typo fixes: mecanism -> mechanism

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 8c28eb0..a820b77 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -988,7 +988,7 @@
 }
 
 /*
- * Initialize memory allocation mecanism, parse "memory" nodes and
+ * Initialize memory allocation mechanism, parse "memory" nodes and
  * obtain that way the top of memory and RMO to setup out local allocator
  */
 static void __init prom_init_mem(void)
diff --git a/arch/powerpc/platforms/powermac/cpufreq_32.c b/arch/powerpc/platforms/powermac/cpufreq_32.c
index af2a8f9..7adb384 100644
--- a/arch/powerpc/platforms/powermac/cpufreq_32.c
+++ b/arch/powerpc/platforms/powermac/cpufreq_32.c
@@ -68,7 +68,7 @@
 static unsigned int sleep_freq;
 
 /*
- * Different models uses different mecanisms to switch the frequency
+ * Different models uses different mechanisms to switch the frequency
  */
 static int (*set_speed_proc)(int low_speed);
 static unsigned int (*get_speed_proc)(void);