mm/filemap.c: enable error injection at add_to_page_cache()
Recently I messed up the error handling in filemap_fault() because of an unexpected ENOMEM (related to cgroup memory limits) in add_to_page_cache. Enable error injection at this point so I can add a testcase to xfstests to verify I don't mess this up again. [akpm@linux-foundation.org: include linux/error-injection.h] Link: http://lkml.kernel.org/r/20190403152604.14008-1-josef@toxicpanda.comSigned-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NWilliam Kucharski <william.kucharski@oracle.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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