Tim Gardner <tim.gard...@canonical.com> wrote:
>pfn cannot actually be used unless (!info->feature_persistent), nor is
>pfn accessed in get_grant() unless (!info->feature_persistent), but
>silence
>this warning anyway. gcc-4.8
>
>drivers/block/xen-blkfront.c: In function 'do_blkif_request':
>drivers/block/xen-blkfront.c:508:20: warning: 'pfn' may be used
>uninitialized in this function [-Wmaybe-uninitialized]
> gnt_list_entry = get_grant(&gref_head, pfn, info);
> ^
>drivers/block/xen-blkfront.c:492:19: note: 'pfn' was declared here
> unsigned long pfn;
>
>Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
>Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
>Cc: David Vrabel <david.vra...@citrix.com>
>Signed-off-by: Tim Gardner <tim.gard...@canonical.com>
>---
> drivers/block/xen-blkfront.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/block/xen-blkfront.c
>b/drivers/block/xen-blkfront.c
>index 432db1b..5f926de 100644
>--- a/drivers/block/xen-blkfront.c
>+++ b/drivers/block/xen-blkfront.c
>@@ -489,7 +489,7 @@ static int blkif_queue_request(struct request *req)
>
> if ((ring_req->operation == BLKIF_OP_INDIRECT) &&
> (i % SEGS_PER_INDIRECT_FRAME == 0)) {
>- unsigned long pfn;
>+ unsigned long uninitialized_var(pfn);
>
> if (segments)
> kunmap_atomic(segments);
I have a similar patch from Roger that sets pfn=0.
Roger could you repost your patch please or if you feel that this patch makes
sense then comment on it?
Thanks.
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