Revision fc6f0700d5cd54b5f8b30c4f0d93b06a6ba04b81 authored by Linus Torvalds on 18 December 2009, 00:38:48 UTC, committed by Linus Torvalds on 18 December 2009, 00:38:48 UTC
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (40 commits) [SCSI] 3w-9xxx fix bug in sgl loading [SCSI] fcoe, libfc: adds enable/disable for fcoe interface [SCSI] libfc: reduce hold time on SCSI host lock [SCSI] libfc: remote port gets stuck in restart state without really restarting [SCSI] pm8001: misc code cleanup [SCSI] pm8001: enable read HBA SAS address from VPD [SCSI] pm8001: do not reset local sata as it will not be found if reset [SCSI] pm8001: bit set pm8001_ha->flags [SCSI] pm8001:fix potential NULL pointer dereference [SCSI] pm8001: set SSC down-spreading only to get less errors on some 6G device. [SCSI] pm8001: fix endian issues with SAS address [SCSI] pm8001: enhance error handle for IO patch [SCSI] pm8001: Fix for sata io circular lock dependency. [SCSI] hpsa: add driver for HP Smart Array controllers. [SCSI] cxgb3i: always use negative errno in case of error [SCSI] bnx2i: minor code cleanup and update driver version [SCSI] bnx2i: Task management ABORT TASK fixes [SCSI] bnx2i: update CQ arming algorith for 5771x chipsets [SCSI] bnx2i: Adjust sq_size module parametr to power of 2 only if a non-zero value is specified [SCSI] bnx2i: Add 5771E device support to bnx2i driver ...
pagewalk.c
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/hugetlb.h>
static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
pte_t *pte;
int err = 0;
pte = pte_offset_map(pmd, addr);
for (;;) {
err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
if (err)
break;
addr += PAGE_SIZE;
if (addr == end)
break;
pte++;
}
pte_unmap(pte);
return err;
}
static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
pmd_t *pmd;
unsigned long next;
int err = 0;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd)) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pmd_entry)
err = walk->pmd_entry(pmd, addr, next, walk);
if (!err && walk->pte_entry)
err = walk_pte_range(pmd, addr, next, walk);
if (err)
break;
} while (pmd++, addr = next, addr != end);
return err;
}
static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
pud_t *pud;
unsigned long next;
int err = 0;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud)) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pud_entry)
err = walk->pud_entry(pud, addr, next, walk);
if (!err && (walk->pmd_entry || walk->pte_entry))
err = walk_pmd_range(pud, addr, next, walk);
if (err)
break;
} while (pud++, addr = next, addr != end);
return err;
}
/**
* walk_page_range - walk a memory map's page tables with a callback
* @mm: memory map to walk
* @addr: starting address
* @end: ending address
* @walk: set of callbacks to invoke for each level of the tree
*
* Recursively walk the page table for the memory area in a VMA,
* calling supplied callbacks. Callbacks are called in-order (first
* PGD, first PUD, first PMD, first PTE, second PTE... second PMD,
* etc.). If lower-level callbacks are omitted, walking depth is reduced.
*
* Each callback receives an entry pointer and the start and end of the
* associated range, and a copy of the original mm_walk for access to
* the ->private or ->mm fields.
*
* No locks are taken, but the bottom level iterator will map PTE
* directories from highmem if necessary.
*
* If any callback returns a non-zero value, the walk is aborted and
* the return value is propagated back to the caller. Otherwise 0 is returned.
*/
int walk_page_range(unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
pgd_t *pgd;
unsigned long next;
int err = 0;
struct vm_area_struct *vma;
if (addr >= end)
return err;
if (!walk->mm)
return -EINVAL;
pgd = pgd_offset(walk->mm, addr);
do {
next = pgd_addr_end(addr, end);
/*
* handle hugetlb vma individually because pagetable walk for
* the hugetlb page is dependent on the architecture and
* we can't handled it in the same manner as non-huge pages.
*/
vma = find_vma(walk->mm, addr);
#ifdef CONFIG_HUGETLB_PAGE
if (vma && is_vm_hugetlb_page(vma)) {
pte_t *pte;
struct hstate *hs;
if (vma->vm_end < next)
next = vma->vm_end;
hs = hstate_vma(vma);
pte = huge_pte_offset(walk->mm,
addr & huge_page_mask(hs));
if (pte && !huge_pte_none(huge_ptep_get(pte))
&& walk->hugetlb_entry)
err = walk->hugetlb_entry(pte, addr,
next, walk);
if (err)
break;
continue;
}
#endif
if (pgd_none_or_clear_bad(pgd)) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
if (err)
break;
pgd++;
continue;
}
if (walk->pgd_entry)
err = walk->pgd_entry(pgd, addr, next, walk);
if (!err &&
(walk->pud_entry || walk->pmd_entry || walk->pte_entry))
err = walk_pud_range(pgd, addr, next, walk);
if (err)
break;
pgd++;
} while (addr = next, addr != end);
return err;
}
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