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Message-ID: <d748aae4-4d48-6f8a-2f6d-67fad5224ba9@huawei.com>
Date: Tue, 17 Sep 2019 14:20:11 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Michael Ellerman <mpe@...erman.id.au>, <catalin.marinas@....com>,
<will@...nel.org>, <mingo@...hat.com>, <bp@...en8.de>,
<rth@...ddle.net>, <ink@...assic.park.msu.ru>,
<mattst88@...il.com>, <benh@...nel.crashing.org>,
<paulus@...ba.org>, <heiko.carstens@...ibm.com>,
<gor@...ux.ibm.com>, <borntraeger@...ibm.com>,
<ysato@...rs.sourceforge.jp>, <dalias@...c.org>,
<davem@...emloft.net>, <ralf@...ux-mips.org>,
<paul.burton@...s.com>, <jhogan@...nel.org>,
<jiaxun.yang@...goat.com>, <chenhc@...ote.com>
CC: <akpm@...ux-foundation.org>, <rppt@...ux.ibm.com>,
<anshuman.khandual@....com>, <tglx@...utronix.de>, <cai@....pw>,
<robin.murphy@....com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <hpa@...or.com>, <x86@...nel.org>,
<dave.hansen@...ux.intel.com>, <luto@...nel.org>,
<peterz@...radead.org>, <len.brown@...el.com>, <axboe@...nel.dk>,
<dledford@...hat.com>, <jeffrey.t.kirsher@...el.com>,
<linux-alpha@...r.kernel.org>, <naveen.n.rao@...ux.vnet.ibm.com>,
<mwb@...ux.vnet.ibm.com>, <linuxppc-dev@...ts.ozlabs.org>,
<linux-s390@...r.kernel.org>, <linux-sh@...r.kernel.org>,
<sparclinux@...r.kernel.org>, <tbogendoerfer@...e.de>,
<linux-mips@...r.kernel.org>, <rafael@...nel.org>,
<mhocko@...nel.org>, <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v5] numa: make node_to_cpumask_map() NUMA_NO_NODE aware
On 2019/9/17 13:28, Michael Ellerman wrote:
> Yunsheng Lin <linyunsheng@...wei.com> writes:
>> When passing the return value of dev_to_node() to cpumask_of_node()
>> without checking if the device's node id is NUMA_NO_NODE, there is
>> global-out-of-bounds detected by KASAN.
>>
>> From the discussion [1], NUMA_NO_NODE really means no node affinity,
>> which also means all cpus should be usable. So the cpumask_of_node()
>> should always return all cpus online when user passes the node id as
>> NUMA_NO_NODE, just like similar semantic that page allocator handles
>> NUMA_NO_NODE.
>>
>> But we cannot really copy the page allocator logic. Simply because the
>> page allocator doesn't enforce the near node affinity. It just picks it
>> up as a preferred node but then it is free to fallback to any other numa
>> node. This is not the case here and node_to_cpumask_map will only restrict
>> to the particular node's cpus which would have really non deterministic
>> behavior depending on where the code is executed. So in fact we really
>> want to return cpu_online_mask for NUMA_NO_NODE.
>>
>> Some arches were already NUMA_NO_NODE aware, but they return cpu_all_mask,
>> which should be identical with cpu_online_mask when those arches do not
>> support cpu hotplug, this patch also changes them to return cpu_online_mask
>> in order to be consistent and use NUMA_NO_NODE instead of "-1".
>
> Except some of those arches *do* support CPU hotplug, powerpc and sparc
> at least. So switching from cpu_all_mask to cpu_online_mask is a
> meaningful change.
Yes, thanks for pointing out.
>
> That doesn't mean it's wrong, but you need to explain why it's the right
> change.
How about adding the below to the commit log:
Even if some of the arches do support CPU hotplug, it does not make sense
to return the cpu that has been hotplugged.
Any suggestion?
>
>
>> Also there is a debugging version of node_to_cpumask_map() for x86 and
>> arm64, which is only used when CONFIG_DEBUG_PER_CPU_MAPS is defined, this
>> patch changes it to handle NUMA_NO_NODE as normal node_to_cpumask_map().
>>
>> [1] https://lore.kernel.org/patchwork/patch/1125789/
>> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
>> Suggested-by: Michal Hocko <mhocko@...nel.org>
>> Acked-by: Michal Hocko <mhocko@...e.com>
>> ---
>> V5: Drop unsigned "fix" change for x86/arm64, and change comment log
>> according to Michal's comment.
>> V4: Have all these changes in a single patch.
>
> This makes it much harder to get the patch merged, you basically have to
> get Andrew Morton to merge it now. Sending individual patches for each
> arch means each arch maintainer can merge them separately.
I am new to the arch change here, and not sure which is the best way to get
the multi-arches change merged.
Do you think it is better to resend this as individual patches for each arch
after megre window?
thanks for reviewing.
>
> cheers
>
>> V3: Change to only handle NUMA_NO_NODE, and return cpu_online_mask
>> for NUMA_NO_NODE case, and change the commit log to better justify
>> the change.
>> V2: make the node id checking change to other arches too.
>> ---
>> arch/alpha/include/asm/topology.h | 2 +-
>> arch/arm64/include/asm/numa.h | 3 +++
>> arch/arm64/mm/numa.c | 3 +++
>> arch/mips/include/asm/mach-ip27/topology.h | 4 ++--
>> arch/mips/include/asm/mach-loongson64/topology.h | 4 +++-
>> arch/powerpc/include/asm/topology.h | 6 +++---
>> arch/s390/include/asm/topology.h | 3 +++
>> arch/sparc/include/asm/topology_64.h | 6 +++---
>> arch/x86/include/asm/topology.h | 3 +++
>> arch/x86/mm/numa.c | 3 +++
>> 10 files changed, 27 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/alpha/include/asm/topology.h b/arch/alpha/include/asm/topology.h
>> index 5a77a40..836c9e2 100644
>> --- a/arch/alpha/include/asm/topology.h
>> +++ b/arch/alpha/include/asm/topology.h
>> @@ -31,7 +31,7 @@ static const struct cpumask *cpumask_of_node(int node)
>> int cpu;
>>
>> if (node == NUMA_NO_NODE)
>> - return cpu_all_mask;
>> + return cpu_online_mask;
>>
>> cpumask_clear(&node_to_cpumask_map[node]);
>>
>> diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h
>> index 626ad01..c8a4b31 100644
>> --- a/arch/arm64/include/asm/numa.h
>> +++ b/arch/arm64/include/asm/numa.h
>> @@ -25,6 +25,9 @@ const struct cpumask *cpumask_of_node(int node);
>> /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
>> static inline const struct cpumask *cpumask_of_node(int node)
>> {
>> + if (node == NUMA_NO_NODE)
>> + return cpu_online_mask;
>> +
>> return node_to_cpumask_map[node];
>> }
>> #endif
>> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
>> index 4f241cc..f57202d 100644
>> --- a/arch/arm64/mm/numa.c
>> +++ b/arch/arm64/mm/numa.c
>> @@ -46,6 +46,9 @@ EXPORT_SYMBOL(node_to_cpumask_map);
>> */
>> const struct cpumask *cpumask_of_node(int node)
>> {
>> + if (node == NUMA_NO_NODE)
>> + return cpu_online_mask;
>> +
>> if (WARN_ON(node >= nr_node_ids))
>> return cpu_none_mask;
>>
>> diff --git a/arch/mips/include/asm/mach-ip27/topology.h b/arch/mips/include/asm/mach-ip27/topology.h
>> index 965f079..04505e6 100644
>> --- a/arch/mips/include/asm/mach-ip27/topology.h
>> +++ b/arch/mips/include/asm/mach-ip27/topology.h
>> @@ -15,8 +15,8 @@ struct cpuinfo_ip27 {
>> extern struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
>>
>> #define cpu_to_node(cpu) (sn_cpu_info[(cpu)].p_nodeid)
>> -#define cpumask_of_node(node) ((node) == -1 ? \
>> - cpu_all_mask : \
>> +#define cpumask_of_node(node) ((node) == NUMA_NO_NODE ? \
>> + cpu_online_mask : \
>> &hub_data(node)->h_cpus)
>> struct pci_bus;
>> extern int pcibus_to_node(struct pci_bus *);
>> diff --git a/arch/mips/include/asm/mach-loongson64/topology.h b/arch/mips/include/asm/mach-loongson64/topology.h
>> index 7ff819a..e78daa6 100644
>> --- a/arch/mips/include/asm/mach-loongson64/topology.h
>> +++ b/arch/mips/include/asm/mach-loongson64/topology.h
>> @@ -5,7 +5,9 @@
>> #ifdef CONFIG_NUMA
>>
>> #define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2)
>> -#define cpumask_of_node(node) (&__node_data[(node)]->cpumask)
>> +#define cpumask_of_node(node) ((node) == NUMA_NO_NODE ? \
>> + cpu_online_mask : \
>> + &__node_data[(node)]->cpumask)
>>
>> struct pci_bus;
>> extern int pcibus_to_node(struct pci_bus *);
>> diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
>> index 2f7e1ea..309f847 100644
>> --- a/arch/powerpc/include/asm/topology.h
>> +++ b/arch/powerpc/include/asm/topology.h
>> @@ -17,9 +17,9 @@ struct device_node;
>>
>> #include <asm/mmzone.h>
>>
>> -#define cpumask_of_node(node) ((node) == -1 ? \
>> - cpu_all_mask : \
>> - node_to_cpumask_map[node])
>> +#define cpumask_of_node(node) ((node) == NUMA_NO_NODE ? \
>> + cpu_online_mask : \
>> + node_to_cpumask_map[node])
>>
>> struct pci_bus;
>> #ifdef CONFIG_PCI
>> diff --git a/arch/s390/include/asm/topology.h b/arch/s390/include/asm/topology.h
>> index cca406f..1bd2e73 100644
>> --- a/arch/s390/include/asm/topology.h
>> +++ b/arch/s390/include/asm/topology.h
>> @@ -78,6 +78,9 @@ static inline int cpu_to_node(int cpu)
>> #define cpumask_of_node cpumask_of_node
>> static inline const struct cpumask *cpumask_of_node(int node)
>> {
>> + if (node == NUMA_NO_NODE)
>> + return cpu_online_mask;
>> +
>> return &node_to_cpumask_map[node];
>> }
>>
>> diff --git a/arch/sparc/include/asm/topology_64.h b/arch/sparc/include/asm/topology_64.h
>> index 34c628a..8c29357 100644
>> --- a/arch/sparc/include/asm/topology_64.h
>> +++ b/arch/sparc/include/asm/topology_64.h
>> @@ -11,9 +11,9 @@ static inline int cpu_to_node(int cpu)
>> return numa_cpu_lookup_table[cpu];
>> }
>>
>> -#define cpumask_of_node(node) ((node) == -1 ? \
>> - cpu_all_mask : \
>> - &numa_cpumask_lookup_table[node])
>> +#define cpumask_of_node(node) ((node) == NUMA_NO_NODE ? \
>> + cpu_online_mask : \
>> + &numa_cpumask_lookup_table[node])
>>
>> struct pci_bus;
>> #ifdef CONFIG_PCI
>> diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
>> index 4b14d23..7fa82e1 100644
>> --- a/arch/x86/include/asm/topology.h
>> +++ b/arch/x86/include/asm/topology.h
>> @@ -69,6 +69,9 @@ extern const struct cpumask *cpumask_of_node(int node);
>> /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
>> static inline const struct cpumask *cpumask_of_node(int node)
>> {
>> + if (node == NUMA_NO_NODE)
>> + return cpu_online_mask;
>> +
>> return node_to_cpumask_map[node];
>> }
>> #endif
>> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
>> index e6dad60..84b28ef 100644
>> --- a/arch/x86/mm/numa.c
>> +++ b/arch/x86/mm/numa.c
>> @@ -861,6 +861,9 @@ void numa_remove_cpu(int cpu)
>> */
>> const struct cpumask *cpumask_of_node(int node)
>> {
>> + if (node == NUMA_NO_NODE)
>> + return cpu_online_mask;
>> +
>> if (node >= nr_node_ids) {
>> printk(KERN_WARNING
>> "cpumask_of_node(%d): node > nr_node_ids(%u)\n",
>> --
>> 2.8.1
>
> .
>
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