[OpenWrt-Devel] [PATCH v4 4/4] kernel: 3.18: Strip off all the useless options

Jonas Gorski jogo at openwrt.org
Fri Dec 12 12:45:06 EST 2014 

On Fri, Dec 12, 2014 at 5:02 PM, Maxime Ripard
<maxime.ripard at free-electrons.com> wrote:
> Now that we use the defconfigs, we can remove all the options at their default
> value.

This causes a lot of kernel-config changes for e.g bcm63xx_smp with
3.18, several of which are unwanted (e.g. enabling of the FPU
emulator).

How did you determine which of these symbols were unneeded?

Here a diff of the resulting .config with patches 1-3 applied
(before), and with patch 4 in addition applied (after)

--- config-3.18-before 2014-12-12 18:39:08.385702153 +0100
+++ config-3.18-after   2014-12-12 18:33:58.197708840 +0100
@@ -167,9 +167,9 @@
 # CONFIG_PREEMPT is not set
 # CONFIG_KEXEC is not set
 # CONFIG_CRASH_DUMP is not set
-# CONFIG_SECCOMP is not set
+CONFIG_SECCOMP=y
 CONFIG_MIPS_O32_FP64_SUPPORT=y
-# CONFIG_MIPS_FPU_EMULATOR is not set
+CONFIG_MIPS_FPU_EMULATOR=y
 CONFIG_USE_OF=y
 CONFIG_BOOT_RAW=y
 CONFIG_LOCKDEP_SUPPORT=y
@@ -262,7 +262,7 @@
 # CONFIG_KALLSYMS_UNCOMPRESSED is not set
 CONFIG_BPF=y
 CONFIG_EXPERT=y
-# CONFIG_SGETMASK_SYSCALL is not set
+CONFIG_SGETMASK_SYSCALL=y
 # CONFIG_SYSFS_SYSCALL is not set
 # CONFIG_SYSCTL_SYSCALL is not set
 CONFIG_KALLSYMS=y
@@ -276,7 +276,7 @@
 CONFIG_SIGNALFD=y
 CONFIG_TIMERFD=y
 CONFIG_EVENTFD=y
-CONFIG_BPF_SYSCALL=y
+# CONFIG_BPF_SYSCALL is not set
 CONFIG_SHMEM=y
 # CONFIG_AIO is not set
 # CONFIG_ADVISE_SYSCALLS is not set
@@ -311,6 +311,7 @@
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
+CONFIG_SECCOMP_FILTER=y
 CONFIG_HAVE_CC_STACKPROTECTOR=y
 # CONFIG_CC_STACKPROTECTOR is not set
 CONFIG_CC_STACKPROTECTOR_NONE=y
@@ -406,7 +407,11 @@
 #
 CONFIG_PCIEPORTBUS=y
 # CONFIG_PCIEAER is not set
-# CONFIG_PCIEASPM is not set
+CONFIG_PCIEASPM=y
+# CONFIG_PCIEASPM_DEBUG is not set
+CONFIG_PCIEASPM_DEFAULT=y
+# CONFIG_PCIEASPM_POWERSAVE is not set
+# CONFIG_PCIEASPM_PERFORMANCE is not set
 CONFIG_MMU=y
 # CONFIG_PCCARD is not set
 # CONFIG_HOTPLUG_PCI is not set
@@ -418,7 +423,7 @@
 #
 CONFIG_BINFMT_ELF=y
 CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE=y
-# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
 CONFIG_BINFMT_SCRIPT=y
 # CONFIG_HAVE_AOUT is not set
 # CONFIG_BINFMT_MISC is not set
@@ -528,7 +533,7 @@
 CONFIG_NETFILTER=y
 # CONFIG_NETFILTER_DEBUG is not set
 CONFIG_NETFILTER_ADVANCED=y
-# CONFIG_BRIDGE_NETFILTER is not set
+CONFIG_BRIDGE_NETFILTER=y

 #
 # Core Netfilter Configuration
@@ -636,6 +641,7 @@
 CONFIG_NETFILTER_XT_MATCH_MULTIPORT=m
 # CONFIG_NETFILTER_XT_MATCH_NFACCT is not set
 # CONFIG_NETFILTER_XT_MATCH_OWNER is not set
+# CONFIG_NETFILTER_XT_MATCH_PHYSDEV is not set
 # CONFIG_NETFILTER_XT_MATCH_PKTTYPE is not set
 # CONFIG_NETFILTER_XT_MATCH_QUOTA is not set
 # CONFIG_NETFILTER_XT_MATCH_RATEEST is not set
@@ -657,7 +663,7 @@
 #
 CONFIG_NF_DEFRAG_IPV4=m
 CONFIG_NF_CONNTRACK_IPV4=m
-# CONFIG_NF_CONNTRACK_PROC_COMPAT is not set
+CONFIG_NF_CONNTRACK_PROC_COMPAT=y
 # CONFIG_NF_LOG_ARP is not set
 CONFIG_NF_LOG_IPV4=m
 CONFIG_NF_REJECT_IPV4=m
@@ -966,7 +972,7 @@
 #
 # CONFIG_MTD_LPDDR is not set
 CONFIG_MTD_SPI_NOR=y
-# CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set
+CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y
 # CONFIG_MTD_UBI is not set
 CONFIG_DTC=y
 CONFIG_OF=y
@@ -1201,7 +1207,9 @@
 # CONFIG_FORCEDETH is not set
 CONFIG_NET_VENDOR_OKI=y
 # CONFIG_ETHOC is not set
-# CONFIG_NET_PACKET_ENGINE is not set
+CONFIG_NET_PACKET_ENGINE=y
+# CONFIG_HAMACHI is not set
+# CONFIG_YELLOWFIN is not set
 CONFIG_NET_VENDOR_QLOGIC=y
 # CONFIG_QLA3XXX is not set
 # CONFIG_QLCNIC is not set
@@ -1304,9 +1312,9 @@
 CONFIG_PPP=m
 # CONFIG_PPP_BSDCOMP is not set
 # CONFIG_PPP_DEFLATE is not set
-CONFIG_PPP_FILTER=y
+# CONFIG_PPP_FILTER is not set
 # CONFIG_PPP_MPPE is not set
-CONFIG_PPP_MULTILINK=y
+# CONFIG_PPP_MULTILINK is not set
 CONFIG_PPPOE=m
 CONFIG_PPP_ASYNC=m
 # CONFIG_PPP_SYNC_TTY is not set
@@ -1345,7 +1353,10 @@
 #
 # Userland interfaces
 #
-# CONFIG_INPUT_MOUSEDEV is not set
+CONFIG_INPUT_MOUSEDEV=m
+CONFIG_INPUT_MOUSEDEV_PSAUX=y
+CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
+CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
 # CONFIG_INPUT_JOYDEV is not set
 # CONFIG_INPUT_EVDEV is not set
 # CONFIG_INPUT_EVBUG is not set
@@ -1354,7 +1365,7 @@
 # Input Device Drivers
 #
 CONFIG_INPUT_KEYBOARD=y
-# CONFIG_KEYBOARD_ATKBD is not set
+CONFIG_KEYBOARD_ATKBD=m
 # CONFIG_KEYBOARD_LKKBD is not set
 # CONFIG_KEYBOARD_GPIO is not set
 CONFIG_KEYBOARD_GPIO_POLLED=m
@@ -1366,29 +1377,41 @@
 # CONFIG_KEYBOARD_SUNKBD is not set
 # CONFIG_KEYBOARD_OMAP4 is not set
 # CONFIG_KEYBOARD_XTKBD is not set
-# CONFIG_INPUT_MOUSE is not set
+CONFIG_INPUT_MOUSE=y
+CONFIG_MOUSE_PS2=m
+CONFIG_MOUSE_PS2_ALPS=y
+CONFIG_MOUSE_PS2_LOGIPS2PP=y
+CONFIG_MOUSE_PS2_SYNAPTICS=y
+CONFIG_MOUSE_PS2_CYPRESS=y
+CONFIG_MOUSE_PS2_TRACKPOINT=y
+# CONFIG_MOUSE_PS2_ELANTECH is not set
+# CONFIG_MOUSE_PS2_SENTELIC is not set
+# CONFIG_MOUSE_PS2_TOUCHKIT is not set
+# CONFIG_MOUSE_SERIAL is not set
+# CONFIG_MOUSE_APPLETOUCH is not set
+# CONFIG_MOUSE_BCM5974 is not set
+# CONFIG_MOUSE_VSXXXAA is not set
+# CONFIG_MOUSE_GPIO is not set
+# CONFIG_MOUSE_SYNAPTICS_USB is not set
 # CONFIG_INPUT_JOYSTICK is not set
 # CONFIG_INPUT_TABLET is not set
 # CONFIG_INPUT_TOUCHSCREEN is not set
-CONFIG_INPUT_MISC=y
-# CONFIG_INPUT_AD714X is not set
-# CONFIG_INPUT_GPIO_BEEPER is not set
-# CONFIG_INPUT_GPIO_TILT_POLLED is not set
-# CONFIG_INPUT_ATI_REMOTE2 is not set
-# CONFIG_INPUT_KEYSPAN_REMOTE is not set
-# CONFIG_INPUT_POWERMATE is not set
-# CONFIG_INPUT_YEALINK is not set
-# CONFIG_INPUT_CM109 is not set
-# CONFIG_INPUT_UINPUT is not set
-# CONFIG_INPUT_GPIO_ROTARY_ENCODER is not set
-# CONFIG_INPUT_ADXL34X is not set
-# CONFIG_INPUT_CMA3000 is not set
+# CONFIG_INPUT_MISC is not set

 #
 # Hardware I/O ports
 #
-# CONFIG_SERIO is not set
+CONFIG_SERIO=m
 CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
+CONFIG_SERIO_I8042=m
+CONFIG_SERIO_SERPORT=m
+# CONFIG_SERIO_PCIPS2 is not set
+CONFIG_SERIO_LIBPS2=m
+# CONFIG_SERIO_RAW is not set
+# CONFIG_SERIO_ALTERA_PS2 is not set
+# CONFIG_SERIO_PS2MULT is not set
+# CONFIG_SERIO_ARC_PS2 is not set
+# CONFIG_SERIO_APBPS2 is not set
 # CONFIG_GAMEPORT is not set

 #
@@ -1636,7 +1659,8 @@
 #
 # Graphics support
 #
-# CONFIG_VGA_ARB is not set
+CONFIG_VGA_ARB=y
+CONFIG_VGA_ARB_MAX_GPUS=16

 #
 # Direct Rendering Manager
@@ -1942,7 +1966,7 @@
 # Compile-time checks and compiler options
 #
 CONFIG_DEBUG_INFO=y
-CONFIG_DEBUG_INFO_REDUCED=y
+# CONFIG_DEBUG_INFO_REDUCED is not set
 # CONFIG_DEBUG_INFO_SPLIT is not set
 # CONFIG_DEBUG_INFO_DWARF4 is not set
 CONFIG_ENABLE_WARN_DEPRECATED=y
@@ -2015,7 +2039,7 @@
 # CONFIG_SPARSE_RCU_POINTER is not set
 # CONFIG_TORTURE_TEST is not set
 # CONFIG_RCU_TORTURE_TEST is not set
-CONFIG_RCU_CPU_STALL_TIMEOUT=60
+CONFIG_RCU_CPU_STALL_TIMEOUT=21
 # CONFIG_RCU_CPU_STALL_INFO is not set
 # CONFIG_RCU_TRACE is not set
 # CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
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