linux-kernel - Re: [PATCH 3/3] tools/vm/slabinfo: update struct slabinfo members' types

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Date:	Wed, 11 Nov 2015 12:55:05 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH 3/3] tools/vm/slabinfo: update struct slabinfo members'
 types

On Tue, 10 Nov 2015, Sergey Senozhatsky wrote:

> Align some of `struct slabinfo' members' types with
> `struct kmem_cache' to suppress gcc warnings:
> 
> slabinfo.c:847:22: warning: comparison between signed
>   and unsigned integer expressions [-Wsign-compare]
> slabinfo.c:869:20: warning: comparison between signed
>   and unsigned integer expressions [-Wsign-compare]
> slabinfo.c:872:22: warning: comparison between signed
>   and unsigned integer expressions [-Wsign-compare]
> slabinfo.c:894:20: warning: comparison between signed
>   and unsigned integer expressions [-Wsign-compare]
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> ---
>  tools/vm/slabinfo.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/vm/slabinfo.c b/tools/vm/slabinfo.c
> index 86e698d0..1813854 100644
> --- a/tools/vm/slabinfo.c
> +++ b/tools/vm/slabinfo.c
> @@ -19,6 +19,7 @@
>  #include <getopt.h>
>  #include <regex.h>
>  #include <errno.h>
> +#include <limits.h>
>  
>  #define MAX_SLABS 500
>  #define MAX_ALIASES 500
> @@ -28,10 +29,11 @@ struct slabinfo {
>  	char *name;
>  	int alias;
>  	int refs;
> -	int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
> -	int hwcache_align, object_size, objs_per_slab;
> -	int sanity_checks, slab_size, store_user, trace;
> +	int aliases, cache_dma, cpu_slabs, destroy_by_rcu;
> +	int sanity_checks, store_user, trace;
>  	int order, poison, reclaim_account, red_zone;
> +	unsigned int hwcache_align, align, object_size;
> +	unsigned int objs_per_slab, slab_size;
>  	unsigned long partial, objects, slabs, objects_partial, objects_total;
>  	unsigned long alloc_fastpath, alloc_slowpath;
>  	unsigned long free_fastpath, free_slowpath;
> @@ -766,10 +768,10 @@ static void totals(void)
>  
>  	int used_slabs = 0;
>  	char b1[20], b2[20], b3[20], b4[20];
> -	unsigned long long max = 1ULL << 63;
> +	unsigned long long max = ULLONG_MAX;
>  
>  	/* Object size */
> -	unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
> +	unsigned int min_objsize = UINT_MAX, max_objsize = 0, avg_objsize;
>  
>  	/* Number of partial slabs in a slabcache */
>  	unsigned long long min_partial = max, max_partial = 0,

avg_objsize should not be unsigned int.
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