linux-kernel - Re: [PATCH -next] iwlwifi: pcie: Use bitwise instead of arithmetic operator for flags

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Date:   Tue, 05 May 2020 20:19:02 -0700
From:   Joe Perches <joe@...ches.com>
To:     Samuel Zou <zou_wei@...wei.com>, johannes.berg@...el.com,
        emmanuel.grumbach@...el.com, luciano.coelho@...el.com,
        linuxwifi@...el.com, kvalo@...eaurora.org, davem@...emloft.net
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] iwlwifi: pcie: Use bitwise instead of arithmetic
 operator for flags

On Wed, 2020-05-06 at 11:07 +0800, Samuel Zou wrote:
> This silences the following coccinelle warning:
> 
> "WARNING: sum of probable bitmasks, consider |"

I suggest instead ignoring bad and irrelevant warnings.

PREFIX_LEN is 32 not 0x20 or BIT(5)
PCI_DUMP_SIZE is 352

> diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
[]
> @@ -109,9 +109,9 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans)
>  
>  	/* Alloc a max size buffer */
>  	alloc_size = PCI_ERR_ROOT_ERR_SRC +  4 + PREFIX_LEN;
> -	alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN);
> -	alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN);
> -	alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN);
> +	alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE | PREFIX_LEN);
> +	alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE | PREFIX_LEN);
> +	alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE | PREFIX_LEN);
>  
>  	buf = kmalloc(alloc_size, GFP_ATOMIC);
>  	if (!buf)