linux-kernel - Re: [PATCH] LDT - Linux Driver Template

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Date:	Wed, 14 Nov 2012 02:14:58 +0200
From:	Constantine Shulyupin <const@...elinux.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, celinux-dev@...ts.celinuxforum.org
Subject: Re: [PATCH] LDT - Linux Driver Template

On Tue, Nov 13, 2012 at 9:01 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
>> +#define pr_debug_hex(h)      pr_debug("%s:%d %s %s = 0x%lX\n", \
>> +     __file__, __LINE__, __func__, #h, (long int)h)
>
> This is not needed at all, just use the proper printk() attribute.

Macro above allows tidy tracing code:

        pr_debug_hex(ioread8(port_ptr + UART_IER));
        pr_debug_hex(ioread8(port_ptr + UART_IIR));
        pr_debug_hex(ioread8(port_ptr + UART_FCR));
        pr_debug_hex(ioread8(port_ptr + UART_LCR));
        pr_debug_hex(ioread8(port_ptr + UART_MCR));
        pr_debug_hex(ioread8(port_ptr + UART_LSR));
        pr_debug_hex(ioread8(port_ptr + UART_MSR));

Without that macro, code above should be rewritten with pr_debug (or printk) as:

        pr_debug("UART_IER=0x%02X\n", ioread8(port_ptr + UART_IER));
        pr_debug("UART_IIR=0x%02X\n", ioread8(port_ptr + UART_IIR));
        pr_debug("UART_FCR=0x%02X\n", ioread8(port_ptr + UART_FCR));
        pr_debug("UART_LCR=0x%02X\n", ioread8(port_ptr + UART_LCR));
        pr_debug("UART_MCR=0x%02X\n", ioread8(port_ptr + UART_MCR));
        pr_debug("UART_LSR=0x%02X\n", ioread8(port_ptr + UART_LSR));
        pr_debug("UART_MSR=0x%02X\n", ioread8(port_ptr + UART_MSR));

That is less readable and less supportable.

I prefer the fist case.

Actually I use a lot shorter macro:
#define traceh(h)   printk("%s = 0x%lX\n", #h, (long int)h)

What is you opinion? Which method is better?
Thank you.
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