netdev - Re: [PATCH v4 04/10] net/ps3_gelic: Add new macro BUG_ON

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Date:   Sun, 25 Jul 2021 20:20:24 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Geoff Levand <geoff@...radead.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v4 04/10] net/ps3_gelic: Add new macro BUG_ON_DEBUG

Geoff Levand <geoff@...radead.org> a écrit :

> Add a new preprocessor macro BUG_ON_DEBUG, that expands to BUG_ON when
> the preprocessor macro DEBUG is defined, or to WARN_ON when DEBUG is not
> defined.  Also, replace all occurrences of BUG_ON with BUG_ON_DEBUG.

Why is BUG_ON() needed at all if WARN_ON() is enough ?

You just have to set panic_on_warn  to get the system to stop at first  
warning.

BUG_ON() should be avoided unless vital.

Please read  
https://www.kernel.org/doc/html/latest/process/deprecated.html#bug-and-bug-on

Christophe


>
> Signed-off-by: Geoff Levand <geoff@...radead.org>
> ---
>  drivers/net/ethernet/toshiba/ps3_gelic_net.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c  
> b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
> index ded467d81f36..946e9bfa071b 100644
> --- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c
> +++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
> @@ -44,6 +44,13 @@ MODULE_AUTHOR("SCE Inc.");
>  MODULE_DESCRIPTION("Gelic Network driver");
>  MODULE_LICENSE("GPL");
>
> +#define BUG_ON_DEBUG(_cond) do { \
> +	if (__is_defined(DEBUG)) \
> +		BUG_ON(_cond); \
> +	else \
> +		WARN_ON(_cond); \
> +} while (0)
> +
>  int gelic_card_set_irq_mask(struct gelic_card *card, u64 mask)
>  {
>  	struct device *dev = ctodev(card);
> @@ -505,7 +512,7 @@ static void gelic_descr_release_tx(struct  
> gelic_card *card,
>  	struct sk_buff *skb = descr->skb;
>  	struct device *dev = ctodev(card);
>
> -	BUG_ON(!(be32_to_cpu(descr->hw_regs.data_status) &
> +	BUG_ON_DEBUG(!(be32_to_cpu(descr->hw_regs.data_status) &
>  		GELIC_DESCR_TX_TAIL));
>
>  	dma_unmap_single(dev, be32_to_cpu(descr->hw_regs.payload.dev_addr),
> @@ -1667,7 +1674,7 @@ static void gelic_card_get_vlan_info(struct  
> gelic_card *card)
>  	}
>
>  	if (card->vlan[GELIC_PORT_ETHERNET_0].tx) {
> -		BUG_ON(!card->vlan[GELIC_PORT_WIRELESS].tx);
> +		BUG_ON_DEBUG(!card->vlan[GELIC_PORT_WIRELESS].tx);
>  		card->vlan_required = 1;
>  	} else
>  		card->vlan_required = 0;
> @@ -1709,7 +1716,7 @@ static int ps3_gelic_driver_probe(struct  
> ps3_system_bus_device *sb_dev)
>  	if (result) {
>  		dev_err(dev, "%s:%d: ps3_dma_region_create failed: %d\n",
>  			__func__, __LINE__, result);
> -		BUG_ON("check region type");
> +		BUG_ON_DEBUG("check region type");
>  		goto fail_dma_region;
>  	}
>
> --
> 2.25.1