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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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6
arch/mips/kernel/smp.c
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@@ -537,7 +537,7 @@ void flush_tlb_mm(struct mm_struct *mm)
for_each_online_cpu(cpu) {
if (cpu != smp_processor_id() && cpu_context(cpu, mm))
cpu_context(cpu, mm) = 0;
set_cpu_context(cpu, mm, 0);
}
}
drop_mmu_context(mm);
@@ -583,7 +583,7 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned l
* mm has been completely unused by that CPU.
*/
if (cpu != smp_processor_id() && cpu_context(cpu, mm))
cpu_context(cpu, mm) = !exec;
set_cpu_context(cpu, mm, !exec);
}
}
local_flush_tlb_range(vma, start, end);
@@ -635,7 +635,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
* by that CPU.
*/
if (cpu != smp_processor_id() && cpu_context(cpu, vma->vm_mm))
cpu_context(cpu, vma->vm_mm) = 1;
set_cpu_context(cpu, vma->vm_mm, 1);
}
}
local_flush_tlb_page(vma, page);