Re: [PATCH v2][TRIVIAL] x86/smpboot: fix cpu bootup message

Borislav Petkov
2013-12-23T13:34:09Z

On Mon, Dec 23, 2013 at 04:33:00PM +0800, Xie XiuQi wrote:
> When CPU0 and CPU1 aren't in same package, we got message
> like this:
>
> [ 0.995698] x86: Booting SMP configuration:
> [ 0.999858] .... node #0, CPUs: #1 #2 #3 #4 #5 #6 #7 #8
> [ 1.201584] .... node #1, CPUs: #9 #10 #11 #12 #13 #14 #15 #16
> [ 1.402525] .... node #2, CPUs: #17 #18 #19 #20 #21 #22 #23 #24
> [ 1.603620] .... node #3, CPUs: #25 #26 #27 #28 #29 #30 #31 #32
> [ 1.804226] .... node #4, CPUs: #33 #34 #35 #36 #37 #38 #39
> [ 1.914040] .... node #5, CPUs: #40 #41 #42 #43 #44 #45 #46 #47
> [ 2.115568] .... node #6, CPUs: #48 #49 #50 #51 #52 #53 #54 #55
> [ 2.316541] .... node #7, CPUs: #56 #57 #58 #59 #60 #61 #62 #63
> [ 2.517030] x86: Booted up 8 nodes, 64 CPUs
>
> My box's configuration as below:
> xiexiuqi@localhost:~> lscpu
> [...]
> NUMA node0 CPU(s): 1-8
> NUMA node1 CPU(s): 9-16
> NUMA node2 CPU(s): 17-24
> NUMA node3 CPU(s): 25-32
> NUMA node4 CPU(s): 0,33-39
> NUMA node5 CPU(s): 40-47
> NUMA node6 CPU(s): 48-55
> NUMA node7 CPU(s): 56-63
>
> With this patch, we'll get message like this:
>
> [ 0.995698] x86: Booting SMP configuration:
> [ 0.999858] .... node #0, CPUs: #1 #2 #3 #4 #5 #6 #7 #8
> [ 1.201584] .... node #1, CPUs: #9 #10 #11 #12 #13 #14 #15 #16
> [ 1.402525] .... node #2, CPUs: #17 #18 #19 #20 #21 #22 #23 #24
> [ 1.603620] .... node #3, CPUs: #25 #26 #27 #28 #29 #30 #31 #32
> [ 1.804226] .... node #4, CPUs: #33 #34 #35 #36 #37 #38 #39
> [ 1.914040] .... node #5, CPUs: #40 #41 #42 #43 #44 #45 #46 #47
> [ 2.115568] .... node #6, CPUs: #48 #49 #50 #51 #52 #53 #54 #55
> [ 2.316541] .... node #7, CPUs: #56 #57 #58 #59 #60 #61 #62 #63
> [ 2.517030] x86: Booted up 8 nodes, 64 CPUs
>
> v2:
> - fix a typo
>
> Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
> ---
> arch/x86/kernel/smpboot.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 85dc05a..9e82c1e 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -639,7 +639,7 @@ static void announce_cpu(int cpu, int apicid)
> {
> static int current_node = -1;
> int node = early_cpu_to_node(cpu);
> - static int width, node_width;
> + static int width, node_width, padding;
>
> if (!width)
> width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */
> @@ -658,11 +658,13 @@ static void announce_cpu(int cpu, int apicid)
>
> printk(KERN_INFO ".... node %*s#%d, CPUs: ",
> node_width - num_digits(node), " ", node);
> - }
>
> - /* Add padding for the BSP */
> - if (cpu == 1)
> - pr_cont("%*s", width + 1, " ");
> + /* Add padding for the BSP */
> + if (!padding && (early_cpu_to_node(0) == current_node)) {

You don't need "padding".

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Regards/Gruss,
Boris.

Sent from a fat crate under my desk. Formatting is fine.
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