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

mm/sparsemem: Fix ARM64 boot crash when CONFIG_SPARSEMEM_EXTREME=y

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-sparsemem-fix-arm64-boot-crash-when-config_sparsemem_extreme-y.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 629a359bdb0e0652a8227b4ff3125431995fec6e Mon Sep 17 00:00:00 2001

From: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Date: Tue, 7 Nov 2017 11:33:37 +0300 Subject: mm/sparsemem: Fix ARM64 boot crash when CONFIG_SPARSEMEM_EXTREME=y

From: Kirill A. Shutemov kirill.shutemov@linux.intel.com

commit 629a359bdb0e0652a8227b4ff3125431995fec6e upstream.

Since commit:

83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")

we allocate the mem_section array dynamically in sparse_memory_present_with_active_regions(), but some architectures, like arm64, don't call the routine to initialize sparsemem.

Let's move the initialization into memory_present() it should cover all architectures.

Reported-and-tested-by: Sudeep Holla sudeep.holla@arm.com Tested-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com Acked-by: Will Deacon will.deacon@arm.com Cc: Andrew Morton akpm@linux-foundation.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: linux-mm@kvack.org Fixes: 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y") Link: http://lkml.kernel.org/r/20171107083337.89952-1-kirill.shutemov@linux.intel.... Signed-off-by: Ingo Molnar mingo@kernel.org Cc: Dan Rue dan.rue@linaro.org Cc: Naresh Kamboju naresh.kamboju@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- mm/page_alloc.c | 10 ---------- mm/sparse.c | 10 ++++++++++ 2 files changed, 10 insertions(+), 10 deletions(-)

--- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5651,16 +5651,6 @@ void __init sparse_memory_present_with_a unsigned long start_pfn, end_pfn; int i, this_nid;

-#ifdef CONFIG_SPARSEMEM_EXTREME - if (!mem_section) { - unsigned long size, align; - - size = sizeof(struct mem_section) * NR_SECTION_ROOTS; - align = 1 << (INTERNODE_CACHE_SHIFT); - mem_section = memblock_virt_alloc(size, align); - } -#endif - for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) memory_present(this_nid, start_pfn, end_pfn); } --- a/mm/sparse.c +++ b/mm/sparse.c @@ -207,6 +207,16 @@ void __init memory_present(int nid, unsi { unsigned long pfn;

+#ifdef CONFIG_SPARSEMEM_EXTREME + if (unlikely(!mem_section)) { + unsigned long size, align; + + size = sizeof(struct mem_section) * NR_SECTION_ROOTS; + align = 1 << (INTERNODE_CACHE_SHIFT); + mem_section = memblock_virt_alloc(size, align); + } +#endif + start &= PAGE_SECTION_MASK; mminit_validate_memmodel_limits(&start, &end); for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {

Patches currently in stable-queue which might be from kirill.shutemov@linux.intel.com are

queue-4.14/mm-sparsemem-fix-arm64-boot-crash-when-config_sparsemem_extreme-y.patch queue-4.14/x86-xen-provide-pre-built-page-tables-only-for-config_xen_pv-y-and-config_xen_pvh-y.patch queue-4.14/x86-xen-drop-5-level-paging-support-code-from-the-xen_pv-code.patch queue-4.14/x86-kasan-use-the-same-shadow-offset-for-4-and-5-level-paging.patch queue-4.14/mm-sparsemem-allocate-mem_section-at-runtime-for-config_sparsemem_extreme-y.patch queue-4.14/x86-mm-relocate-page-fault-error-codes-to-traps.h.patch