• Alexey Dobriyan's avatar
    Detach sched.h from mm.h · e8edc6e0
    Alexey Dobriyan authored
    First thing mm.h does is including sched.h solely for can_do_mlock() inline
    function which has "current" dereference inside. By dealing with can_do_mlock()
    mm.h can be detached from sched.h which is good. See below, why.
    This patch
    a) removes unconditional inclusion of sched.h from mm.h
    b) makes can_do_mlock() normal function in mm/mlock.c
    c) exports can_do_mlock() to not break compilation
    d) adds sched.h inclusions back to files that were getting it indirectly.
    e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
       getting them indirectly
    Net result is:
    a) mm.h users would get less code to open, read, preprocess, parse, ... if
       they don't need sched.h
    b) sched.h stops being dependency for significant number of files:
       on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
       after patch it's only 3744 (-8.3%).
    Cross-compile tested on
    	all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
    	alpha alpha-up
    	i386 i386-up i386-defconfig i386-allnoconfig
    	ia64 ia64-up
    	parisc parisc-up
    	powerpc powerpc-up
    	s390 s390-up
    	sparc sparc-up
    	sparc64 sparc64-up
    	x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
    as well as my two usual configs.
    Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>