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authorLinus Torvalds <torvalds@linux-foundation.org>2008-12-28 12:07:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-12-28 12:07:57 -0800
commitbe9c5ae4eeec2e85527e95647348b8ea4eb25128 (patch)
tree59383b15bc0891b8a44500a0ac172a8850f1068d /mm
parentbb26c6c29b7cc9f39e491b074b09f3c284738d36 (diff)
parent79a66b96c339626a3e4b226fefc0e45244cfe6ff (diff)
downloadlinux-2.6.34-ux500-be9c5ae4eeec2e85527e95647348b8ea4eb25128.tar.gz
Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (246 commits) x86: traps.c replace #if CONFIG_X86_32 with #ifdef CONFIG_X86_32 x86: PAT: fix address types in track_pfn_vma_new() x86: prioritize the FPU traps for the error code x86: PAT: pfnmap documentation update changes x86: PAT: move track untrack pfnmap stubs to asm-generic x86: PAT: remove follow_pfnmap_pte in favor of follow_phys x86: PAT: modify follow_phys to return phys_addr prot and return value x86: PAT: clarify is_linear_pfn_mapping() interface x86: ia32_signal: remove unnecessary declaration x86: common.c boot_cpu_stack and boot_exception_stacks should be static x86: fix intel x86_64 llc_shared_map/cpu_llc_id anomolies x86: fix warning in arch/x86/kernel/microcode_amd.c x86: ia32.h: remove unused struct sigfram32 and rt_sigframe32 x86: asm-offset_64: use rt_sigframe_ia32 x86: sigframe.h: include headers for dependency x86: traps.c declare functions before they get used x86: PAT: update documentation to cover pgprot and remap_pfn related changes - v3 x86: PAT: add pgprot_writecombine() interface for drivers - v3 x86: PAT: change pgprot_noncached to uc_minus instead of strong uc - v3 x86: PAT: implement track/untrack of pfnmap regions for x86 - v3 ...
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c70
-rw-r--r--mm/swapfile.c9
2 files changed, 57 insertions, 22 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 164951c4730..f01b7eed6e1 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -669,6 +669,16 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
if (is_vm_hugetlb_page(vma))
return copy_hugetlb_page_range(dst_mm, src_mm, vma);
+ if (unlikely(is_pfn_mapping(vma))) {
+ /*
+ * We do not free on error cases below as remove_vma
+ * gets called on error from higher level routine
+ */
+ ret = track_pfn_vma_copy(vma);
+ if (ret)
+ return ret;
+ }
+
/*
* We need to invalidate the secondary MMU mappings only when
* there could be a permission downgrade on the ptes of the
@@ -915,6 +925,9 @@ unsigned long unmap_vmas(struct mmu_gather **tlbp,
if (vma->vm_flags & VM_ACCOUNT)
*nr_accounted += (end - start) >> PAGE_SHIFT;
+ if (unlikely(is_pfn_mapping(vma)))
+ untrack_pfn_vma(vma, 0, 0);
+
while (start != end) {
if (!tlb_start_valid) {
tlb_start = start;
@@ -1430,6 +1443,7 @@ out:
int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn)
{
+ int ret;
/*
* Technically, architectures with pte_special can avoid all these
* restrictions (same for remap_pfn_range). However we would like
@@ -1444,7 +1458,15 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
if (addr < vma->vm_start || addr >= vma->vm_end)
return -EFAULT;
- return insert_pfn(vma, addr, pfn, vma->vm_page_prot);
+ if (track_pfn_vma_new(vma, vma->vm_page_prot, pfn, PAGE_SIZE))
+ return -EINVAL;
+
+ ret = insert_pfn(vma, addr, pfn, vma->vm_page_prot);
+
+ if (ret)
+ untrack_pfn_vma(vma, pfn, PAGE_SIZE);
+
+ return ret;
}
EXPORT_SYMBOL(vm_insert_pfn);
@@ -1575,14 +1597,17 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
* behaviour that some programs depend on. We mark the "original"
* un-COW'ed pages by matching them up with "vma->vm_pgoff".
*/
- if (is_cow_mapping(vma->vm_flags)) {
- if (addr != vma->vm_start || end != vma->vm_end)
- return -EINVAL;
+ if (addr == vma->vm_start && end == vma->vm_end)
vma->vm_pgoff = pfn;
- }
+ else if (is_cow_mapping(vma->vm_flags))
+ return -EINVAL;
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
+ err = track_pfn_vma_new(vma, prot, pfn, PAGE_ALIGN(size));
+ if (err)
+ return -EINVAL;
+
BUG_ON(addr >= end);
pfn -= addr >> PAGE_SHIFT;
pgd = pgd_offset(mm, addr);
@@ -1594,6 +1619,10 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
if (err)
break;
} while (pgd++, addr = next, addr != end);
+
+ if (err)
+ untrack_pfn_vma(vma, pfn, PAGE_ALIGN(size));
+
return err;
}
EXPORT_SYMBOL(remap_pfn_range);
@@ -2865,9 +2894,9 @@ int in_gate_area_no_task(unsigned long addr)
#endif /* __HAVE_ARCH_GATE_AREA */
#ifdef CONFIG_HAVE_IOREMAP_PROT
-static resource_size_t follow_phys(struct vm_area_struct *vma,
- unsigned long address, unsigned int flags,
- unsigned long *prot)
+int follow_phys(struct vm_area_struct *vma,
+ unsigned long address, unsigned int flags,
+ unsigned long *prot, resource_size_t *phys)
{
pgd_t *pgd;
pud_t *pud;
@@ -2876,24 +2905,26 @@ static resource_size_t follow_phys(struct vm_area_struct *vma,
spinlock_t *ptl;
resource_size_t phys_addr = 0;
struct mm_struct *mm = vma->vm_mm;
+ int ret = -EINVAL;
- VM_BUG_ON(!(vma->vm_flags & (VM_IO | VM_PFNMAP)));
+ if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
+ goto out;
pgd = pgd_offset(mm, address);
if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
- goto no_page_table;
+ goto out;
pud = pud_offset(pgd, address);
if (pud_none(*pud) || unlikely(pud_bad(*pud)))
- goto no_page_table;
+ goto out;
pmd = pmd_offset(pud, address);
if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
- goto no_page_table;
+ goto out;
/* We cannot handle huge page PFN maps. Luckily they don't exist. */
if (pmd_huge(*pmd))
- goto no_page_table;
+ goto out;
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
if (!ptep)
@@ -2908,13 +2939,13 @@ static resource_size_t follow_phys(struct vm_area_struct *vma,
phys_addr <<= PAGE_SHIFT; /* Shift here to avoid overflow on PAE */
*prot = pgprot_val(pte_pgprot(pte));
+ *phys = phys_addr;
+ ret = 0;
unlock:
pte_unmap_unlock(ptep, ptl);
out:
- return phys_addr;
-no_page_table:
- return 0;
+ return ret;
}
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
@@ -2925,12 +2956,7 @@ int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
void *maddr;
int offset = addr & (PAGE_SIZE-1);
- if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
- return -EINVAL;
-
- phys_addr = follow_phys(vma, addr, write, &prot);
-
- if (!phys_addr)
+ if (follow_phys(vma, addr, write, &prot, &phys_addr))
return -EINVAL;
maddr = ioremap_prot(phys_addr, PAGE_SIZE, prot);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 90cb67a5417..54a9f87e516 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1462,6 +1462,15 @@ static int __init procswaps_init(void)
__initcall(procswaps_init);
#endif /* CONFIG_PROC_FS */
+#ifdef MAX_SWAPFILES_CHECK
+static int __init max_swapfiles_check(void)
+{
+ MAX_SWAPFILES_CHECK();
+ return 0;
+}
+late_initcall(max_swapfiles_check);
+#endif
+
/*
* Written 01/25/92 by Simmule Turner, heavily changed by Linus.
*