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Message-ID: <20231110154208.5UoC_qsI@linutronix.de>
Date: Fri, 10 Nov 2023 16:42:08 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in
argument 1 (different address spaces)
On 2023-11-08 09:04:40 [+0800], kernel test robot wrote:
…
Could you please explain what is wrong here? The code in line 73 has no
percpu reference at all. Or expects an argument.
> sparse warnings: (new ones prefixed by >>)
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got unsigned int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got unsigned int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got unsigned int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got unsigned int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got unsigned int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got unsigned int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got unsigned int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got unsigned int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got int [noderef] __percpu *
> >> lib/flex_proportions.c:73:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void *ptr @@ got int [noderef] __percpu * @@
> lib/flex_proportions.c:73:9: sparse: expected void *ptr
> lib/flex_proportions.c:73:9: sparse: got int [noderef] __percpu *
> lib/flex_proportions.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/percpu_counter.h, ...):
>
> vim +73 lib/flex_proportions.c
>
> 55
> 56 /*
> 57 * Declare @periods new periods. It is upto the caller to make sure period
> 58 * transitions cannot happen in parallel.
> 59 *
> 60 * The function returns true if the proportions are still defined and false
> 61 * if aging zeroed out all events. This can be used to detect whether declaring
> 62 * further periods has any effect.
> 63 */
> 64 bool fprop_new_period(struct fprop_global *p, int periods)
> 65 {
> 66 s64 events = percpu_counter_sum(&p->events);
> 67
> 68 /*
> 69 * Don't do anything if there are no events.
> 70 */
> 71 if (events <= 1)
> 72 return false;
> > 73 preempt_disable_nested();
> 74 write_seqcount_begin(&p->sequence);
> 75 if (periods < 64)
> 76 events -= events >> periods;
> 77 /* Use addition to avoid losing events happening between sum and set */
> 78 percpu_counter_add(&p->events, -events);
> 79 p->period += periods;
> 80 write_seqcount_end(&p->sequence);
> 81 preempt_enable_nested();
> 82
> 83 return true;
> 84 }
> 85
>
Sebastian
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