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SubjectRe: [PATCH] add check do_direct_IO() return val
> If you are sure the problem is caused by EFAULT or ENOMEM , why not:

To this issue(wengang have posted the background), I hit it for
do_direct_IO() return EFAULT caused the panic, however, the function
not only return these critical errors, maybe other error return like
EIO.

Thanks,
Joe
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