linux-kernel - Re: [RFC PATCH -next] mm/vmstat: Fix build error without CONFIG_VM_EVENT

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Date:   Tue, 22 Oct 2019 20:57:35 +0800
From:   Yuehaibing <yuehaibing@...wei.com>
To:     <sfr@...b.auug.org.au>, <khlebnikov@...dex-team.ru>,
        <akpm@...ux-foundation.org>, <mhocko@...e.com>,
        <hannes@...xchg.org>, <vbabka@...e.cz>, <jannh@...gle.com>,
        <gregkh@...uxfoundation.org>, <janne.huttunen@...ia.com>,
        <arunks@...eaurora.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH -next] mm/vmstat: Fix build error without
 CONFIG_VM_EVENT_COUNTERS

Pls ignore this, seems has fixed.

https://lore.kernel.org/linux-mm/cd1c42ae-281f-c8a8-70ac-1d01d417b2e1@infradead.org/T/#u

On 2019/10/22 20:51, YueHaibing wrote:
> If CONFIG_VM_EVENT_COUNTERS is n but CONFIG_MEMCG is y,
> vmstat_text is not equal stat_items_size:
> 
> mm/vmstat.c: In function vmstat_start:
> ./include/linux/compiler.h:350:38: error: call to __compiletime_assert_1659 declared
>  with attribute error: BUILD_BUG_ON failed: stat_items_size != ARRAY_SIZE(vmstat_text) * sizeof(unsigned long)
>   _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 2fdf561910a9 ("mm/memcontrol: use vmstat names for printing statistics")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  mm/vmstat.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index b2fd344..a19ed6e 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -1655,8 +1655,6 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
>  	stat_items_size += sizeof(struct vm_event_state);
>  #endif
>  
> -	BUILD_BUG_ON(stat_items_size !=
> -		     ARRAY_SIZE(vmstat_text) * sizeof(unsigned long));
>  	v = kmalloc(stat_items_size, GFP_KERNEL);
>  	m->private = v;
>  	if (!v)
>