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Merge branch 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

Browse Source 
Pull x86 cdso updates from Peter Anvin:
 "Vdso cleanups and improvements largely from Andy Lutomirski.  This
  makes the vdso a lot less ''special''"

* 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/vdso, build: Make LE access macros clearer, host-safe
  x86/vdso, build: Fix cross-compilation from big-endian architectures
  x86/vdso, build: When vdso2c fails, unlink the output
  x86, vdso: Fix an OOPS accessing the HPET mapping w/o an HPET
  x86, mm: Replace arch_vma_name with vm_ops->name for vsyscalls
  x86, mm: Improve _install_special_mapping and fix x86 vdso naming
  mm, fs: Add vm_ops->name as an alternative to arch_vma_name
  x86, vdso: Fix an OOPS accessing the HPET mapping w/o an HPET
  x86, vdso: Remove vestiges of VDSO_PRELINK and some outdated comments
  x86, vdso: Move the vvar and hpet mappings next to the 64-bit vDSO
  x86, vdso: Move the 32-bit vdso special pages after the text
  x86, vdso: Reimplement vdso.so preparation in build-time C
  x86, vdso: Move syscall and sysenter setup into kernel/cpu/common.c
  x86, vdso: Clean up 32-bit vs 64-bit vdso params
  x86, mm: Ensure correct alignment of the fixmap
This commit is contained in:
Linus Torvalds
2014-06-05 08:05:29 -07:00
parent 2071b3e34f c191920f73
commit a0abcf2e8f
40 changed files with 798 additions and 612 deletions
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89
mm/mmap.c
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@@ -2871,6 +2871,31 @@ int may_expand_vm(struct mm_struct *mm, unsigned long npages)
return 1;
}
static int special_mapping_fault(struct vm_area_struct *vma,
struct vm_fault *vmf);
/*
* Having a close hook prevents vma merging regardless of flags.
*/
static void special_mapping_close(struct vm_area_struct *vma)
{
}
static const char *special_mapping_name(struct vm_area_struct *vma)
{
return ((struct vm_special_mapping *)vma->vm_private_data)->name;
}
static const struct vm_operations_struct special_mapping_vmops = {
.close = special_mapping_close,
.fault = special_mapping_fault,
.name = special_mapping_name,
};
static const struct vm_operations_struct legacy_special_mapping_vmops = {
.close = special_mapping_close,
.fault = special_mapping_fault,
};
static int special_mapping_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
@@ -2886,7 +2911,13 @@ static int special_mapping_fault(struct vm_area_struct *vma,
*/
pgoff = vmf->pgoff - vma->vm_pgoff;
for (pages = vma->vm_private_data; pgoff && *pages; ++pages)
if (vma->vm_ops == &legacy_special_mapping_vmops)
pages = vma->vm_private_data;
else
pages = ((struct vm_special_mapping *)vma->vm_private_data)->
pages;
for (; pgoff && *pages; ++pages)
pgoff--;
if (*pages) {
@@ -2899,30 +2930,11 @@ static int special_mapping_fault(struct vm_area_struct *vma,
return VM_FAULT_SIGBUS;
}
/*
* Having a close hook prevents vma merging regardless of flags.
*/
static void special_mapping_close(struct vm_area_struct *vma)
{
}
static const struct vm_operations_struct special_mapping_vmops = {
.close = special_mapping_close,
.fault = special_mapping_fault,
};
/*
* Called with mm->mmap_sem held for writing.
* Insert a new vma covering the given region, with the given flags.
* Its pages are supplied by the given array of struct page *.
* The array can be shorter than len >> PAGE_SHIFT if it's null-terminated.
* The region past the last page supplied will always produce SIGBUS.
* The array pointer and the pages it points to are assumed to stay alive
* for as long as this mapping might exist.
*/
struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long vm_flags, struct page **pages)
static struct vm_area_struct *__install_special_mapping(
struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long vm_flags, const struct vm_operations_struct *ops,
void *priv)
{
int ret;
struct vm_area_struct *vma;
@@ -2939,8 +2951,8 @@ struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
vma->vm_flags = vm_flags | mm->def_flags | VM_DONTEXPAND | VM_SOFTDIRTY;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
vma->vm_ops = &special_mapping_vmops;
vma->vm_private_data = pages;
vma->vm_ops = ops;
vma->vm_private_data = priv;
ret = insert_vm_struct(mm, vma);
if (ret)
@@ -2957,12 +2969,31 @@ out:
return ERR_PTR(ret);
}
/*
* Called with mm->mmap_sem held for writing.
* Insert a new vma covering the given region, with the given flags.
* Its pages are supplied by the given array of struct page *.
* The array can be shorter than len >> PAGE_SHIFT if it's null-terminated.
* The region past the last page supplied will always produce SIGBUS.
* The array pointer and the pages it points to are assumed to stay alive
* for as long as this mapping might exist.
*/
struct vm_area_struct *_install_special_mapping(
struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long vm_flags, const struct vm_special_mapping *spec)
{
return __install_special_mapping(mm, addr, len, vm_flags,
&special_mapping_vmops, (void *)spec);
}
int install_special_mapping(struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long vm_flags, struct page **pages)
{
struct vm_area_struct *vma = _install_special_mapping(mm,
addr, len, vm_flags, pages);
struct vm_area_struct *vma = __install_special_mapping(
mm, addr, len, vm_flags, &legacy_special_mapping_vmops,
(void *)pages);
return PTR_ERR_OR_ZERO(vma);
}