[PATCH 6/6] arm64: defconfig: Switch Ethernet drivers to modules

[Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>]

Development of Linux kernel progressed over last 10 years and it is easy
to generate now initramfs for building own kernel, e.g. with Yocto or
mkosi.  Therefore for a few years of reviews on mailing lists, all new
options enabled in arm64 defconfig were with assumption of having
initramfs which can load bare minimum of modules to mount filesystem
from network or disk.  Basically network driver as built-in is not
anymore essential to boot the system, so switch almost all Ethernet
drivers to modules to save on kernel image size.

Similarly 9P network filesystem for QEMU, especially that testing kernel
unuder QEMU does not have any size or build process constraints and can
use initramfs with -initrd argument.

Notable exceptions / diff explanations:

1. Intel CONFIG_IGB stays as built-in, because of dependency on I2C
   which is also built-in.

2. CONFIG_BCM4908_ENET and CONFIG_BCMASP appear in the diff, because
   they were default=y (via ARCH_BCMBCA or ARCH_BCM_IPROC).

3. CONFIG_HNS3_HCLGE and CONFIG_HNS3_ENET are removed, because they are
   default=m.

Moving code to modules has positive impact on kernel image size, thus
boot time of all users not using above drivers and ability to flash
fixed-size boot partitions.

Old Image size: 41.11 MiB (Image.gz: 14.69 MiB)
New Image size: 39.14 MiB (Image.gz: 13.82 MiB)

bloat-o-meter of vmlinux:
add/remove: 4/6139 grow/shrink: 3/51 up/down: 34547/-2046619 (-2012072)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
---
 arch/arm64/configs/defconfig | 67 ++++++++++++++++++++++----------------------
 1 file changed, 34 insertions(+), 33 deletions(-)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 63d4a0f2e388..7d82e90b0405 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -199,8 +199,8 @@ CONFIG_MAC80211=m
 CONFIG_MAC80211_LEDS=y
 CONFIG_RFKILL=m
 CONFIG_RFKILL_GPIO=m
-CONFIG_NET_9P=y
-CONFIG_NET_9P_VIRTIO=y
+CONFIG_NET_9P=m
+CONFIG_NET_9P_VIRTIO=m
 CONFIG_NFC=m
 CONFIG_NFC_NCI=m
 CONFIG_NFC_NXP_NCI=m
@@ -362,11 +362,14 @@ CONFIG_NET_XGENE=y
 # CONFIG_NET_VENDOR_ARC is not set
 # CONFIG_NET_VENDOR_ASIX is not set
 CONFIG_ATL1C=m
+CONFIG_BCM4908_ENET=m
 CONFIG_BCMGENET=m
 CONFIG_BNX2X=m
+CONFIG_BGMAC_PLATFORM=m
 CONFIG_SYSTEMPORT=m
-CONFIG_MACB=y
-CONFIG_THUNDER_NIC_PF=y
+CONFIG_BCMASP=m
+CONFIG_MACB=m
+CONFIG_THUNDER_NIC_PF=m
 # CONFIG_NET_VENDOR_CHELSIO is not set
 # CONFIG_NET_VENDOR_CISCO is not set
 # CONFIG_NET_VENDOR_CORTINA is not set
@@ -376,33 +379,31 @@ CONFIG_THUNDER_NIC_PF=y
 # CONFIG_NET_VENDOR_EMULEX is not set
 # CONFIG_NET_VENDOR_ENGLEDER is not set
 # CONFIG_NET_VENDOR_EZCHIP is not set
-CONFIG_FEC=y
-CONFIG_FSL_FMAN=y
-CONFIG_FSL_DPAA_ETH=y
-CONFIG_FSL_DPAA2_ETH=y
-CONFIG_FSL_ENETC=y
+CONFIG_FEC=m
+CONFIG_FSL_FMAN=m
+CONFIG_FSL_DPAA_ETH=m
+CONFIG_FSL_DPAA2_ETH=m
+CONFIG_FSL_ENETC=m
 CONFIG_NXP_ENETC4=m
-CONFIG_FSL_ENETC_VF=y
+CONFIG_FSL_ENETC_VF=m
 CONFIG_FSL_ENETC_QOS=y
 CONFIG_NXP_NETC_BLK_CTRL=m
 # CONFIG_NET_VENDOR_FUNGIBLE is not set
 # CONFIG_NET_VENDOR_GOOGLE is not set
-CONFIG_HIX5HD2_GMAC=y
-CONFIG_HNS_DSAF=y
-CONFIG_HNS_ENET=y
-CONFIG_HNS3=y
-CONFIG_HNS3_HCLGE=y
-CONFIG_HNS3_ENET=y
+CONFIG_HIX5HD2_GMAC=m
+CONFIG_HNS_DSAF=m
+CONFIG_HNS_ENET=m
+CONFIG_HNS3=m
 # CONFIG_NET_VENDOR_HUAWEI is not set
-CONFIG_E1000=y
-CONFIG_E1000E=y
+CONFIG_E1000=m
+CONFIG_E1000E=m
 CONFIG_IGB=y
-CONFIG_IGBVF=y
+CONFIG_IGBVF=m
 # CONFIG_NET_VENDOR_ADI is not set
 # CONFIG_NET_VENDOR_LITEX is not set
-CONFIG_MVNETA=y
-CONFIG_MVPP2=y
-CONFIG_SKY2=y
+CONFIG_MVNETA=m
+CONFIG_MVPP2=m
+CONFIG_SKY2=m
 CONFIG_NET_VENDOR_MEDIATEK=y
 CONFIG_NET_MEDIATEK_STAR_EMAC=m
 CONFIG_MLX4_EN=m
@@ -426,27 +427,27 @@ CONFIG_QCOM_EMAC=m
 CONFIG_RMNET=m
 # CONFIG_NET_VENDOR_RDC is not set
 CONFIG_R8169=m
-CONFIG_SH_ETH=y
-CONFIG_RAVB=y
-CONFIG_RENESAS_ETHER_SWITCH=y
-CONFIG_RTSN=y
+CONFIG_SH_ETH=m
+CONFIG_RAVB=m
+CONFIG_RENESAS_ETHER_SWITCH=m
+CONFIG_RTSN=m
 # CONFIG_NET_VENDOR_ROCKER is not set
 # CONFIG_NET_VENDOR_SAMSUNG is not set
 # CONFIG_NET_VENDOR_SEEQ is not set
 # CONFIG_NET_VENDOR_SILAN is not set
 # CONFIG_NET_VENDOR_SIS is not set
 # CONFIG_NET_VENDOR_SOLARFLARE is not set
-CONFIG_SMC91X=y
-CONFIG_SMSC911X=y
-CONFIG_SNI_AVE=y
-CONFIG_SNI_NETSEC=y
+CONFIG_SMC91X=m
+CONFIG_SMSC911X=m
+CONFIG_SNI_AVE=m
+CONFIG_SNI_NETSEC=m
 CONFIG_STMMAC_ETH=m
 CONFIG_DWMAC_MEDIATEK=m
 CONFIG_DWMAC_TEGRA=m
 # CONFIG_NET_VENDOR_SUN is not set
 # CONFIG_NET_VENDOR_SYNOPSYS is not set
 # CONFIG_NET_VENDOR_TEHUTI is not set
-CONFIG_TI_K3_AM65_CPSW_NUSS=y
+CONFIG_TI_K3_AM65_CPSW_NUSS=m
 CONFIG_TI_ICSSG_PRUETH=m
 # CONFIG_NET_VENDOR_VERTEXCOM is not set
 # CONFIG_NET_VENDOR_VIA is not set
@@ -479,7 +480,7 @@ CONFIG_CAN_M_CAN_PLATFORM=m
 CONFIG_CAN_RCAR=m
 CONFIG_CAN_RCAR_CANFD=m
 CONFIG_CAN_MCP251XFD=m
-CONFIG_MDIO_GPIO=y
+CONFIG_MDIO_GPIO=m
 CONFIG_MDIO_BUS_MUX_MULTIPLEXER=y
 CONFIG_MDIO_BUS_MUX_MMIOREG=y
 CONFIG_USB_PEGASUS=m
@@ -1955,7 +1956,7 @@ CONFIG_NFS_V4=y
 CONFIG_NFS_V4_1=y
 CONFIG_NFS_V4_2=y
 CONFIG_ROOT_NFS=y
-CONFIG_9P_FS=y
+CONFIG_9P_FS=m
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ISO8859_1=y
 CONFIG_SECURITY=y

-- 
2.51.0