2005-04-17 06:20:36 +08:00
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#ifndef __PARISC_MMU_CONTEXT_H
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#define __PARISC_MMU_CONTEXT_H
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#include <linux/mm.h>
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Detach sched.h from mm.h
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
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-21 05:22:52 +08:00
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#include <linux/sched.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/atomic.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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2007-05-03 01:27:14 +08:00
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#include <asm-generic/mm_hooks.h>
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2005-04-17 06:20:36 +08:00
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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/* on PA-RISC, we actually have enough contexts to justify an allocator
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* for them. prumpf */
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extern unsigned long alloc_sid(void);
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extern void free_sid(unsigned long);
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static inline int
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init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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{
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BUG_ON(atomic_read(&mm->mm_users) != 1);
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mm->context = alloc_sid();
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return 0;
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}
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static inline void
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destroy_context(struct mm_struct *mm)
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{
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free_sid(mm->context);
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mm->context = 0;
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}
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static inline void load_context(mm_context_t context)
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{
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mtsp(context, 3);
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#if SPACEID_SHIFT == 0
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mtctl(context << 1,8);
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#else
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mtctl(context >> (SPACEID_SHIFT - 1),8);
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#endif
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
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{
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if (prev != next) {
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mtctl(__pa(next->pgd), 25);
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load_context(next->context);
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}
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}
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#define deactivate_mm(tsk,mm) do { } while (0)
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static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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/*
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* Activate_mm is our one chance to allocate a space id
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* for a new mm created in the exec path. There's also
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* some lazy tlb stuff, which is currently dead code, but
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* we only allocate a space id if one hasn't been allocated
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* already, so we should be OK.
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*/
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BUG_ON(next == &init_mm); /* Should never happen */
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if (next->context == 0)
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next->context = alloc_sid();
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switch_mm(prev,next,current);
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}
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#endif
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