r1646 merge:
the simple expression has the same precision without overflow
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@ -111,10 +111,7 @@ ngx_slab_init(ngx_slab_pool_t *pool)
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p += n * sizeof(ngx_slab_page_t);
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/* STUB: possible overflow on 64-bit platform */
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pages = (ngx_uint_t) ((uint64_t) size * ngx_pagesize
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/ (ngx_pagesize + sizeof(ngx_slab_page_t))
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/ ngx_pagesize);
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pages = (ngx_uint_t) (size / (ngx_pagesize + sizeof(ngx_slab_page_t)));
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ngx_memzero(p, pages * sizeof(ngx_slab_page_t));
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