[PATCH] Nuke check_highmem_ptes()

It was broken on at least ppc32 & sparc32, and the debugging it
offered wasn't worth it any more anyway.

include/linux/highmem.h

@@ -32,13 +32,6 @@ static inline void *kmap(struct page *page)
 
 #endif /* CONFIG_HIGHMEM */
 
-#if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_HIGHMEM)
-extern void check_highmem_ptes(void);
-#else
-static inline void check_highmem_ptes(void)
-{}
-#endif
-
 /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
 static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
 {

kernel/sched.c

@@ -1258,7 +1258,6 @@ asmlinkage void schedule(void)
 		}
 	}
 
-	check_highmem_ptes();
 need_resched:
 	preempt_disable();
 	prev = current;

mm/highmem.c

@@ -472,23 +472,6 @@ void blk_queue_bounce(request_queue_t *q, struct bio **bio_orig)
 	__blk_queue_bounce(q, bio_orig, pool);
 }
 
-#if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_HIGHMEM)
-void check_highmem_ptes(void)
-{
-	int idx, type;
-
-	preempt_disable();
-	for (type = 0; type < KM_TYPE_NR; type++) {
-		idx = type + KM_TYPE_NR*smp_processor_id();
-		if (!pte_none(*(kmap_pte-idx))) {
-			printk("scheduling with KM_TYPE %d held!\n", type);
-			BUG();
-		}
-	}
-	preempt_enable();
-}
-#endif
-
 #if defined(HASHED_PAGE_VIRTUAL)
 
 #define PA_HASH_ORDER	7