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authorLogan Gunthorpe <logang@deltatee.com>2022-10-21 11:41:08 -0600
committerJens Axboe <axboe@kernel.dk>2022-11-09 11:29:20 -0700
commit0f0892356fa174bdd8bd655c820ee3658c4c9f01 (patch)
tree905f8673a7c67c1947fd197fba64e935cbec53b4 /mm
parent5b2560c4c20e6d6933625b4b56f6843d6c7faf0f (diff)
downloadlinux-0f0892356fa174bdd8bd655c820ee3658c4c9f01.tar.bz2
mm: allow multiple error returns in try_grab_page()
In order to add checks for P2PDMA memory into try_grab_page(), expand the error return from a bool to an int/error code. Update all the callsites handle change in usage. Also remove the WARN_ON_ONCE() call at the callsites seeing there already is a WARN_ON_ONCE() inside the function if it fails. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20221021174116.7200-2-logang@deltatee.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm')
-rw-r--r--mm/gup.c26
-rw-r--r--mm/huge_memory.c19
-rw-r--r--mm/hugetlb.c17
3 files changed, 36 insertions, 26 deletions
diff --git a/mm/gup.c b/mm/gup.c
index fe195d47de74..e2f447446384 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -202,17 +202,19 @@ static void gup_put_folio(struct folio *folio, int refs, unsigned int flags)
* time. Cases: please see the try_grab_folio() documentation, with
* "refs=1".
*
- * Return: true for success, or if no action was required (if neither FOLL_PIN
- * nor FOLL_GET was set, nothing is done). False for failure: FOLL_GET or
- * FOLL_PIN was set, but the page could not be grabbed.
+ * Return: 0 for success, or if no action was required (if neither FOLL_PIN
+ * nor FOLL_GET was set, nothing is done). A negative error code for failure:
+ *
+ * -ENOMEM FOLL_GET or FOLL_PIN was set, but the page could not
+ * be grabbed.
*/
-bool __must_check try_grab_page(struct page *page, unsigned int flags)
+int __must_check try_grab_page(struct page *page, unsigned int flags)
{
struct folio *folio = page_folio(page);
WARN_ON_ONCE((flags & (FOLL_GET | FOLL_PIN)) == (FOLL_GET | FOLL_PIN));
if (WARN_ON_ONCE(folio_ref_count(folio) <= 0))
- return false;
+ return -ENOMEM;
if (flags & FOLL_GET)
folio_ref_inc(folio);
@@ -232,7 +234,7 @@ bool __must_check try_grab_page(struct page *page, unsigned int flags)
node_stat_mod_folio(folio, NR_FOLL_PIN_ACQUIRED, 1);
}
- return true;
+ return 0;
}
/**
@@ -624,8 +626,9 @@ retry:
!PageAnonExclusive(page), page);
/* try_grab_page() does nothing unless FOLL_GET or FOLL_PIN is set. */
- if (unlikely(!try_grab_page(page, flags))) {
- page = ERR_PTR(-ENOMEM);
+ ret = try_grab_page(page, flags);
+ if (unlikely(ret)) {
+ page = ERR_PTR(ret);
goto out;
}
/*
@@ -960,10 +963,9 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
goto unmap;
*page = pte_page(*pte);
}
- if (unlikely(!try_grab_page(*page, gup_flags))) {
- ret = -ENOMEM;
+ ret = try_grab_page(*page, gup_flags);
+ if (unlikely(ret))
goto unmap;
- }
out:
ret = 0;
unmap:
@@ -2536,7 +2538,7 @@ static int __gup_device_huge(unsigned long pfn, unsigned long addr,
}
SetPageReferenced(page);
pages[*nr] = page;
- if (unlikely(!try_grab_page(page, flags))) {
+ if (unlikely(try_grab_page(page, flags))) {
undo_dev_pagemap(nr, nr_start, flags, pages);
break;
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 03fc7e5edf07..01e2de93d61a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1035,6 +1035,7 @@ struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn = pmd_pfn(*pmd);
struct mm_struct *mm = vma->vm_mm;
struct page *page;
+ int ret;
assert_spin_locked(pmd_lockptr(mm, pmd));
@@ -1066,8 +1067,9 @@ struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
if (!*pgmap)
return ERR_PTR(-EFAULT);
page = pfn_to_page(pfn);
- if (!try_grab_page(page, flags))
- page = ERR_PTR(-ENOMEM);
+ ret = try_grab_page(page, flags);
+ if (ret)
+ page = ERR_PTR(ret);
return page;
}
@@ -1193,6 +1195,7 @@ struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn = pud_pfn(*pud);
struct mm_struct *mm = vma->vm_mm;
struct page *page;
+ int ret;
assert_spin_locked(pud_lockptr(mm, pud));
@@ -1226,8 +1229,10 @@ struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
if (!*pgmap)
return ERR_PTR(-EFAULT);
page = pfn_to_page(pfn);
- if (!try_grab_page(page, flags))
- page = ERR_PTR(-ENOMEM);
+
+ ret = try_grab_page(page, flags);
+ if (ret)
+ page = ERR_PTR(ret);
return page;
}
@@ -1435,6 +1440,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
{
struct mm_struct *mm = vma->vm_mm;
struct page *page;
+ int ret;
assert_spin_locked(pmd_lockptr(mm, pmd));
@@ -1459,8 +1465,9 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
VM_BUG_ON_PAGE((flags & FOLL_PIN) && PageAnon(page) &&
!PageAnonExclusive(page), page);
- if (!try_grab_page(page, flags))
- return ERR_PTR(-ENOMEM);
+ ret = try_grab_page(page, flags);
+ if (ret)
+ return ERR_PTR(ret);
if (flags & FOLL_TOUCH)
touch_pmd(vma, addr, pmd, flags & FOLL_WRITE);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 546df97c31e4..67f39550520e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -7243,14 +7243,15 @@ retry:
page = pte_page(pte) +
((address & ~huge_page_mask(h)) >> PAGE_SHIFT);
/*
- * try_grab_page() should always succeed here, because: a) we
- * hold the pmd (ptl) lock, and b) we've just checked that the
- * huge pmd (head) page is present in the page tables. The ptl
- * prevents the head page and tail pages from being rearranged
- * in any way. So this page must be available at this point,
- * unless the page refcount overflowed:
+ * try_grab_page() should always be able to get the page here,
+ * because: a) we hold the pmd (ptl) lock, and b) we've just
+ * checked that the huge pmd (head) page is present in the
+ * page tables. The ptl prevents the head page and tail pages
+ * from being rearranged in any way. So this page must be
+ * available at this point, unless the page refcount
+ * overflowed:
*/
- if (WARN_ON_ONCE(!try_grab_page(page, flags))) {
+ if (try_grab_page(page, flags)) {
page = NULL;
goto out;
}
@@ -7288,7 +7289,7 @@ retry:
pte = huge_ptep_get((pte_t *)pud);
if (pte_present(pte)) {
page = pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
- if (WARN_ON_ONCE(!try_grab_page(page, flags))) {
+ if (try_grab_page(page, flags)) {
page = NULL;
goto out;
}