On 07/01/2026 09:40, John Garry wrote:
A friendly reminder on this one.
Thanks
> This series aims to remedy an issue that not all per-arch versions of
> cpumask_of_node() are robust against NUMA_NO_NODE.
>
> In my view, cpumask_of_node() should be able to handle NUMA_NO_NODE. This
> is because NUMA_NO_NODE is a valid index from the following flow, where
> the device NUMA node is not set (from default):
>
> device_initialize(dev)
> set_dev_node(dev, NUMA_NO_NODE);
>
> mask = cpumask_of_node(dev_to_node(dev));
>
> The CONFIG_DEBUG_PER_CPU_MAPS=n x86 version cpumask_of_node() would
> produce an array out-of-index issue (when passed NUMA_NO_NODE), which I
> think is attempted to be worked around here:
> https://lore.kernel.org/linux-scsi/cf0f9085-6c87-4dd5-9114-925723e68495@oracle.com/T/#mdedb68052e419b4bfca9ce45bb33b58988018945
>
> I also see a CVE which also looks related:
> https://nvd.nist.gov/vuln/detail/cve-2024-39277
>
> Each per-arch version could be picked up separately, as can the
> asm-generic change.
>
> Differences to v1:
> - Put mips and loongarch definition on a single line (Huacai)
>
> John Garry (4):
> include/asm-generic/topology.h: Remove unused definition of
> cpumask_of_node()
> LoongArch: Make cpumask_of_node() robust against NUMA_NO_NODE
> MIPS: Loongson: Make cpumask_of_node() robust against NUMA_NO_NODE
> x86/cpu/topology: Make cpumask_of_node() robust against NUMA_NO_NODE
>
> arch/loongarch/include/asm/topology.h | 2 +-
> arch/mips/include/asm/mach-loongson64/topology.h | 2 +-
> arch/x86/include/asm/topology.h | 2 ++
> arch/x86/mm/numa.c | 2 ++
> include/asm-generic/topology.h | 8 ++------
> 5 files changed, 8 insertions(+), 8 deletions(-)
>