Messages in this thread |  | | | Date | Thu, 03 Dec 2009 10:15:17 +0800 | | From | Li Zefan <> | | Subject | Re: [PATCH 22/24] HWPOISON: add memory cgroup filter |
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> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP > +u32 hwpoison_filter_memcg; > +static int hwpoison_filter_task(struct page *p) > +{ > + struct mem_cgroup *mem; > + struct cgroup_subsys_state *css; > + > + if (!hwpoison_filter_memcg) > + return 0; > + > + mem = try_get_mem_cgroup_from_page(p); > + if (!mem) > + return -EINVAL; > + > + css = mem_cgroup_css(mem); > + if (!css) > + return -EINVAL; > +
Here, if mem != NULL, then css won't be NULL.
> + css_put(css); > + return 0; > +}
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