[HOWTO] set extra_cflags to indicate compilation against -mm kernels

From: Michael Krufky
Date: Sat Jul 30 2005 - 16:30:43 EST

With the addition of topdir-mm.patch into the -mm tree (since 2.6.13-rc3-mm2), it is now possible for Makefile to detect whether a cvs subtree is being built against -mm or not... -mm kernels now have a .mm file in the top level directory.

inside Makefile:

mm-kernel := $(TOPDIR)/.mm
ifneq ($(mm-kernel),)
MM_KERNEL_CFLAGS := -DMM_KERNEL=$(shell cat $(mm-kernel) 2> /dev/null)

inside C files:
#ifdef MM_KERNEL
/* code needed by -mm kernel only */
/* original code for compilation against -linus */

This should probably be documented somewhere, but I don't know where it goes.......

Michael Krufky

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