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Message-ID: <561E7B74.6010304@caviumnetworks.com>
Date: Wed, 14 Oct 2015 08:57:40 -0700
From: David Daney <ddaney@...iumnetworks.com>
To: Sakshi Bansal <sakshi.april5@...il.com>
CC: <aaro.koskinen@...ia.com>,
Paul Martin <paul.martin@...ethink.co.uk>, <joe@...ches.com>,
<janne.huttunen@...ia.com>, <arnd@...db.de>,
<linux-kernel@...r.kernel.org>, <jamie.lawler@...il.com>,
<gregkh@...uxfoundation.org>, <david.daney@...ium.com>,
<robertoxmed@...il.com>, <okash.khawaja@...il.com>,
<ralf@...ux-mips.org>, <aybuke.147@...il.com>,
<helen.fornazier@...il.com>, <jtk54@...nell.edu>,
<devel@...verdev.osuosl.org>
Subject: Re: [PATCH] staging: octeon: fixed few coding style warnings
On 10/14/2015 08:51 AM, Sakshi Bansal wrote:
> I am testing it on Fedora 21.
Does your Fedora 21 platform use this driver in any way? Does it even
build the driver (produce any .o files for any of the files you changed)?
No, I didn't think so.
You have to have a way to test the patch (or at least compile the
files), or have other people test it for you if you make changes.
> The change under concern was mentioned as
> a "Check ".
Yes, notice that 'CHECK:' is emitted in the color green. It is not a
warning. Your patch subject line said you were fixing warnings. This
is not true.
>
> On Oct 14, 2015 9:17 PM, "David Daney" <ddaney@...iumnetworks.com
> <mailto:ddaney@...iumnetworks.com>> wrote:
>
> On 10/14/2015 07:06 AM, Sakshi Bansal wrote:
>
> Fixed allignment issues and line over 80 characters
>
>
> Use spell checking on 'allignment'
>
> But that is not the main problem with the patch...
>
>
> You are changing things other than white space and comment
> formatting, can you tell us on which platforms the patch was tested
> to verify that you didn't break anything?
>
>
> Signed-off-by: Sakshi Bansal <sakshi.april5@...il.com
> <mailto:sakshi.april5@...il.com>>
>
>
>
> NAK.
>
> [...]
>
> diff --git a/drivers/staging/octeon/ethernet-mdio.c
> b/drivers/staging/octeon/ethernet-mdio.c
> index fd9b3d8..590a6cb 100644
> --- a/drivers/staging/octeon/ethernet-mdio.c
> +++ b/drivers/staging/octeon/ethernet-mdio.c
> @@ -180,7 +180,7 @@ int cvm_oct_phy_setup_device(struct
> net_device *dev)
> priv->phydev = of_phy_connect(dev, phy_node,
> cvm_oct_adjust_link, 0,
> PHY_INTERFACE_MODE_GMII);
>
> - if (priv->phydev == NULL)
> + if (!priv->phydev)
>
>
>
> Not a coding style change. There is no WARNING generated for this case.
>
>
>
> return -ENODEV;
>
> priv->last_link = 0;
> diff --git a/drivers/staging/octeon/ethernet-mem.c
> b/drivers/staging/octeon/ethernet-mem.c
> index 5a5cdb3..d6172e4 100644
> --- a/drivers/staging/octeon/ethernet-mem.c
> +++ b/drivers/staging/octeon/ethernet-mem.c
> @@ -34,7 +34,7 @@ static int cvm_oct_fill_hw_skbuff(int pool,
> int size, int elements)
> while (freed) {
> struct sk_buff *skb = dev_alloc_skb(size + 256);
>
> - if (unlikely(skb == NULL))
> + if (unlikely(!skb))
>
>
> Same
>
> break;
> skb_reserve(skb, 256 - (((unsigned
> long)skb->data) & 0x7f));
> *(struct sk_buff **)(skb->data - sizeof(void
> *)) = skb;
> @@ -98,7 +98,7 @@ static int cvm_oct_fill_hw_memory(int pool,
> int size, int elements)
> * just before the block.
> */
> memory = kmalloc(size + 256, GFP_ATOMIC);
> - if (unlikely(memory == NULL)) {
> + if (unlikely(!memory)) {
>
>
> Same
>
> pr_warn("Unable to allocate %u bytes
> for FPA pool %d\n",
> elements * size, pool);
> break;
> diff --git a/drivers/staging/octeon/ethernet-rgmii.c
> b/drivers/staging/octeon/ethernet-rgmii.c
> index 51dcb61..3d7513c 100644
> --- a/drivers/staging/octeon/ethernet-rgmii.c
> +++ b/drivers/staging/octeon/ethernet-rgmii.c
> @@ -68,7 +68,7 @@ static void cvm_oct_rgmii_poll(struct
> net_device *dev)
> struct octeon_ethernet *priv = netdev_priv(dev);
> unsigned long flags = 0;
> cvmx_helper_link_info_t link_info;
> - int use_global_register_lock = (priv->phydev == NULL);
> + int use_global_register_lock = (!priv->phydev);
>
>
> Same.
>
> I could go on, but I think you see the pattern here.
>
> Your changelog says you are fixing warnings, but none of these are
> warning fixes.
>
> In fact it is perfectly acceptable to compare a pointer to NULL. It
> is a common idiom in the kernel. The original author of the code
> thought it was more clear this way, and you are causing code churn
> for no reason.
>
> Try to run this command on the kernel sources:
> $ git grep -e '== NULL' | wc -l
> 21488
>
> I would suggest that you convince people that the other 21,000 cases
> of comparison to NULL need changing before you do it to this driver.
>
> David Daney
>
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