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[ Upstream commitf044561331] commit4eb3117888changed the cache= option to accept either string shortcuts or bitfield values. It also changed /proc/mounts to emit the option as the hexadecimal numeric value rather than the shortcut string. However, by printing "cache=%x" without the leading 0x, shortcuts such as "cache=loose" will emit "cache=f" and 'f' is not a string that is parseable by kstrtoint(), so remounting may fail if a remount with "cache=f" is attempted. debug=%x has had the same problem since options have been displayed inc4fac91004("9p: Implement show_options") Fix these by adding the 0x prefix to the hexadecimal value shown in /proc/mounts. Fixes:4eb3117888("fs/9p: Rework cache modes and add new options to Documentation") Signed-off-by: Eric Sandeen <sandeen@redhat.com> Message-ID: <54b93378-dcf1-4b04-922d-c8b4393da299@redhat.com> [Dominique: use %#x at Al Viro's suggestion, also handle debug] Tested-by: Remi Pommarel <repk@triplefau.lt> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Sasha Levin <sashal@kernel.org>