linux-kernel - [PATCH] vmxnet3: prevent building with 256K pages

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Date:   Tue, 15 Jun 2021 22:35:04 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kuba@...nel.org, davem@...emloft.net,
        pv-drivers@...are.com, doshir@...are.com,
        christophe.leroy@...roup.eu
Subject: [PATCH] vmxnet3: prevent building with 256K pages

This driver assigns PAGE_SIZE to a u16, which can't work when the page
size is 256K. As reported by lkp:

 drivers/net/vmxnet3/vmxnet3_drv.c: In function 'vmxnet3_rq_init':
 arch/powerpc/include/asm/page.h:24:20: warning: conversion from 'long unsigned int' to 'u16' changes value from '262144' to '0'
 drivers/net/vmxnet3/vmxnet3_drv.c:1784:29: note: in expansion of macro 'PAGE_SIZE'
  1784 |    rq->buf_info[0][i].len = PAGE_SIZE;
                                     ^~~~~~~~~

Simliar to what was done previously in commit fbdf0e28d061 ("vmxnet3:
prevent building with 64K pages"), prevent the driver from building when
256K pages are enabled.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 drivers/net/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 74dc8e249faa..da46898f060a 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -549,7 +549,7 @@ config VMXNET3
 	depends on PCI && INET
 	depends on !(PAGE_SIZE_64KB || ARM64_64K_PAGES || \
 		     IA64_PAGE_SIZE_64KB || MICROBLAZE_64K_PAGES || \
-		     PARISC_PAGE_SIZE_64KB || PPC_64K_PAGES)
+		     PARISC_PAGE_SIZE_64KB || PPC_64K_PAGES || PPC_256K_PAGES)
 	help
 	  This driver supports VMware's vmxnet3 virtual ethernet NIC.
 	  To compile this driver as a module, choose M here: the
-- 
2.25.1