Revert "sh: Ensure fixmap and store queue space can co-exist."

This reverts commit 20e7c297.
With store queues enabled the area above P4SEG has special properties
from the MMU's point of view, which was causing fixmap failure. We'll
have to do something else to satisfy the vmalloc range check.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/fixmap.h

@@ -94,7 +94,7 @@ extern void __clear_fixmap(enum fixed_addresses idx, pgprot_t flags);
  * at the top of mem..
  */
 #ifdef CONFIG_SUPERH32
-#define FIXADDR_TOP	(P3_ADDR_MAX - PAGE_SIZE)
+#define FIXADDR_TOP	(P4SEG - PAGE_SIZE)
 #else
 #define FIXADDR_TOP	((unsigned long)(-PAGE_SIZE))
 #endif

arch/sh/mm/fault.c

@@ -169,8 +169,8 @@ static noinline int vmalloc_fault(unsigned long address)
 	pmd_t *pmd_k;
 	pte_t *pte_k;
 
-	/* Make sure we are in vmalloc/module area: */
-	if (!is_vmalloc_addr((void *)address))
+	/* Make sure we are in vmalloc/module/P3 area: */
+	if (!(address >= P3SEG && address < P3_ADDR_MAX))
 		return -1;
 
 	/*