  This is more of a general
cleanup than an actual performance optimization, but it removes
code, which is a good thing. :-)

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/mm/init.c

index 8400d3f..6a9d20d 100644 (file)
@@ -254,11 +254,6 @@ static pgprot_t __init init_pgprot(ulong address)
                return construct_pgprot(PAGE_KERNEL_RO, PAGE_HOME_IMMUTABLE);
        }
 
-       /* As a performance optimization, keep the boot init stack here. */
-       if (address >= (ulong)&init_thread_union &&
-           address < (ulong)&init_thread_union + THREAD_SIZE)
-               return construct_pgprot(PAGE_KERNEL, smp_processor_id());
-
 #ifndef __tilegx__
 #if !ATOMIC_LOCKS_FOUND_VIA_TABLE()
        /* Force the atomic_locks[] array page to be hash-for-home. */