netdev - [RFC PATCH v1 28/57] net: igbvf: Remove PAGE_SIZE compile-time constant assumption

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Message-ID: <20241014105912.3207374-28-ryan.roberts@arm.com>
Date: Mon, 14 Oct 2024 11:58:35 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: "David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	David Hildenbrand <david@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Greg Marsden <greg.marsden@...cle.com>,
	Ivan Ivanov <ivan.ivanov@...e.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Kalesh Singh <kaleshsingh@...gle.com>,
	Marc Zyngier <maz@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <mbrugger@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Paolo Abeni <pabeni@...hat.com>,
	Will Deacon <will@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>,
	intel-wired-lan@...ts.osuosl.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	netdev@...r.kernel.org
Subject: [RFC PATCH v1 28/57] net: igbvf: Remove PAGE_SIZE compile-time constant assumption

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@....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/igbvf/netdev.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index 925d7286a8ee4..2e11d999168de 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2419,12 +2419,10 @@ static int igbvf_change_mtu(struct net_device *netdev, int new_mtu)
 		adapter->rx_buffer_len = 1024;
 	else if (max_frame <= 2048)
 		adapter->rx_buffer_len = 2048;
-	else
-#if (PAGE_SIZE / 2) > 16384
+	else if ((PAGE_SIZE / 2) > 16384)
 		adapter->rx_buffer_len = 16384;
-#else
+	else
 		adapter->rx_buffer_len = PAGE_SIZE / 2;
-#endif
 
 	/* adjust allocation if LPE protects us, and we aren't using SBP */
 	if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
-- 
2.43.0