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powerpc/mm: Move pgdir setting into a helper

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Makes switch_mm_irqs_off() a bit more readable

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-07-24 14:27:58 +10:00 committed by Michael Ellerman
parent 3e23a12bca
commit 43ed84a891
1 changed files with 22 additions and 8 deletions
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30
arch/powerpc/include/asm/mmu_context.h
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@ -77,6 +77,26 @@ extern void switch_cop(struct mm_struct *next);
extern int use_cop(unsigned long acop, struct mm_struct *mm);
extern void drop_cop(unsigned long acop, struct mm_struct *mm);
#if defined(CONFIG_PPC32)
static inline void switch_mm_pgdir(struct task_struct *tsk,
struct mm_struct *mm)
{
/* 32-bit keeps track of the current PGDIR in the thread struct */
tsk->thread.pgdir = mm->pgd;
}
#elif defined(CONFIG_PPC_BOOK3E_64)
static inline void switch_mm_pgdir(struct task_struct *tsk,
struct mm_struct *mm)
{
/* 64-bit Book3E keeps track of current PGD in the PACA */
get_paca()->pgd = mm->pgd;
}
#else
static inline void switch_mm_pgdir(struct task_struct *tsk,
struct mm_struct *mm) { }
#endif
/*
* switch_mm is the entry point called from the architecture independent
* code in kernel/sched/core.c
@ -111,15 +131,9 @@ static inline void switch_mm_irqs_off(struct mm_struct *prev,
new_on_cpu = true;
}
/* 32-bit keeps track of the current PGDIR in the thread struct */
#ifdef CONFIG_PPC32
tsk->thread.pgdir = next->pgd;
#endif /* CONFIG_PPC32 */
/* Some subarchs need to track the PGD elsewhere */
switch_mm_pgdir(tsk, next);
/* 64-bit Book3E keeps track of current PGD in the PACA */
#ifdef CONFIG_PPC_BOOK3E_64
get_paca()->pgd = next->pgd;
#endif
/* Nothing else to do if we aren't actually switching */
if (prev == next)
return;