sh: generic quicklist support.

This moves SH over to the generic quicklists. As per x86_64,
we have special mappings for the PGDs, so these go on their
own list..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/process.c

@@ -18,6 +18,7 @@
 #include <asm/kdebug.h>
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
+#include <asm/pgalloc.h>
 #include <asm/ubc.h>
 
 static int hlt_counter;
@@ -64,6 +65,7 @@ void cpu_idle(void)
 		preempt_enable_no_resched();
 		schedule();
 		preempt_disable();
+		check_pgt_cache();
 	}
 }
 

arch/sh/mm/Kconfig

@@ -218,6 +218,9 @@ endmenu
 
 menu "Memory management options"
 
+config QUICKLIST
+	def_bool y
+
 config MMU
         bool "Support for memory management hardware"
 	depends on !CPU_SH2

arch/sh/mm/init.c

@@ -67,6 +67,8 @@ void show_mem(void)
 	printk("%d slab pages\n", slab);
 	printk("%d pages shared\n", shared);
 	printk("%d pages swap cached\n", cached);
+	printk(KERN_INFO "Total of %ld pages in page table cache\n",
+	       quicklist_total_size());
 }
 
 #ifdef CONFIG_MMU

include/asm-sh/pgalloc.h

 #ifndef __ASM_SH_PGALLOC_H
 #define __ASM_SH_PGALLOC_H
 
+#include <linux/quicklist.h>
+#include <asm/page.h>
+
+#define QUICK_PGD 0	/* We preserve special mappings over free */
+#define QUICK_PT 1	/* Other page table pages that are zero on free */
+
 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 				       pte_t *pte)
 {
@@ -13,48 +19,49 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
 }
 
+static inline void pgd_ctor(void *x)
+{
+	pgd_t *pgd = x;
+
+	memcpy(pgd + USER_PTRS_PER_PGD,
+	       swapper_pg_dir + USER_PTRS_PER_PGD,
+	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+}
+
 /*
  * Allocate and free page tables.
  */
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
-	pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
-
-	if (pgd) {
-		memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
-		memcpy(pgd + USER_PTRS_PER_PGD,
-		       swapper_pg_dir + USER_PTRS_PER_PGD,
-		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
-	}
-
-	return pgd;
+	return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
 }
 
 static inline void pgd_free(pgd_t *pgd)
 {
-	free_page((unsigned long)pgd);
+	quicklist_free(QUICK_PGD, NULL, pgd);
 }
 
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 					  unsigned long address)
 {
-	return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
+	return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
 }
 
 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 					 unsigned long address)
 {
-	return alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
+	void *pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
+	return pg ? virt_to_page(pg) : NULL;
 }
 
 static inline void pte_free_kernel(pte_t *pte)
 {
-	free_page((unsigned long)pte);
+	quicklist_free(QUICK_PT, NULL, pte);
 }
 
 static inline void pte_free(struct page *pte)
 {
-	__free_page(pte);
+	quicklist_free_page(QUICK_PT, NULL, pte);
 }
 
 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
@@ -66,6 +73,11 @@ static inline void pte_free(struct page *pte)
 
 #define pmd_free(x)			do { } while (0)
 #define __pmd_free_tlb(tlb,x)		do { } while (0)
-#define check_pgt_cache()		do { } while (0)
+
+static inline void check_pgt_cache(void)
+{
+	quicklist_trim(QUICK_PGD, NULL, 25, 16);
+	quicklist_trim(QUICK_PT, NULL, 25, 16);
+}
 
 #endif /* __ASM_SH_PGALLOC_H */

mm/Kconfig

@@ -166,5 +166,5 @@ config ZONE_DMA_FLAG
 config NR_QUICK
 	int
 	depends on QUICKLIST
+	default "2" if SUPERH
 	default "1"
-