Re: [PATCH v3 20/23] fs: Allow copy_mount_options() to access user-space in a single pass

Al Viro
2020-04-21T15:30:02Z

On Tue, Apr 21, 2020 at 03:26:00PM +0100, Catalin Marinas wrote:

> While this function is not on a critical path, the single-pass behaviour
> is required for arm64 MTE (memory tagging) support where a uaccess can
> trigger intra-page faults (tag not matching). With the current
> implementation, if this happens during the first page, the function will
> return -EFAULT.

Details, please.