From: Ingo Molnar <mingo@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
dalias@libc.org, linux-sh@vger.kernel.org,
catalin.marinas@arm.com, dave.hansen@linux.intel.com,
heiko.carstens@de.ibm.com, linuxarm@huawei.com,
jiaxun.yang@flygoat.com, linux-mips@vger.kernel.org,
mwb@linux.vnet.ibm.com, paulus@samba.org, hpa@zytor.com,
sparclinux@vger.kernel.org, chenhc@lemote.com, will@kernel.org,
cai@lca.pw, linux-s390@vger.kernel.org,
ysato@users.sourceforge.jp, mpe@ellerman.id.au, x86@kernel.org,
rppt@linux.ibm.com, borntraeger@de.ibm.com, dledford@redhat.com,
mingo@redhat.com, jeffrey.t.kirsher@intel.com,
benh@kernel.crashing.org, jhogan@kernel.org,
nfont@linux.vnet.ibm.com, mattst88@gmail.com,
len.brown@intel.com, gor@linux.ibm.com,
anshuman.khandual@arm.com, bp@alien8.de, luto@kernel.org,
tglx@linutronix.de, naveen.n.rao@linux.vnet.ibm.com,
linux-arm-kernel@lists.infradead.org, rth@twiddle.net,
axboe@kernel.dk, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, ralf@linux-mips.org,
tbogendoerfer@suse.de, paul.burton@mips.com,
linux-alpha@vger.kernel.org, ink@jurassic.park.msu.ru,
akpm@linux-foundation.org, robin.murphy@arm.com,
davem@davemloft.net
Subject: Re: [PATCH v2 2/9] x86: numa: check the node id consistently for x86
Date: Mon, 2 Sep 2019 20:17:31 +0200 [thread overview]
Message-ID: <20190902181731.GB35858@gmail.com> (raw)
In-Reply-To: <20190902072542.GN2369@hirez.programming.kicks-ass.net>
* Peter Zijlstra <peterz@infradead.org> wrote:
> Also note that the CONFIG_DEBUG_PER_CPU_MAPS version of
> cpumask_of_node() already does this (although it wants the below fix).
>
> ---
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index e6dad600614c..5f49c10201c7 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -861,7 +861,7 @@ void numa_remove_cpu(int cpu)
> */
> const struct cpumask *cpumask_of_node(int node)
> {
> - if (node >= nr_node_ids) {
> + if ((unsigned)node >= nr_node_ids) {
> printk(KERN_WARNING
> "cpumask_of_node(%d): node > nr_node_ids(%u)\n",
> node, nr_node_ids);
Nitpicking: please also fix the kernel message to say ">=".
With that:
Acked-by: Ingo Molnar <mingo@kernel.org>
Note that:
- arch/arm64/mm/numa.c copied the same sign bug (or unrobustness if we
don't want to call it a bug).
- Kudos to the mm/memcontrol.c and kernel/bpf/syscall.c teams for not
copying that bug. Booo for none of them fixing the buggy pattern
elsewhere in the kernel ;-)
Thanks,
Ingo
next prev parent reply other threads:[~2019-09-02 18:17 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-31 5:58 [PATCH v2 0/9] check the node id consistently across different arches Yunsheng Lin
2019-08-31 5:58 ` [PATCH v2 1/9] arm64: numa: check the node id consistently for arm64 Yunsheng Lin
2019-08-31 5:58 ` [PATCH v2 2/9] x86: numa: check the node id consistently for x86 Yunsheng Lin
2019-08-31 8:55 ` Peter Zijlstra
2019-08-31 10:09 ` Yunsheng Lin
2019-08-31 16:12 ` Peter Zijlstra
2019-09-01 4:45 ` Something about loongson_llsc_mb 陈华才
[not found] ` <2019090410032559707512@loongson.cn>
2019-09-04 9:21 ` Peter Zijlstra
2019-09-04 10:04 ` Peter Zijlstra
2019-09-04 12:57 ` Huang Pei
2019-09-02 5:46 ` [PATCH v2 2/9] x86: numa: check the node id consistently for x86 Yunsheng Lin
2019-09-02 7:25 ` Peter Zijlstra
2019-09-02 12:25 ` Yunsheng Lin
2019-09-02 12:56 ` Peter Zijlstra
2019-09-02 18:22 ` Ingo Molnar
2019-09-02 19:14 ` Peter Zijlstra
2019-09-03 6:19 ` Yunsheng Lin
2019-09-03 7:11 ` Peter Zijlstra
2019-09-03 8:31 ` Yunsheng Lin
2019-09-02 18:17 ` Ingo Molnar [this message]
2019-09-03 7:53 ` [PATCH] x86/mm: Fix cpumask_of_node() error condition Peter Zijlstra
2019-08-31 5:58 ` [PATCH v2 3/9] alpha: numa: check the node id consistently for alpha Yunsheng Lin
2019-08-31 5:58 ` [PATCH v2 4/9] powerpc: numa: check the node id consistently for powerpc Yunsheng Lin
2019-08-31 5:58 ` [PATCH v2 5/9] s390: numa: check the node id consistently for s390 Yunsheng Lin
2019-09-02 4:05 ` kbuild test robot
2019-08-31 5:58 ` [PATCH v2 6/9] sh: numa: check the node id consistently for sh Yunsheng Lin
2019-08-31 5:58 ` [PATCH v2 7/9] sparc64: numa: check the node id consistently for sparc64 Yunsheng Lin
2019-08-31 6:53 ` David Miller
2019-08-31 8:57 ` Yunsheng Lin
2019-08-31 20:02 ` David Miller
2019-09-02 6:08 ` Yunsheng Lin
2019-09-02 15:17 ` David Miller
2019-08-31 5:58 ` [PATCH v2 8/9] mips: numa: check the node id consistently for mips ip27 Yunsheng Lin
2019-08-31 5:58 ` [PATCH v2 9/9] mips: numa: check the node id consistently for mips loongson64 Yunsheng Lin
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