Among Linux kernel developers, the -mm tree used to refer to a version of the kernel source code maintained by Andrew Morton.

The -mm kernel tree used to fill the role of Linux kernel development builds, formerly identified by odd minor version numbers (see this section on Linux kernel version numbering). New and experimental code used to find its way into a 2.6.x-mm kernel build. Historically the -mm tree focused on new developments for the memory management part of the kernel (mm).

Occasionally, the -mm tree was overloaded with new patches so testing it became overly difficult. On Sep 17 2007 Andrew Morton sent a mail saying that "this just isn't working any more".

Today the -mm tree is no longer being developed and has been superseded by the -next tree.

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