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MIPS: mm: Add set_cpu_context() for ASID assignments

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When we gain MMID support we'll be storing MMIDs as atomic64_t values
and accessing them via atomic64_* functions. This necessitates that we
don't use cpu_context() as the left hand side of an assignment, ie. as a
modifiable lvalue. In preparation for this introduce a new
set_cpu_context() function & replace all assignments with cpu_context()
on their left hand side with an equivalent call to set_cpu_context().

To enforce that cpu_context() should not be used for assignments, we
rewrite it as a static inline function.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
This commit is contained in:
Paul Burton
2019-02-02 01:43:25 +00:00
parent 42d5b84657
commit 0b317c389c
5 changed files with 24 additions and 13 deletions
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16
arch/mips/include/asm/mmu_context.h
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@@ -88,7 +88,17 @@ static inline u64 asid_first_version(unsigned int cpu)
return ~asid_version_mask(cpu) + 1;
}
#define cpu_context(cpu, mm) ((mm)->context.asid[cpu])
static inline u64 cpu_context(unsigned int cpu, const struct mm_struct *mm)
{
return mm->context.asid[cpu];
}
static inline void set_cpu_context(unsigned int cpu,
struct mm_struct *mm, u64 ctx)
{
mm->context.asid[cpu] = ctx;
}
#define asid_cache(cpu) (cpu_data[cpu].asid_cache)
#define cpu_asid(cpu, mm) \
(cpu_context((cpu), (mm)) & cpu_asid_mask(&cpu_data[cpu]))
@@ -111,7 +121,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
int i;
for_each_possible_cpu(i)
cpu_context(i, mm) = 0;
set_cpu_context(i, mm, 0);
mm->context.bd_emupage_allocmap = NULL;
spin_lock_init(&mm->context.bd_emupage_lock);
@@ -175,7 +185,7 @@ drop_mmu_context(struct mm_struct *mm)
htw_start();
} else {
/* will get a new context next time */
cpu_context(cpu, mm) = 0;
set_cpu_context(cpu, mm, 0);
}
local_irq_restore(flags);