4.14-stable review patch. If anyone has any objections, please let me know.
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From: Baoquan He bhe@redhat.com
commit d09cfbbfa0f761a97687828b5afb27b56cbf2e19 upstream.
In commit 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y") mem_section is allocated at runtime to save memory.
It allocates the first dimension of array with sizeof(struct mem_section).
It costs extra memory, should be sizeof(struct mem_section *).
Fix it.
Link: http://lkml.kernel.org/r/1513932498-20350-1-git-send-email-bhe@redhat.com Fixes: 83e3c48729 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y") Signed-off-by: Baoquan He bhe@redhat.com Tested-by: Dave Young dyoung@redhat.com Acked-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com Cc: Kirill A. Shutemov kirill.shutemov@linux.intel.com Cc: Ingo Molnar mingo@kernel.org Cc: Andy Lutomirski luto@amacapital.net Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Atsushi Kumagai ats-kumagai@wm.jp.nec.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- mm/sparse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/sparse.c +++ b/mm/sparse.c @@ -211,7 +211,7 @@ void __init memory_present(int nid, unsi if (unlikely(!mem_section)) { unsigned long size, align;
- size = sizeof(struct mem_section) * NR_SECTION_ROOTS; + size = sizeof(struct mem_section*) * NR_SECTION_ROOTS; align = 1 << (INTERNODE_CACHE_SHIFT); mem_section = memblock_virt_alloc(size, align); }