On Tue, Mar 13 2018, Arnd Bergmann wrote:
> One of Neil's recent cleanups apparently has led the code to get
> to a state where gcc tracks the 'seqnr' variable just enough to
> see that it is sometimes initialized in seq_client_alloc_seq(),
> but not enough that it can prove this initialization to be reliable
> before the use of that variable:
>
> drivers/staging/lustre/lustre/fid/fid_request.c: In function 'seq_client_alloc_fid':
> drivers/staging/lustre/lustre/fid/fid_request.c:245:22: error: 'seqnr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> The code seems to be otherwise correct, and I could not come
> up with a good way to simplify it further, so this adds a fake
> initialization to shut up that warning.
We could possibly have seq_client_alloc_seq return the seqnr,
or U64_MAX+rc.
Then if (seqnr >= U64MAX-MAX_ERRNO) there is an error.
I'm not sure that is actually an improvement though, and I'm happy with
your approach
Reviewed-by: NeilBrown <neilb@xxxxxxxx>
Thanks,
NeilBrown
>
> Cc: NeilBrown <neilb@xxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/staging/lustre/lustre/fid/fid_request.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/staging/lustre/lustre/fid/fid_request.c b/drivers/staging/lustre/lustre/fid/fid_request.c
> index fa23423eb8b3..030680f37c79 100644
> --- a/drivers/staging/lustre/lustre/fid/fid_request.c
> +++ b/drivers/staging/lustre/lustre/fid/fid_request.c
> @@ -174,6 +174,7 @@ static int seq_client_alloc_seq(const struct lu_env *env,
> if (rc) {
> CERROR("%s: Can't allocate new meta-sequence, rc %d\n",
> seq->lcs_name, rc);
> + *seqnr = U64_MAX;
> return rc;
> }
> CDEBUG(D_INFO, "%s: New range - " DRANGE "\n",
> --
> 2.9.0
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