mm/hugetlb: avoid hardcoding while checking if cma is enabled
hugetlb_cma[0] can be NULL due to various reasons, for example, node0 has no memory. so NULL hugetlb_cma[0] doesn't necessarily mean cma is not enabled. gigantic pages might have been reserved on other nodes. This patch fixes possible double reservation and CMA leak. [akpm@linux-foundation.org: fix CONFIG_CMA=n warning] [sfr@canb.auug.org.au: better checks before using hugetlb_cma] Link: http://lkml.kernel.org/r/20200721205716.6dbaa56b@canb.auug.org.au Fixes: cf11e85f ("mm: hugetlb: optionally allocate gigantic hugepages using cma") Signed-off-by:Barry Song <song.bao.hua@hisilicon.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Acked-by:
Roman Gushchin <guro@fb.com> Cc: Jonathan Cameron <jonathan.cameron@huawei.com> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/r/20200710005726.36068-1-song.bao.hua@hisilicon.com Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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