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ANDROID: mm: fix build issue in spf when CONFIG_USERFAULTFD=n

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When CONFIG_USERFAULTFD=n __VM_UFFD_FLAGS mask is undefined and produces
build error. Fix it by making the check conditional on CONFIG_USERFAULTFD.

Fixes: ("ANDROID: mm: prevent speculative page fault handling for userfaults")
Bug: 257443051
Change-Id: Ie9ff98b840032eb18183b49e3566cf178359948f
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan
2022-11-27 09:18:39 -08:00
parent 1c828eb3da
commit aaf03dd58c
1 changed files with 2 additions and 0 deletions
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2
mm/memory.c
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@@ -5021,11 +5021,13 @@ static vm_fault_t ___handle_speculative_fault(struct mm_struct *mm,
vmf.vma_flags = READ_ONCE(vmf.vma->vm_flags);
vmf.vma_page_prot = READ_ONCE(vmf.vma->vm_page_prot);
#ifdef CONFIG_USERFAULTFD
/* Can't call userland page fault handler in the speculative path */
if (unlikely(vmf.vma_flags & __VM_UFFD_FLAGS)) {
trace_spf_vma_notsup(_RET_IP_, vmf.vma, address);
return VM_FAULT_RETRY;
}
#endif
if (vmf.vma_flags & VM_GROWSDOWN || vmf.vma_flags & VM_GROWSUP) {
/*