From: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Date: Sat,  4 Oct 2008 11:13:21 +0200

quoted text
> Please find below the revised patch set, addressing earlier review.

After patch 1:

  CC [M]  net/dccp/feat.o
net/dccp/feat.c:28: warning: ‘dccp_feat_clone_sp_val’ defined but not used

After patch 2:

  CC [M]  net/dccp/feat.o
net/dccp/feat.c:118: warning: ‘dccp_feat_clone_entry’ defined but not used
net/dccp/feat.c:139: warning: ‘dccp_feat_entry_destructor’ defined but not used

After patch 3:

  CC [M]  net/dccp/feat.o
net/dccp/feat.c:118: warning: ‘dccp_feat_clone_entry’ defined but not used
net/dccp/feat.c:157: warning: ‘dccp_feat_list_lookup’ defined but not used
net/dccp/feat.c:208: warning: ‘dccp_feat_push_change’ defined but not used
net/dccp/feat.c:255: warning: ‘dccp_push_empty_confirm’ defined but not used

After patch 4:

  CC [M]  net/dccp/feat.o
net/dccp/feat.c:157: warning: ‘dccp_feat_list_lookup’ defined but not used
net/dccp/feat.c:208: warning: ‘dccp_feat_push_change’ defined but not used
net/dccp/feat.c:255: warning: ‘dccp_push_empty_confirm’ defined but not used

And patch 5 makes no modifications to feat.c so things don't improve.

This can't happen.

You have to split up your patches more intelligently, such that they
are fully bisectable and at each patch point there are no new warnings
or known bugs added.