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Two hotfixes, both cc:stable.

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Merge tag 'mm-hotfixes-stable-2022-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Two hotfixes, both cc:stable"

* tag 'mm-hotfixes-stable-2022-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  mm/hmm: fault non-owner device private entries
  page_alloc: fix invalid watermark check on a negative value
This commit is contained in:
Linus Torvalds 2022-07-29 21:02:35 -07:00
commit 620725263f
2 changed files with 16 additions and 15 deletions
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19
mm/hmm.c
View File

@ -212,14 +212,6 @@ int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
unsigned long end, unsigned long hmm_pfns[], pmd_t pmd);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline bool hmm_is_device_private_entry(struct hmm_range *range,
swp_entry_t entry)
{
return is_device_private_entry(entry) &&
pfn_swap_entry_to_page(entry)->pgmap->owner ==
range->dev_private_owner;
}
static inline unsigned long pte_to_hmm_pfn_flags(struct hmm_range *range,
pte_t pte)
{
@ -252,10 +244,12 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
swp_entry_t entry = pte_to_swp_entry(pte);
/*
* Never fault in device private pages, but just report
* the PFN even if not present.
* Don't fault in device private pages owned by the caller,
* just report the PFN.
*/
if (hmm_is_device_private_entry(range, entry)) {
if (is_device_private_entry(entry) &&
pfn_swap_entry_to_page(entry)->pgmap->owner ==
range->dev_private_owner) {
cpu_flags = HMM_PFN_VALID;
if (is_writable_device_private_entry(entry))
cpu_flags |= HMM_PFN_WRITE;
@ -273,6 +267,9 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
if (!non_swap_entry(entry))
goto fault;
if (is_device_private_entry(entry))
goto fault;
if (is_device_exclusive_entry(entry))
goto fault;

12
mm/page_alloc.c
View File

@ -3968,11 +3968,15 @@ static inline bool zone_watermark_fast(struct zone *z, unsigned int order,
* need to be calculated.
*/
if (!order) {
long fast_free;
long usable_free;
long reserved;
fast_free = free_pages;
fast_free -= __zone_watermark_unusable_free(z, 0, alloc_flags);
if (fast_free > mark + z->lowmem_reserve[highest_zoneidx])
usable_free = free_pages;
reserved = __zone_watermark_unusable_free(z, 0, alloc_flags);
/* reserved may over estimate high-atomic reserves. */
usable_free -= min(usable_free, reserved);
if (usable_free > mark + z->lowmem_reserve[highest_zoneidx])
return true;
}