mm: pagewalk: allow walking without vma
Since 48684a65b4
: "mm: pagewalk: fix misbehavior of walk_page_range for
vma(VM_PFNMAP)", page_table_walk() will report any kernel area as a hole,
because it lacks a vma.
This means each arch has re-implemented page table walking when needed,
for example in the per-arch ptdump walker.
Remove the requirement to have a vma in the generic code and add a new
function walk_page_range_novma() which ignores the VMAs and simply walks
the page tables.
Link: http://lkml.kernel.org/r/20191218162402.45610-13-steven.price@arm.com
Signed-off-by: Steven Price <steven.price@arm.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: "Liang, Kan" <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zong Li <zong.li@sifive.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
3afc423632
commit
488ae6a2b9
2 changed files with 37 additions and 8 deletions
|
@ -73,6 +73,7 @@ enum page_walk_action {
|
|||
* @mm: mm_struct representing the target process of page table walk
|
||||
* @vma: vma currently walked (NULL if walking outside vmas)
|
||||
* @action: next action to perform (see enum page_walk_action)
|
||||
* @no_vma: walk ignoring vmas (vma will always be NULL)
|
||||
* @private: private data for callbacks' usage
|
||||
*
|
||||
* (see the comment on walk_page_range() for more details)
|
||||
|
@ -82,12 +83,16 @@ struct mm_walk {
|
|||
struct mm_struct *mm;
|
||||
struct vm_area_struct *vma;
|
||||
enum page_walk_action action;
|
||||
bool no_vma;
|
||||
void *private;
|
||||
};
|
||||
|
||||
int walk_page_range(struct mm_struct *mm, unsigned long start,
|
||||
unsigned long end, const struct mm_walk_ops *ops,
|
||||
void *private);
|
||||
int walk_page_range_novma(struct mm_struct *mm, unsigned long start,
|
||||
unsigned long end, const struct mm_walk_ops *ops,
|
||||
void *private);
|
||||
int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
|
||||
void *private);
|
||||
int walk_page_mapping(struct address_space *mapping, pgoff_t first_index,
|
||||
|
|
|
@ -39,7 +39,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
|
|||
do {
|
||||
again:
|
||||
next = pmd_addr_end(addr, end);
|
||||
if (pmd_none(*pmd) || !walk->vma) {
|
||||
if (pmd_none(*pmd) || (!walk->vma && !walk->no_vma)) {
|
||||
if (ops->pte_hole)
|
||||
err = ops->pte_hole(addr, next, walk);
|
||||
if (err)
|
||||
|
@ -65,13 +65,16 @@ again:
|
|||
* Check this here so we only break down trans_huge
|
||||
* pages when we _need_ to
|
||||
*/
|
||||
if (walk->action == ACTION_CONTINUE ||
|
||||
if ((!walk->vma && (pmd_leaf(*pmd) || !pmd_present(*pmd))) ||
|
||||
walk->action == ACTION_CONTINUE ||
|
||||
!(ops->pte_entry))
|
||||
continue;
|
||||
|
||||
split_huge_pmd(walk->vma, pmd, addr);
|
||||
if (pmd_trans_unstable(pmd))
|
||||
goto again;
|
||||
if (walk->vma) {
|
||||
split_huge_pmd(walk->vma, pmd, addr);
|
||||
if (pmd_trans_unstable(pmd))
|
||||
goto again;
|
||||
}
|
||||
|
||||
err = walk_pte_range(pmd, addr, next, walk);
|
||||
if (err)
|
||||
|
@ -93,7 +96,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
|
|||
do {
|
||||
again:
|
||||
next = pud_addr_end(addr, end);
|
||||
if (pud_none(*pud) || !walk->vma) {
|
||||
if (pud_none(*pud) || (!walk->vma && !walk->no_vma)) {
|
||||
if (ops->pte_hole)
|
||||
err = ops->pte_hole(addr, next, walk);
|
||||
if (err)
|
||||
|
@ -111,11 +114,13 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
|
|||
if (walk->action == ACTION_AGAIN)
|
||||
goto again;
|
||||
|
||||
if (walk->action == ACTION_CONTINUE ||
|
||||
if ((!walk->vma && (pud_leaf(*pud) || !pud_present(*pud))) ||
|
||||
walk->action == ACTION_CONTINUE ||
|
||||
!(ops->pmd_entry || ops->pte_entry))
|
||||
continue;
|
||||
|
||||
split_huge_pud(walk->vma, pud, addr);
|
||||
if (walk->vma)
|
||||
split_huge_pud(walk->vma, pud, addr);
|
||||
if (pud_none(*pud))
|
||||
goto again;
|
||||
|
||||
|
@ -389,6 +394,25 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
|
|||
return err;
|
||||
}
|
||||
|
||||
int walk_page_range_novma(struct mm_struct *mm, unsigned long start,
|
||||
unsigned long end, const struct mm_walk_ops *ops,
|
||||
void *private)
|
||||
{
|
||||
struct mm_walk walk = {
|
||||
.ops = ops,
|
||||
.mm = mm,
|
||||
.private = private,
|
||||
.no_vma = true
|
||||
};
|
||||
|
||||
if (start >= end || !walk.mm)
|
||||
return -EINVAL;
|
||||
|
||||
lockdep_assert_held(&walk.mm->mmap_sem);
|
||||
|
||||
return __walk_page_range(start, end, &walk);
|
||||
}
|
||||
|
||||
int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
|
||||
void *private)
|
||||
{
|
||||
|
|
Loading…
Reference in a new issue