[RFC PATCH v1 27/57] net: e1000: Remove PAGE_SIZE compile-time constant assumption

[Ryan Roberts]

+ Przemek Kitszel, Tony Nguyen

This was a rather tricky series to get the recipients correct for and my script
did not realize that "supporter" was a pseudonym for "maintainer" so you were
missed off the original post. Appologies!

More context in cover letter:
https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/


On 14/10/2024 11:58, Ryan Roberts wrote:
> To prepare for supporting boot-time page size selection, refactor code
> to remove assumptions about PAGE_SIZE being compile-time constant. Code
> intended to be equivalent when compile-time page size is active.
> 
> Convert CPP conditionals to C conditionals. The compiler will dead code
> strip when doing a compile-time page size build, for the same end
> effect. But this will also work with boot-time page size builds.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>
> ---
> 
> ***NOTE***
> Any confused maintainers may want to read the cover note here for context:
> https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/
> 
>  drivers/net/ethernet/intel/e1000/e1000_main.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
> index ab7ae418d2948..cc14788f5bb04 100644
> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
> @@ -3553,12 +3553,10 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
>  
>  	if (max_frame <= E1000_RXBUFFER_2048)
>  		adapter->rx_buffer_len = E1000_RXBUFFER_2048;
> -	else
> -#if (PAGE_SIZE >= E1000_RXBUFFER_16384)
> +	else if (PAGE_SIZE >= E1000_RXBUFFER_16384)
>  		adapter->rx_buffer_len = E1000_RXBUFFER_16384;
> -#elif (PAGE_SIZE >= E1000_RXBUFFER_4096)
> +	else if (PAGE_SIZE >= E1000_RXBUFFER_4096)
>  		adapter->rx_buffer_len = PAGE_SIZE;
> -#endif
>  
>  	/* adjust allocation if LPE protects us, and we aren't using SBP */
>  	if (!hw->tbi_compatibility_on &&