diff options
author | Lorenzo Stoakes <lstoakes@gmail.com> | 2023-10-03 00:14:53 +0100 |
---|---|---|
committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-18 14:34:15 -0700 |
commit | 9c4b21422507035f3e0a507a680c9b03c0bcc730 (patch) | |
tree | 586a876d05bf8fe1306dccf437f5fec149aa95de /kernel/events | |
parent | 0f20bba1688bdf3b32df0162511a67d4eda15790 (diff) | |
download | linux-9c4b21422507035f3e0a507a680c9b03c0bcc730.tar.gz linux-9c4b21422507035f3e0a507a680c9b03c0bcc730.tar.bz2 linux-9c4b21422507035f3e0a507a680c9b03c0bcc730.zip |
mm/gup: make failure to pin an error if FOLL_NOWAIT not specified
There really should be no circumstances under which a non-FOLL_NOWAIT GUP
operation fails to return any pages, so make this an error and warn on it.
To catch the trivial case, simply exit early if nr_pages == 0.
This brings __get_user_pages_locked() in line with the behaviour of its
nommu variant.
Link: https://lkml.kernel.org/r/2a42d96dd1e37163f90a0019a541163dafb7e4c3.1696288092.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/events')
0 files changed, 0 insertions, 0 deletions