linux-kernel - Re: smpboot: CPU numbers printed as warning

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Message-ID: <60b342c3-23ab-12f7-8e04-4fa0bcd3c508@molgen.mpg.de>
Date:   Tue, 16 Feb 2021 12:58:19 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Borislav Petkov <bp@...en8.de>, Petr Mladek <pmladek@...e.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>, it+linux-x86@...gen.mpg.de,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        John Ogness <john.ogness@...utronix.de>
Subject: Re: smpboot: CPU numbers printed as warning

Dear Borislav, dear Petr,


Am 16.02.21 um 11:14 schrieb Borislav Petkov:
> On Tue, Feb 16, 2021 at 10:49:04AM +0100, Petr Mladek wrote:
>> Also you should add '\n' into the previous string to make the behavior
>> clear. It will always be printed on a new line when pr_info()
>> is used.
> 
> This was made to use pr_cont() on purpose so that the output is compact,
> for example:
> 
> [    4.088605] x86: Booting SMP configuration:
> [    4.089511] .... node  #0, CPUs:          #1   #2   #3   #4   #5   #6   #7   #8   #9  #10  #11  #12  #13  #14  #15  #16  #17  #18  #19  #20  #21  #22  #23  #24  #25  #26  #27  #28  #29  #30  #31  #32  #33  #34  #35  #36  #37  #38  #39  #40  #41  #42  #43  #44  #45  #46  #47  #48  #49  #50  #51  #52  #53  #54  #55  #56  #57  #58  #59  #60  #61  #62  #63
> [    4.188510] .... node  #1, CPUs:    #64  #65  #66  #67  #68  #69  #70  #71  #72  #73  #74  #75  #76  #77  #78  #79  #80  #81  #82  #83  #84  #85  #86  #87  #88  #89  #90  #91  #92  #93  #94  #95  #96  #97  #98  #99 #100 #101 #102 #103 #104 #105 #106 #107 #108 #109 #110 #111 #112 #113 #114 #115 #116 #117 #118 #119 #120 #121 #122 #123 #124 #125 #126 #127
> [    4.307511] .... node  #0, CPUs:   #128 #129 #130 #131 #132 #133 #134 #135 #136 #137 #138 #139 #140 #141 #142 #143 #144 #145 #146 #147 #148 #149 #150 #151 #152 #153 #154 #155 #156 #157 #158 #159 #160 #161 #162 #163 #164 #165 #166 #167 #168 #169 #170 #171 #172 #173 #174 #175 #176 #177 #178 #179 #180 #181 #182 #183 #184 #185 #186 #187 #188 #189 #190 #191
> [    4.416511] .... node  #1, CPUs:   #192 #193 #194 #195 #196 #197 #198 #199 #200 #201 #202 #203 #204 #205 #206 #207 #208 #209 #210 #211 #212 #213 #214 #215 #216 #217 #218 #219 #220 #221 #222 #223 #224 #225 #226 #227 #228 #229 #230 #231 #232 #233 #234 #235 #236 #237 #238 #239 #240 #241 #242 #243 #244 #245 #246 #247 #248 #249 #250 #251 #252 #253 #254 #255
> [    4.531683] smp: Brought up 2 nodes, 256 CPUs
> [    4.534510] smpboot: Max logical packages: 2
> [    4.535527] smpboot: Total of 256 processors activated (1147449.34 BogoMIPS)

Yes, the intention is clear, but it’s not working perfectly in all 
situations. Any ideas, how to improve that? After reading John’s 
response, I’d go with `pr_cont(KERN_INFO "message part");`.

By the way, what are these CPU numbers useful for? Isn’t

     smp: Brought up 2 nodes, 256 CPUs

enough information, and nothing else needed for the majority of users?


Kind regards,

Paul