Re: [dpdk-dev] [PATCH v3 08/13] eal: replace rte_panic instances in hugepage_info

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 13-Apr-18 7:30 PM, Arnon Warshavsky wrote:
> replace panic calls with log and retrun value.
> 
> Signed-off-by: Arnon Warshavsky <arnon@qwilt.com>
> ---
>   lib/librte_eal/linuxapp/eal/eal_hugepage_info.c | 21 +++++++++++++++------
>   1 file changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
> index 8bbf771..43af5b5 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
> @@ -80,8 +80,11 @@
>   	unsigned long long size = 0;
>   
>   	FILE *fd = fopen(proc_meminfo, "r");
> -	if (fd == NULL)
> -		rte_panic("Cannot open %s\n", proc_meminfo);
> +	if (fd == NULL) {
> +		RTE_LOG(CRIT, EAL, "%s(): Cannot open %s\n",
> +				__func__, proc_meminfo);
> +		return 0;
> +	}
>   	while(fgets(buffer, sizeof(buffer), fd)){
>   		if (strncmp(buffer, str_hugepagesz, hugepagesz_len) == 0){
>   			size = rte_str_to_size(&buffer[hugepagesz_len]);
> @@ -89,8 +92,11 @@
>   		}
>   	}
>   	fclose(fd);
> -	if (size == 0)
> -		rte_panic("Cannot get default hugepage size from %s\n", proc_meminfo);
> +	if (size == 0) {
> +		RTE_LOG(CRIT, EAL, "%s(): Cannot get default hugepage size from %s\n",
> +						 __func__, proc_meminfo);
> +		return 0;
> +	}
>   	return size;

If returning default hugepage size of 0 is now a possibility, the 
calling code needs to be able to handle that. Perhaps rewrite it as 
returning int, and accepting pointer to pagesz? e.g.

static int get_default_hp_size(uint64_t *page_sz)

and fix the code below to handle error in reading default page size?

>   }
>   
> @@ -116,8 +122,11 @@
>   	char *retval = NULL;
>   
>   	FILE *fd = fopen(proc_mounts, "r");
> -	if (fd == NULL)
> -		rte_panic("Cannot open %s\n", proc_mounts);
> +	if (fd == NULL) {
> +		RTE_LOG(CRIT, EAL, "%s(): Cannot open %s\n",
> +				__func__, proc_mounts);
> +		return NULL;
> +	}
>   
>   	if (default_size == 0)
>   		default_size = get_default_hp_size();
>

-- 
Thanks,
Anatoly