The patch titled
Subject: userfaultfd: convert BUG() to WARN_ON_ONCE()
has been added to the -mm tree. Its filename is
userfaultfd-convert-bug-to-warn_on_once.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-convert-bug-to-warn_on_once.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-convert-bug-to-warn_on_once.patch
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------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: userfaultfd: convert BUG() to WARN_ON_ONCE()
Avoid BUG_ON()s and only WARN instead. This is just a cleanup, it
can't make any runtime difference. This BUG_ON has never triggered and
cannot trigger.
Link: http://lkml.kernel.org/r/20161216144821.5183-4-aarcange@xxxxxxxxxx
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: Michael Rapoport <RAPOPORT@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN fs/userfaultfd.c~userfaultfd-convert-bug-to-warn_on_once fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-convert-bug-to-warn_on_once
+++ a/fs/userfaultfd.c
@@ -541,7 +541,8 @@ static unsigned int userfaultfd_poll(str
ret = POLLIN;
return ret;
default:
- BUG();
+ WARN_ON_ONCE(1);
+ return POLLERR;
}
}
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
userfaultfd-document-_ior-_iow.patch
userfaultfd-correct-comment-about-uffd_feature_pagefault_flag_wp.patch
userfaultfd-convert-bug-to-warn_on_once.patch
userfaultfd-use-vma_is_anonymous.patch
userfaultfd-non-cooperative-report-all-available-features-to-userland.patch
userfaultfd-non-cooperative-add-fork-event-build-warning-fix.patch
userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete.patch
userfaultfd-non-cooperative-avoid-madv_dontneed-race-condition.patch
userfaultfd-non-cooperative-wake-userfaults-after-uffdio_unregister.patch
userfaultfd-hugetlbfs-gup-support-vm_fault_retry.patch
userfaultfd-hugetlbfs-uffd_feature_missing_hugetlbfs.patch
userfaultfd-shmem-add-tlbflushh-header-for-microblaze.patch
userfaultfd-shmem-lock-the-page-before-adding-it-to-pagecache.patch
userfaultfd-shmem-avoid-leaking-blocks-and-used-blocks-in-uffdio_copy.patch
userfaultfd-hugetlbfs-uffd_feature_missing_shmem.patch
userfaultfd-selftest-test-uffdio_zeropage-on-all-memory-types.patch
mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock.patch
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