>>> Sasha Levin <[email protected]> schrieb am 16.11.2019 um 16:38 in Nachricht
<[email protected]>:
> From: Nathan Chancellor <[email protected]>
>
> [ Upstream commit 20054597f169090109fc3f0dfa1a48583f4178a4 ]
>
> Clang warns when one enumerated type is implicitly converted to another.
IMHO even an explicit cast doesn't make it better: Either it's the same enum,
or it's a different one.
The only clean solution IMHO would be a converter function like
enum out convert_enum_in(enum in i)
{
switch (i)
{
case enum_in_1: return enum_out_1; break;
case enum_in_2: return enum_out_2; break;
...
default: bad_value(i);
}
}
Maybe a clever compiler can make this (almost) a no-op, but it should be clear
that assigning different enums to each other is a bad idea.
>
> drivers/scsi/iscsi_tcp.c:803:15: warning: implicit conversion from
> enumeration type 'enum iscsi_host_param' to different enumeration type
> 'enum iscsi_param' [-Wenum-conversion]
> &addr, param, buf);
> ^~~~~
> 1 warning generated.
>
> iscsi_conn_get_addr_param handles ISCSI_HOST_PARAM_IPADDRESS just fine
> so add an explicit cast to iscsi_param to make it clear to Clang that
> this is expected behavior.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/153
> Signed-off-by: Nathan Chancellor <[email protected]>
> Reviewed-by: Nick Desaulniers <[email protected]>
> Signed-off-by: Martin K. Petersen <[email protected]>
> Signed-off-by: Sasha Levin <[email protected]>
> ---
> drivers/scsi/iscsi_tcp.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
> index b025a0b743417..23354f206533b 100644
> --- a/drivers/scsi/iscsi_tcp.c
> +++ b/drivers/scsi/iscsi_tcp.c
> @@ -800,7 +800,8 @@ static int iscsi_sw_tcp_host_get_param(struct Scsi_Host
> *shost,
> return rc;
>
> return iscsi_conn_get_addr_param((struct sockaddr_storage *)
> - &addr, param, buf);
> + &addr,
> + (enum iscsi_param)param, buf);
> default:
> return iscsi_host_get_param(shost, param, buf);
> }
> --
> 2.20.1
>
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> kernel.org.
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