kmemleak: Annotate false positive in init_section_page_cgroup()
The pointer to the page_cgroup table allocated in init_section_page_cgroup() is stored in section->page_cgroup as (base - pfn). Since this value does not point to the beginning or inside the allocated memory block, kmemleak reports a false positive. This was reported in bugzilla.kernel.org as #16297. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Adrien Dessemond <adrien.dessemond@gmail.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Andrew Morton <akpm@linux-foundation.org>
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@ -9,6 +9,7 @@
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#include <linux/vmalloc.h>
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#include <linux/cgroup.h>
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#include <linux/swapops.h>
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#include <linux/kmemleak.h>
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static void __meminit
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__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
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@ -126,6 +127,12 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn)
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if (!base)
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base = vmalloc(table_size);
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}
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/*
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* The value stored in section->page_cgroup is (base - pfn)
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* and it does not point to the memory block allocated above,
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* causing kmemleak false positives.
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*/
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kmemleak_not_leak(base);
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} else {
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/*
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* We don't have to allocate page_cgroup again, but
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