FRV: Replace pgd management via slabs through quicklists

This is done in order to be able to run SLUB which expects no modifications
to its page structs.

Signed-off-by: Christoph Lameter <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/frv/Kconfig

···
 	bool
 	default y
 
+config QUICKLIST
+	bool
+	default y
+
 config ARCH_HAS_ILOG2_U32
 	bool
 	default y
 
 config ARCH_HAS_ILOG2_U64
-	bool
-	default y
-
-config ARCH_USES_SLAB_PAGE_STRUCT
 	bool
 	default y
 

arch/frv/kernel/process.c

···
 #include <linux/elf.h>
 #include <linux/reboot.h>
 #include <linux/interrupt.h>
+#include <linux/pagemap.h>
 
 #include <asm/asm-offsets.h>
 #include <asm/uaccess.h>
 #include <asm/system.h>
 #include <asm/setup.h>
 #include <asm/pgtable.h>
+#include <asm/tlb.h>
 #include <asm/gdb-stub.h>
 #include <asm/mb-regs.h>
 
···
 	while (1) {
 		while (!need_resched()) {
 			irq_stat[cpu].idle_timestamp = jiffies;
+
+			check_pgt_cache();
 
 			if (!frv_dma_inprogress && idle)
 				idle();

arch/frv/mm/pgalloc.c

···
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/highmem.h>
+#include <linux/quicklist.h>
 #include <asm/pgalloc.h>
 #include <asm/page.h>
 #include <asm/cacheflush.h>
 
 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((aligned(PAGE_SIZE)));
-struct kmem_cache *pgd_cache;
 
 pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 {
···
 		set_page_private(next, (unsigned long) pprev);
 }
 
-void pgd_ctor(void *pgd, struct kmem_cache *cache, unsigned long unused)
+void pgd_ctor(void *pgd)
 {
 	unsigned long flags;
 
···
 }
 
 /* never called when PTRS_PER_PMD > 1 */
-void pgd_dtor(void *pgd, struct kmem_cache *cache, unsigned long unused)
+void pgd_dtor(void *pgd)
 {
 	unsigned long flags; /* can be called from interrupt context */
 
···
 {
 	pgd_t *pgd;
 
-	pgd = kmem_cache_alloc(pgd_cache, GFP_KERNEL);
+	pgd = quicklist_alloc(0, GFP_KERNEL, pgd_ctor);
 	if (!pgd)
 		return pgd;
 
···
 void pgd_free(pgd_t *pgd)
 {
 	/* in the non-PAE case, clear_page_tables() clears user pgd entries */
-	kmem_cache_free(pgd_cache, pgd);
+ 	quicklist_free(0, pgd_dtor, pgd);
 }
 
 void __init pgtable_cache_init(void)
 {
-	pgd_cache = kmem_cache_create("pgd",
-				      PTRS_PER_PGD * sizeof(pgd_t),
-				      PTRS_PER_PGD * sizeof(pgd_t),
-				      SLAB_PANIC,
-				      pgd_ctor,
-				      pgd_dtor);
 }
+
+void check_pgt_cache(void)
+{
+	quicklist_trim(0, pgd_dtor, 25, 16);
+}
+

include/asm-frv/tlb.h

···
 
 #include <asm/tlbflush.h>
 
+#ifdef CONFIG_MMU
+extern void check_pgt_cache(void);
+#else
 #define check_pgt_cache() do {} while(0)
+#endif
 
 /*
  * we don't need any special per-pte or per-vma handling...