This is a note to let you know that I've just added the patch titled

mm/sparse.c: wrong allocation for mem_section

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mm-sparse.c-wrong-allocation-for-mem_section.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From d09cfbbfa0f761a97687828b5afb27b56cbf2e19 Mon Sep 17 00:00:00 2001

From: Baoquan He bhe@redhat.com Date: Thu, 4 Jan 2018 16:18:06 -0800 Subject: mm/sparse.c: wrong allocation for mem_section

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); }

Patches currently in stable-queue which might be from bhe@redhat.com are

queue-4.14/mm-sparse.c-wrong-allocation-for-mem_section.patch