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

From: Michael Krufky (mkrufky_at_m1k.net)
Date: 07/30/05

  • Next message: Hugh Dickins: "Re: revert yenta free_irq on suspend" 
    Date:	Sat, 30 Jul 2005 17:29:21 -0400
To: LKML <linux-kernel@vger.kernel.org>

    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 $(mm-kernel) 2> /dev/null)
    ifneq ($(MM_KERNEL_CFLAGS),-DMM_KERNEL=)
    EXTRA_CFLAGS += $(MM_KERNEL_CFLAGS)
    endif
    endif

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

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

    -- 
Michael Krufky
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  • Next message: Hugh Dickins: "Re: revert yenta free_irq on suspend"