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[smart] feat: add unmap for null mapper #9186

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Merged
BernardXiong merged 1 commit into from
Jul 16, 2024
Merged

[smart] feat: add unmap for null mapper #9186

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18 changes: 18 additions & 0 deletions components/lwp/lwp_user_mm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -70,11 +70,29 @@ static void _null_page_fault(struct rt_varea *varea,

static rt_err_t _null_shrink(rt_varea_t varea, void *new_start, rt_size_t size)
{
char *varea_start = varea->start;
void *rm_start;
void *rm_end;

if (varea_start == (char *)new_start)
{
rm_start = varea_start + size;
rm_end = varea_start + varea->size;
}
else /* if (varea_start < (char *)new_start) */
{
RT_ASSERT(varea_start < (char *)new_start);
rm_start = varea_start;
rm_end = new_start;
}

rt_varea_unmap_range(varea, rm_start, rm_end - rm_start);
return RT_EOK;
}

static rt_err_t _null_split(struct rt_varea *existed, void *unmap_start, rt_size_t unmap_len, struct rt_varea *subset)
{
rt_varea_unmap_range(existed, unmap_start, unmap_len);
return RT_EOK;
}

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