The patch titled
Subject: userfaultfd: report actual registered features in fdinfo
has been added to the -mm tree. Its filename is
userfaultfd-report-actual-registered-features-in-fdinfo.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-report-actual-registered-features-in-fdinfo.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-report-actual-registered-features-in-fdinfo.patch
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------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Subject: userfaultfd: report actual registered features in fdinfo
fdinfo for userfault file descriptor reports UFFD_API_FEATURES. Up until
recently, the UFFD_API_FEATURES was defined as 0, therefore corresponding
field in fdinfo always contained zero. Now, with introduction of several
additional features, UFFD_API_FEATURES is not longer 0 and it seems better
to report actual features requested for the userfaultfd object described
by the fdinfo. First, the applications that were using userfault will
still see zero at the features field in fdinfo. Next, reporting actual
features rather than available features, gives clear indication of what
userfault features are used by an application.
Link: http://lkml.kernel.org/r/1491140181-22121-1-git-send-email-rppt@xxxxxxxxxxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN fs/userfaultfd.c~userfaultfd-report-actual-registered-features-in-fdinfo fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-report-actual-registered-features-in-fdinfo
+++ a/fs/userfaultfd.c
@@ -1756,7 +1756,7 @@ static void userfaultfd_show_fdinfo(stru
* protocols: aa:... bb:...
*/
seq_printf(m, "pending:\t%lu\ntotal:\t%lu\nAPI:\t%Lx:%x:%Lx\n",
- pending, total, UFFD_API, UFFD_API_FEATURES,
+ pending, total, UFFD_API, ctx->features,
UFFD_API_IOCTLS|UFFD_API_RANGE_IOCTLS);
}
#endif
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxxxxxxx are
userfaultfd-report-actual-registered-features-in-fdinfo.patch
userfaultfd-selftest-combine-all-cases-into-the-single-executable.patch
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