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Subjectalpha update for pte highmem stuff in 2.5.5
# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.369.8.3 -> 1.369.8.4
# include/asm-alpha/pgalloc.h 1.6 -> 1.7
# include/asm-alpha/system.h 1.7 -> 1.8
# arch/alpha/kernel/core_irongate.c 1.3 -> 1.4
# include/linux/highmem.h 1.11 -> 1.12
# include/asm-alpha/pgtable.h 1.9 -> 1.10
# arch/alpha/kernel/process.c 1.11 -> 1.12
# arch/alpha/mm/init.c 1.6 -> 1.7
# include/asm-alpha/smp.h 1.5 -> 1.6
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 02/02/21 rth@fidel.sfbay.redhat.com 1.369.8.4
# Update Alpha for Ingo's page tables in highmem patch.
# --------------------------------------------
#
diff -Nru a/arch/alpha/kernel/core_irongate.c b/arch/alpha/kernel/core_irongate.c
--- a/arch/alpha/kernel/core_irongate.c Thu Feb 21 18:35:40 2002
+++ b/arch/alpha/kernel/core_irongate.c Thu Feb 21 18:35:40 2002
@@ -455,7 +455,7 @@
if (address >= end)
BUG();
do {
- pte_t * pte = pte_alloc(&init_mm, pmd, address);
+ pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
if (!pte)
return -ENOMEM;
irongate_remap_area_pte(pte, address, end - address,
diff -Nru a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
--- a/arch/alpha/kernel/process.c Thu Feb 21 18:35:40 2002
+++ b/arch/alpha/kernel/process.c Thu Feb 21 18:35:40 2002
@@ -64,7 +64,6 @@
while (!need_resched())
barrier();
schedule();
- check_pgt_cache();
}
}

diff -Nru a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
--- a/arch/alpha/mm/init.c Thu Feb 21 18:35:40 2002
+++ b/arch/alpha/mm/init.c Thu Feb 21 18:35:40 2002
@@ -42,12 +42,8 @@

static struct pcb_struct original_pcb;

-#ifndef CONFIG_SMP
-struct pgtable_cache_struct quicklists;
-#endif
-
pgd_t *
-get_pgd_slow(void)
+pgd_alloc(struct mm_struct *mm)
{
pgd_t *ret, *init;

@@ -69,28 +65,26 @@
return ret;
}

-int do_check_pgt_cache(int low, int high)
+pte_t *
+pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
- int freed = 0;
- if(pgtable_cache_size > high) {
- do {
- if(pgd_quicklist) {
- free_pgd_slow(get_pgd_fast());
- freed++;
- }
- if(pmd_quicklist) {
- pmd_free_slow(pmd_alloc_one_fast(NULL, 0));
- freed++;
- }
- if(pte_quicklist) {
- pte_free_slow(pte_alloc_one_fast(NULL, 0));
- freed++;
- }
- } while(pgtable_cache_size > low);
+ pte_t *pte;
+ long timeout = 10;
+
+ retry:
+ pte = (pte_t *) __get_free_page(GFP_KERNEL);
+ if (pte)
+ clear_page(pte);
+ else if (--timeout >= 0) {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(HZ);
+ goto retry;
}
- return freed;
+
+ return pte;
}

+
/*
* BAD_PAGE is the page that is used for page faults when linux
* is out-of-memory. Older versions of linux just did a
@@ -145,7 +139,6 @@
printk("%ld reserved pages\n",reserved);
printk("%ld pages shared\n",shared);
printk("%ld pages swap cached\n",cached);
- printk("%ld pages in page table cache\n",pgtable_cache_size);
show_buffers();
}
#endif
@@ -260,7 +253,7 @@
unsigned long paddr = crb->map[i].pa;
crb->map[i].va = vaddr;
for (j = 0; j < crb->map[i].count; ++j) {
- set_pte(pte_offset(pmd, vaddr),
+ set_pte(pte_offset_kernel(pmd, vaddr),
mk_pte_phys(paddr, PAGE_KERNEL));
paddr += PAGE_SIZE;
vaddr += PAGE_SIZE;
diff -Nru a/include/asm-alpha/pgalloc.h b/include/asm-alpha/pgalloc.h
--- a/include/asm-alpha/pgalloc.h Thu Feb 21 18:35:40 2002
+++ b/include/asm-alpha/pgalloc.h Thu Feb 21 18:35:40 2002
@@ -230,121 +230,66 @@
* used to allocate a kernel page table - this turns on ASN bits
* if any.
*/
-#ifndef CONFIG_SMP
-extern struct pgtable_cache_struct {
- unsigned long *pgd_cache;
- unsigned long *pmd_cache;
- unsigned long *pte_cache;
- unsigned long pgtable_cache_sz;
-} quicklists;
-#else
-#include <asm/smp.h>
-#define quicklists cpu_data[smp_processor_id()]
-#endif
-#define pgd_quicklist (quicklists.pgd_cache)
-#define pmd_quicklist (quicklists.pmd_cache)
-#define pte_quicklist (quicklists.pte_cache)
-#define pgtable_cache_size (quicklists.pgtable_cache_sz)
-
-#define pmd_populate(mm, pmd, pte) pmd_set(pmd, pte)
-#define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
-
-extern pgd_t *get_pgd_slow(void);
-
-static inline pgd_t *get_pgd_fast(void)
-{
- unsigned long *ret;
-
- if ((ret = pgd_quicklist) != NULL) {
- pgd_quicklist = (unsigned long *)(*ret);
- ret[0] = 0;
- pgtable_cache_size--;
- } else
- ret = (unsigned long *)get_pgd_slow();
- return (pgd_t *)ret;
-}
-
-static inline void free_pgd_fast(pgd_t *pgd)
-{
- *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
- pgd_quicklist = (unsigned long *) pgd;
- pgtable_cache_size++;
-}

-static inline void free_pgd_slow(pgd_t *pgd)
+static inline void
+pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
{
- free_page((unsigned long)pgd);
+ pmd_set(pmd, (pte_t *)((pte - mem_map) << PAGE_SHIFT));
}

-static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+static inline void
+pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
- pmd_t *ret = (pmd_t *)__get_free_page(GFP_KERNEL);
- if (ret)
- clear_page(ret);
- return ret;
+ pmd_set(pmd, pte);
}

-static inline pmd_t *pmd_alloc_one_fast(struct mm_struct *mm, unsigned long address)
+static inline void
+pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
{
- unsigned long *ret;
-
- if ((ret = (unsigned long *)pte_quicklist) != NULL) {
- pte_quicklist = (unsigned long *)(*ret);
- ret[0] = 0;
- pgtable_cache_size--;
- }
- return (pmd_t *)ret;
+ pgd_set(pgd, pmd);
}

-static inline void pmd_free_fast(pmd_t *pmd)
+extern pgd_t *pgd_alloc(struct mm_struct *mm);
+
+static inline void
+pgd_free(pgd_t *pgd)
{
- *(unsigned long *)pmd = (unsigned long) pte_quicklist;
- pte_quicklist = (unsigned long *) pmd;
- pgtable_cache_size++;
+ free_page((unsigned long)pgd);
}

-static inline void pmd_free_slow(pmd_t *pmd)
+static inline pmd_t *
+pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
- free_page((unsigned long)pmd);
+ pmd_t *ret = (pmd_t *)__get_free_page(GFP_KERNEL);
+ if (ret)
+ clear_page(ret);
+ return ret;
}

-static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+static inline void
+pmd_free(pmd_t *pmd)
{
- pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL);
- if (pte)
- clear_page(pte);
- return pte;
+ free_page((unsigned long)pmd);
}

-static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
-{
- unsigned long *ret;
+extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);

- if ((ret = (unsigned long *)pte_quicklist) != NULL) {
- pte_quicklist = (unsigned long *)(*ret);
- ret[0] = 0;
- pgtable_cache_size--;
- }
- return (pte_t *)ret;
+static inline void
+pte_free_kernel(pte_t *pte)
+{
+ free_page((unsigned long)pte);
}

-static inline void pte_free_fast(pte_t *pte)
+static inline struct page *
+pte_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- *(unsigned long *)pte = (unsigned long) pte_quicklist;
- pte_quicklist = (unsigned long *) pte;
- pgtable_cache_size++;
+ return virt_to_page(pte_alloc_one_kernel(mm, addr));
}

-static inline void pte_free_slow(pte_t *pte)
+static inline void
+pte_free(struct page *page)
{
- free_page((unsigned long)pte);
+ __free_page(page);
}
-
-#define pte_free(pte) pte_free_fast(pte)
-#define pmd_free(pmd) pmd_free_fast(pmd)
-#define pgd_free(pgd) free_pgd_fast(pgd)
-#define pgd_alloc(mm) get_pgd_fast()
-
-extern int do_check_pgt_cache(int, int);

#endif /* _ALPHA_PGALLOC_H */
diff -Nru a/include/asm-alpha/pgtable.h b/include/asm-alpha/pgtable.h
--- a/include/asm-alpha/pgtable.h Thu Feb 21 18:35:40 2002
+++ b/include/asm-alpha/pgtable.h Thu Feb 21 18:35:40 2002
@@ -248,8 +248,13 @@
})
#endif

-extern inline unsigned long pmd_page(pmd_t pmd)
-{ return PAGE_OFFSET + ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)); }
+extern inline unsigned long
+pmd_page_kernel(pmd_t pmd)
+{
+ return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
+}
+
+#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) & _PFN_MASK) >> 32))

extern inline unsigned long pgd_page(pgd_t pgd)
{ return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); }
@@ -306,10 +311,16 @@
}

/* Find an entry in the third-level page table.. */
-extern inline pte_t * pte_offset(pmd_t * dir, unsigned long address)
+extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
{
- return (pte_t *) pmd_page(*dir) + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
+ return (pte_t *) pmd_page_kernel(*dir)
+ + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
}
+
+#define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr))
+#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir),(addr))
+#define pte_unmap(pte) do { } while (0)
+#define pte_unmap_nested(pte) do { } while (0)

extern pgd_t swapper_pg_dir[1024];

diff -Nru a/include/asm-alpha/smp.h b/include/asm-alpha/smp.h
--- a/include/asm-alpha/smp.h Thu Feb 21 18:35:40 2002
+++ b/include/asm-alpha/smp.h Thu Feb 21 18:35:40 2002
@@ -29,10 +29,6 @@
unsigned long last_asn;
int need_new_asn;
int asn_lock;
- unsigned long *pgd_cache;
- unsigned long *pmd_cache;
- unsigned long *pte_cache;
- unsigned long pgtable_cache_sz;
unsigned long ipi_count;
unsigned long irq_attempt[NR_IRQS];
unsigned long prof_multiplier;
diff -Nru a/include/asm-alpha/system.h b/include/asm-alpha/system.h
--- a/include/asm-alpha/system.h Thu Feb 21 18:35:40 2002
+++ b/include/asm-alpha/system.h Thu Feb 21 18:35:40 2002
@@ -137,6 +137,7 @@
check_mmu_context(); \
} while (0)

+struct task_struct;
extern void alpha_switch_to(unsigned long, struct task_struct*);

#define mb() \
diff -Nru a/include/linux/highmem.h b/include/linux/highmem.h
--- a/include/linux/highmem.h Thu Feb 21 18:35:40 2002
+++ b/include/linux/highmem.h Thu Feb 21 18:35:40 2002
@@ -4,6 +4,7 @@
#include <linux/config.h>
#include <linux/bio.h>
#include <linux/fs.h>
+#include <asm/pgalloc.h>

#ifdef CONFIG_HIGHMEM

-
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