Re: [PATCH] bpftool: optimize if statement code

[Martin KaFai Lau <martin.lau@linux.dev>]

On 10/15/24 5:11 AM, Quentin Monnet wrote:
> 2024-10-15 19:09 UTC+0800 ~ Liu Jing <liujing@cmss.chinamobile.com>
>> Since both conditions are used to check whether len is valid, we can combine 
>> the two conditions into a single if statement
>> Signed-off-by: Liu Jing <liujing@cmss.chinamobile.com>
>> ---
>>   tools/bpf/bpftool/feature.c | 5 ++---
>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
>> index 4dbc4fcdf473..0121e0fd6949 100644
>> --- a/tools/bpf/bpftool/feature.c
>> +++ b/tools/bpf/bpftool/feature.c
>> @@ -158,10 +158,9 @@ static int get_vendor_id(int ifindex)
>>       len = read(fd, buf, sizeof(buf));
>>       close(fd);
>> -    if (len < 0)
>> -        return -1;
>> -    if (len >= (ssize_t)sizeof(buf))
>> +    if ((len < 0) || (len >= (ssize_t)sizeof(buf)))
>>           return -1;
>> +
>>       buf[len] = '\0';
>>       return strtol(buf, NULL, 0);
> 
> 
> Thanks. I'm not strictly opposed to the change, but it doesn't bring much value 
> in my opinion. I don't think this will "optimize" the statement beyond what the 
> compiler does already.

+1

The current code is good as is.

pw-bot: cr