linux-kernel - Re: [PATCH v2 05/15] NTB: ntb_tool: Add full multi-port NTB API support

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Date:   Tue, 5 Dec 2017 12:16:57 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Jon Mason <jdmason@...zu.us>, Serge Semin <fancer.lancer@...il.com>
Cc:     Dave Jiang <dave.jiang@...el.com>,
        "Hubbe, Allen" <Allen.Hubbe@....com>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "Yu, Xiangliang" <Xiangliang.Yu@....com>,
        Gary R Hook <gary.hook@....com>, Sergey.Semin@...latforms.ru,
        linux-ntb <linux-ntb@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/15] NTB: ntb_tool: Add full multi-port NTB API
 support



On 05/12/17 11:03 AM, Jon Mason wrote:
>> +static ssize_t tool_fn_read(struct tool_ctx *tc, char __user *ubuf,
>> +                           size_t size, loff_t *offp,
>> +                           u64 (*fn_read)(struct ntb_dev *))
>>   {
>>          size_t buf_size;
>> -       char *buf;
>> -       ssize_t pos, rc;
>> +       char buf[32];
> 
> I would think you would want the malloc like before, but if not then
> make this a #define and reference it as necessary throughout the code.

I disagree. Allocating a small 32-byte buf on the stack is a nice 
cleanup. I'm not sure what you are referring to about the #define.

Logan