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Zach O'Keefe 3505c8e62a selftests/vm: retry on EAGAIN for MADV_COLLAPSE selftest 
MADV_COLLAPSE is a best-effort request that will set errno to an
actionable value if the request cannot be performed.

For example, if pages are not found on the LRU, or if they are currently
locked by something else, MADV_COLLAPSE will fail and set errno to EAGAIN
to inform callers that they may try again.

Since the khugepaged selftest is the first public use of MADV_COLLAPSE,
set a best practice of checking errno and retrying on EAGAIN.

Link: https://lkml.kernel.org/r/20220922184651.1016461-2-zokeefe@google.com
Fixes: 9330694de5 ("selftests/vm: add MADV_COLLAPSE collapse context to selftests")
Signed-off-by: Zach O'Keefe <zokeefe@google.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Chris Kennelly <ckennelly@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: James Houghton <jthoughton@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rongwei Wang <rongwei.wang@linux.alibaba.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 		2022-10-03 14:03:33 -07:00
..
crypto/chacha20-s390 tools/testing/crypto: Use vzalloc instead of vmalloc+memset 2022-07-05 14:46:36 +02:00
cxl cxl/hdm: Commit decoder state to hardware 2022-07-25 12:18:07 -07:00
fault-injection
…
ktest
…
kunit kunit: tool: Enable virtio/PCI by default on UML 2022-07-08 11:22:29 -06:00
memblock memblock tests: add new pageblock related macro 2022-10-03 14:03:04 -07:00
nvdimm dax: introduce DAX_RECOVERY_WRITE dax access mode 2022-05-16 13:35:56 -07:00
radix-tree lib/test_maple_tree: add testing for maple tree 2022-09-26 19:46:14 -07:00
scatterlist tools/testing/scatterlist: add missing defines 2022-01-30 09:56:58 +02:00
selftests selftests/vm: retry on EAGAIN for MADV_COLLAPSE selftest 2022-10-03 14:03:33 -07:00
vsock af_vsock: SOCK_SEQPACKET broken buffer test 2022-03-18 15:13:19 +00:00