About kernel patches

[曾兴胜]

Hi,
     I am a newer of ubuntu. I want to get kernel patches of ubuntu 12.04 release or upstream kernel 3.9.0, but I cannot find them through I reviewed  https://wiki.ubuntu.com/Kernel. Can you tell me where or how I can get kernel patches? 
     Thanks! Looking forward to your reply.
      Best regards.
     
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