I disagree: you fix debian code but upstream kernel is also affected.
I wanted to compile the upstream 4.4.26 for the COW fixe and cannot.
Please revert.
$ rmadison linux
linux | 4.5.5-1 | unstable | source
linux | 4.5.5-1 | unstable-debug | source
linux | 4.6.4-1 | unstable | source
linux | 4.6.4-1 | unstable-debug | source
linux | 4.7.5-1~bpo8+2 | jessie-backports | source
linux | 4.7.5-1 | unstable | source
linux | 4.7.6-1 | testing | source
linux | 4.7.8-1~bpo8+1 | buildd-jessie-backports | source
linux | 4.7.8-1~bpo8+1 | jessie-backports | source
linux | 4.7.8-1 | buildd-unstable | source
linux | 4.7.8-1 | unstable | source
linux | 4.7.8-1 | unstable-debug | source
You should be noted that building kernel from vanilla source isn't
good idea in Debian.