Message-Id: <20200502233910.20851-1-clay@daemons.net>
Date:   Sat,  2 May 2020 16:39:04 -0700
From:   Clay McClure <clay@...mons.net>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Clay McClure <clay@...mons.net>, Arnd Bergmann <arnd@...db.de>,
        Grygorii Strashko <grygorii.strashko@...com>,
        kbuild test robot <lkp@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Lindgren <tony@...mide.com>,
        "David S. Miller" <davem@...emloft.net>,
        Wingman Kwok <w-kwok2@...com>,
        Murali Karicheri <m-karicheri2@...com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Dinh Nguyen <dinguyen@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Kees Cook <keescook@...omium.org>,
        Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] net: ethernet: ti: Remove TI_CPTS_MOD workaround

My recent commit b6d49cab44b5 ("net: Make PTP-specific drivers depend on PTP_1588_CLOCK")
exposes a missing dependency in defconfigs that select TI_CPTS without
selecting PTP_1588_CLOCK, leading to linker errors of the form:

drivers/net/ethernet/ti/cpsw.o: in function `cpsw_ndo_stop':
cpsw.c:(.text+0x680): undefined reference to `cpts_unregister'
drivers/net/ethernet/ti/cpsw.o: in function `cpsw_remove':
cpsw.c:(.text+0x81c): undefined reference to `cpts_release'
drivers/net/ethernet/ti/cpsw.o: in function `cpsw_rx_handler':
cpsw.c:(.text+0x1324): undefined reference to `cpts_rx_timestamp'
drivers/net/ethernet/ti/cpsw.o: in function `cpsw_ndo_open':
cpsw.c:(.text+0x15ec): undefined reference to `cpts_register'
drivers/net/ethernet/ti/cpsw.o: in function `cpsw_probe':
cpsw.c:(.text+0x2468): undefined reference to `cpts_release'

That's because TI_CPTS_MOD (which is the symbol gating the _compilation_
of cpts.c) now depends on PTP_1588_CLOCK, and so is not enabled in these
configurations, but TI_CPTS (which is the symbol gating _calls_ to the
cpts functions) _is_ enabled. So we end up compiling calls to functions
that don't exist, resulting in the linker errors.

The reason we have two symbols (TI_CPTS and TI_CPTS_MOD) for the same
driver is due to commit be9ca0d33c85 ("cpsw/netcp: work around reverse
cpts dependency"), which introduced TI_CPTS_MOD because (quoting the
commit message):

> The dependency is reversed: cpsw and netcp call into cpts,
> but cpts depends on the other two in Kconfig. This can lead
> to cpts being a loadable module and its callers built-in:
>
> drivers/net/ethernet/ti/cpsw.o: In function `cpsw_remove':
> cpsw.c:(.text.cpsw_remove+0xd0): undefined reference to `cpts_release'
> drivers/net/ethernet/ti/cpsw.o: In function `cpsw_rx_handler':
> cpsw.c:(.text.cpsw_rx_handler+0x2dc): undefined reference to `cpts_rx_timestamp'
> drivers/net/ethernet/ti/cpsw.o: In function `cpsw_tx_handler':
> cpsw.c:(.text.cpsw_tx_handler+0x7c): undefined reference to `cpts_tx_timestamp'
> drivers/net/ethernet/ti/cpsw.o: In function `cpsw_ndo_stop':

Both forms of linker error -- those caused by defconfigs that select
TI_CPTS without PTP_1588_CLOCK and those caused by configuring TI_CPSW
as a built-in and TI_CPTS as a module -- can be avoided by using the
IS_REACHABLE() macro to gate calls to cpts functions, and using the
TI_CPTS symbol to gate compilation of cpts.c. cpts.h already provides
the no-op stub implementations of the cpts functions required to make
this work, we just need to change the existing IS_ENABLED(TI_CPTS)
guards to IS_REACHABLE(TI_CPTS).

With this change there is no longer any need for the TI_CPTS_MOD symbol,
so we can remove it.

To preserve the existing behavior of defconfigs that select TI_CPTS, we
must also select PTP_1588_CLOCK so that the dependency is satisfied.
omap2plus_defconfig and keystone_defconfig have not been updated in a
while, so some unrelated no-op changes appear in the diff.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Grygorii Strashko <grygorii.strashko@...com>
Fixes: b6d49cab44b5 ("net: Make PTP-specific drivers depend on PTP_1588_CLOCK")
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Clay McClure <clay@...mons.net>
---
 arch/arm/configs/keystone_defconfig    | 72 ++++++++++++--------------
 arch/arm/configs/omap2plus_defconfig   |  3 +-
 drivers/net/ethernet/ti/Kconfig        | 13 ++---
 drivers/net/ethernet/ti/Makefile       |  2 +-
 drivers/net/ethernet/ti/cpsw_ethtool.c |  2 +-
 drivers/net/ethernet/ti/cpts.h         |  3 +-
 drivers/net/ethernet/ti/netcp_ethss.c  | 10 ++--
 7 files changed, 45 insertions(+), 60 deletions(-)

diff --git a/arch/arm/configs/keystone_defconfig b/arch/arm/configs/keystone_defconfig
index 11e2211f9007..a66c37efa15b 100644
--- a/arch/arm/configs/keystone_defconfig
+++ b/arch/arm/configs/keystone_defconfig
@@ -1,44 +1,41 @@
 # CONFIG_SWAP is not set
 CONFIG_POSIX_MQUEUE=y
 CONFIG_HIGH_RES_TIMERS=y
+CONFIG_PREEMPT=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_LOG_BUF_SHIFT=14
 CONFIG_CGROUPS=y
+CONFIG_BLK_CGROUP=y
+CONFIG_CGROUP_SCHED=y
 CONFIG_CGROUP_FREEZER=y
 CONFIG_CGROUP_DEVICE=y
 CONFIG_CGROUP_CPUACCT=y
-CONFIG_CGROUP_SCHED=y
-CONFIG_BLK_CGROUP=y
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_KALLSYMS_ALL=y
 # CONFIG_ELF_CORE is not set
 # CONFIG_BASE_FULL is not set
+CONFIG_KALLSYMS_ALL=y
 CONFIG_EMBEDDED=y
 CONFIG_PROFILING=y
-CONFIG_OPROFILE=y
-CONFIG_KPROBES=y
-CONFIG_MODULES=y
-CONFIG_MODULE_FORCE_LOAD=y
-CONFIG_MODULE_UNLOAD=y
-CONFIG_MODULE_FORCE_UNLOAD=y
-CONFIG_MODVERSIONS=y
 CONFIG_ARCH_KEYSTONE=y
 CONFIG_ARM_LPAE=y
-CONFIG_PCI=y
-CONFIG_PCI_MSI=y
-CONFIG_PCI_KEYSTONE=y
 CONFIG_SMP=y
 CONFIG_HOTPLUG_CPU=y
 CONFIG_ARM_PSCI=y
-CONFIG_PREEMPT=y
-CONFIG_AEABI=y
 CONFIG_HIGHMEM=y
-CONFIG_CMA=y
 CONFIG_VFP=y
 CONFIG_NEON=y
 # CONFIG_SUSPEND is not set
 CONFIG_PM=y
+CONFIG_TI_SCI_PROTOCOL=y
+CONFIG_OPROFILE=y
+CONFIG_KPROBES=y
+CONFIG_MODULES=y
+CONFIG_MODULE_FORCE_LOAD=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_MODULE_FORCE_UNLOAD=y
+CONFIG_MODVERSIONS=y
+CONFIG_CMA=y
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y
@@ -65,9 +62,6 @@ CONFIG_IP_MROUTE_MULTIPLE_TABLES=y
 CONFIG_IP_PIMSM_V2=y
 CONFIG_INET_AH=y
 CONFIG_INET_IPCOMP=y
-CONFIG_INET6_XFRM_MODE_TRANSPORT=m
-CONFIG_INET6_XFRM_MODE_TUNNEL=m
-CONFIG_INET6_XFRM_MODE_BEET=m
 CONFIG_IPV6_SIT=m
 CONFIG_IPV6_MULTIPLE_TABLES=y
 CONFIG_IPV6_SUBTREES=y
@@ -93,7 +87,6 @@ CONFIG_NETFILTER_XT_MATCH_MARK=y
 CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
 CONFIG_NETFILTER_XT_MATCH_PKTTYPE=y
 CONFIG_NETFILTER_XT_MATCH_STATE=y
-CONFIG_NF_CONNTRACK_IPV4=y
 CONFIG_IP_NF_IPTABLES=y
 CONFIG_IP_NF_MATCH_AH=y
 CONFIG_IP_NF_MATCH_ECN=y
@@ -114,17 +107,18 @@ CONFIG_VLAN_8021Q=y
 CONFIG_CAN=m
 CONFIG_CAN_C_CAN=m
 CONFIG_CAN_C_CAN_PLATFORM=m
+CONFIG_PCI=y
+CONFIG_PCI_MSI=y
 CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
-CONFIG_DMA_CMA=y
 CONFIG_MTD=y
 CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_BLOCK=y
 CONFIG_MTD_PLATRAM=y
-CONFIG_MTD_M25P80=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_MTD_NAND_DAVINCI=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_SPI_CADENCE_QUADSPI=y
 CONFIG_MTD_UBI=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_SRAM=y
@@ -134,8 +128,12 @@ CONFIG_BLK_DEV_SD=y
 CONFIG_NETDEVICES=y
 CONFIG_TI_KEYSTONE_NETCP=y
 CONFIG_TI_KEYSTONE_NETCP_ETHSS=y
-CONFIG_TI_CPTS=y
+CONFIG_DP83867_PHY=y
 CONFIG_MARVELL_PHY=y
+CONFIG_MICREL_PHY=y
+CONFIG_INPUT_EVDEV=m
+CONFIG_INPUT_MISC=y
+CONFIG_INPUT_GPIO_DECODER=m
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_OF_PLATFORM=y
@@ -147,14 +145,16 @@ CONFIG_I2C_DAVINCI=y
 CONFIG_SPI=y
 CONFIG_SPI_DAVINCI=y
 CONFIG_SPI_SPIDEV=y
+CONFIG_PTP_1588_CLOCK=y
 CONFIG_PINCTRL_SINGLE=y
 CONFIG_GPIOLIB=y
 CONFIG_GPIO_SYSFS=y
 CONFIG_GPIO_DAVINCI=y
 CONFIG_GPIO_SYSCON=y
-CONFIG_POWER_SUPPLY=y
+CONFIG_GPIO_PCA953X=m
 CONFIG_POWER_RESET=y
 CONFIG_POWER_RESET_KEYSTONE=y
+CONFIG_POWER_SUPPLY=y
 # CONFIG_HWMON is not set
 CONFIG_WATCHDOG=y
 CONFIG_DAVINCI_WATCHDOG=y
@@ -166,8 +166,8 @@ CONFIG_USB_MON=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_DWC3=y
-CONFIG_NOP_USB_XCEIV=y
 CONFIG_KEYSTONE_USB_PHY=y
+CONFIG_NOP_USB_XCEIV=y
 CONFIG_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_PLTFM=y
@@ -180,9 +180,10 @@ CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_ONESHOT=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
 CONFIG_LEDS_TRIGGER_BACKLIGHT=y
+CONFIG_LEDS_TRIGGER_CPU=y
+CONFIG_LEDS_TRIGGER_ACTIVITY=y
 CONFIG_LEDS_TRIGGER_GPIO=y
 CONFIG_DMADEVICES=y
-CONFIG_TI_EDMA=y
 CONFIG_MAILBOX=y
 CONFIG_TI_MESSAGE_MANAGER=y
 CONFIG_SOC_TI=y
@@ -196,7 +197,6 @@ CONFIG_PWM_TIECAP=m
 CONFIG_KEYSTONE_IRQ=y
 CONFIG_RESET_TI_SCI=m
 CONFIG_RESET_TI_SYSCON=m
-CONFIG_TI_SCI_PROTOCOL=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_FANOTIFY=y
@@ -217,10 +217,6 @@ CONFIG_NFSD_V3=y
 CONFIG_NFSD_V3_ACL=y
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ISO8859_1=y
-CONFIG_PRINTK_TIME=y
-CONFIG_DEBUG_INFO=y
-CONFIG_DEBUG_SHIRQ=y
-CONFIG_DEBUG_USER=y
 CONFIG_CRYPTO_USER=y
 CONFIG_CRYPTO_AUTHENC=y
 CONFIG_CRYPTO_CBC=y
@@ -230,12 +226,8 @@ CONFIG_CRYPTO_DES=y
 CONFIG_CRYPTO_ANSI_CPRNG=y
 CONFIG_CRYPTO_USER_API_HASH=y
 CONFIG_CRYPTO_USER_API_SKCIPHER=y
-CONFIG_SPI_CADENCE_QUADSPI=y
-CONFIG_INPUT_MISC=y
-CONFIG_INPUT_EVDEV=m
-CONFIG_INPUT_GPIO_DECODER=m
-CONFIG_GPIO_PCA953X=m
-CONFIG_LEDS_TRIGGER_ACTIVITY=y
-CONFIG_LEDS_TRIGGER_CPU=y
-CONFIG_MICREL_PHY=y
-CONFIG_DP83867_PHY=y
+CONFIG_DMA_CMA=y
+CONFIG_PRINTK_TIME=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_SHIRQ=y
+CONFIG_DEBUG_USER=y
diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig
index 3cc3ca5fa027..e00f0d871c53 100644
--- a/arch/arm/configs/omap2plus_defconfig
+++ b/arch/arm/configs/omap2plus_defconfig
@@ -57,7 +57,6 @@ CONFIG_CPUFREQ_DT=m
 CONFIG_ARM_TI_CPUFREQ=y
 CONFIG_CPU_IDLE=y
 CONFIG_ARM_CPUIDLE=y
-CONFIG_DT_IDLE_STATES=y
 CONFIG_KERNEL_MODE_NEON=y
 CONFIG_PM_DEBUG=y
 CONFIG_ARM_CRYPTO=y
@@ -189,7 +188,6 @@ CONFIG_SMSC911X=y
 CONFIG_TI_DAVINCI_EMAC=y
 CONFIG_TI_CPSW=y
 CONFIG_TI_CPSW_SWITCHDEV=y
-CONFIG_TI_CPTS=y
 # CONFIG_NET_VENDOR_VIA is not set
 # CONFIG_NET_VENDOR_WIZNET is not set
 CONFIG_DP83848_PHY=y
@@ -274,6 +272,7 @@ CONFIG_SPI_TI_QSPI=m
 CONFIG_HSI=m
 CONFIG_OMAP_SSI=m
 CONFIG_SSI_PROTOCOL=m
+CONFIG_PTP_1588_CLOCK=y
 CONFIG_PINCTRL_SINGLE=y
 CONFIG_DEBUG_GPIO=y
 CONFIG_GPIO_SYSFS=y
diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index 8e348780efb6..f3f8bb724294 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -77,23 +77,18 @@ config TI_CPSW_SWITCHDEV
 	  will be called cpsw_new.
 
 config TI_CPTS
-	bool "TI Common Platform Time Sync (CPTS) Support"
+	tristate "TI Common Platform Time Sync (CPTS) Support"
 	depends on TI_CPSW || TI_KEYSTONE_NETCP || TI_CPSW_SWITCHDEV || COMPILE_TEST
 	depends on COMMON_CLK
-	depends on POSIX_TIMERS
+	depends on PTP_1588_CLOCK
+	default y if TI_CPSW=y || TI_KEYSTONE_NETCP=y || TI_CPSW_SWITCHDEV=y
+	default m
 	---help---
 	  This driver supports the Common Platform Time Sync unit of
 	  the CPSW Ethernet Switch and Keystone 2 1g/10g Switch Subsystem.
 	  The unit can time stamp PTP UDP/IPv4 and Layer 2 packets, and the
 	  driver offers a PTP Hardware Clock.
 
-config TI_CPTS_MOD
-	tristate
-	depends on TI_CPTS
-	depends on PTP_1588_CLOCK
-	default y if TI_CPSW=y || TI_KEYSTONE_NETCP=y || TI_CPSW_SWITCHDEV=y
-	default m
-
 config TI_K3_AM65_CPSW_NUSS
 	tristate "TI K3 AM654x/J721E CPSW Ethernet driver"
 	depends on ARCH_K3 && OF && TI_K3_UDMA_GLUE_LAYER
diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
index 53792190e9c2..cb26a9d21869 100644
--- a/drivers/net/ethernet/ti/Makefile
+++ b/drivers/net/ethernet/ti/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_TI_DAVINCI_EMAC) += ti_davinci_emac.o
 ti_davinci_emac-y := davinci_emac.o davinci_cpdma.o
 obj-$(CONFIG_TI_DAVINCI_MDIO) += davinci_mdio.o
 obj-$(CONFIG_TI_CPSW_PHY_SEL) += cpsw-phy-sel.o
-obj-$(CONFIG_TI_CPTS_MOD) += cpts.o
+obj-$(CONFIG_TI_CPTS) += cpts.o
 obj-$(CONFIG_TI_CPSW) += ti_cpsw.o
 ti_cpsw-y := cpsw.o davinci_cpdma.o cpsw_ale.o cpsw_priv.o cpsw_sl.o cpsw_ethtool.o
 obj-$(CONFIG_TI_CPSW_SWITCHDEV) += ti_cpsw_new.o
diff --git a/drivers/net/ethernet/ti/cpsw_ethtool.c b/drivers/net/ethernet/ti/cpsw_ethtool.c
index fa54efe3be63..19a7370a4188 100644
--- a/drivers/net/ethernet/ti/cpsw_ethtool.c
+++ b/drivers/net/ethernet/ti/cpsw_ethtool.c
@@ -709,7 +709,7 @@ int cpsw_set_ringparam(struct net_device *ndev,
 	return ret;
 }
 
-#if IS_ENABLED(CONFIG_TI_CPTS)
+#if IS_REACHABLE(CONFIG_TI_CPTS)
 int cpsw_get_ts_info(struct net_device *ndev, struct ethtool_ts_info *info)
 {
 	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index bb997c11ee15..782e24c78e7a 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h
@@ -8,7 +8,7 @@
 #ifndef _TI_CPTS_H_
 #define _TI_CPTS_H_
 
-#if IS_ENABLED(CONFIG_TI_CPTS)
+#if IS_REACHABLE(CONFIG_TI_CPTS)
 
 #include <linux/clk.h>
 #include <linux/clkdev.h>
@@ -171,5 +171,4 @@ static inline bool cpts_can_timestamp(struct cpts *cpts, struct sk_buff *skb)
 }
 #endif
 
-
 #endif
diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index fb36115e9c51..3de1d25128b7 100644
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -181,7 +181,7 @@
 
 #define HOST_TX_PRI_MAP_DEFAULT			0x00000000
 
-#if IS_ENABLED(CONFIG_TI_CPTS)
+#if IS_REACHABLE(CONFIG_TI_CPTS)
 /* Px_TS_CTL register fields */
 #define TS_RX_ANX_F_EN				BIT(0)
 #define TS_RX_VLAN_LT1_EN			BIT(1)
@@ -2000,7 +2000,7 @@ static int keystone_set_link_ksettings(struct net_device *ndev,
 	return phy_ethtool_ksettings_set(phy, cmd);
 }
 
-#if IS_ENABLED(CONFIG_TI_CPTS)
+#if IS_REACHABLE(CONFIG_TI_CPTS)
 static int keystone_get_ts_info(struct net_device *ndev,
 				struct ethtool_ts_info *info)
 {
@@ -2532,7 +2532,7 @@ static int gbe_del_vid(void *intf_priv, int vid)
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_TI_CPTS)
+#if IS_REACHABLE(CONFIG_TI_CPTS)
 
 static void gbe_txtstamp(void *context, struct sk_buff *skb)
 {
@@ -2977,7 +2977,7 @@ static int gbe_close(void *intf_priv, struct net_device *ndev)
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_TI_CPTS)
+#if IS_REACHABLE(CONFIG_TI_CPTS)
 static void init_slave_ts_ctl(struct gbe_slave *slave)
 {
 	slave->ts_ctl.uni = 1;
@@ -3718,7 +3718,7 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
 
 	gbe_dev->cpts = cpts_create(gbe_dev->dev, gbe_dev->cpts_reg, cpts_node);
 	of_node_put(cpts_node);
-	if (IS_ENABLED(CONFIG_TI_CPTS) && IS_ERR(gbe_dev->cpts)) {
+	if (IS_REACHABLE(CONFIG_TI_CPTS) && IS_ERR(gbe_dev->cpts)) {
 		ret = PTR_ERR(gbe_dev->cpts);
 		goto free_sec_ports;
 	}
-- 
2.20.1

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