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--- Begin Message ---both ath9k and ath10k use the kernel's relay framework to pass spectral data to userspace. However, both drivers only have this option enabled if the driver's debugfs option is enabled as well. In case of ath10k_*, the relayfs dependency can be moved to the config ATH_DEBUG symbol. ath9k needed more work. A patch to the ath9k driver was added to detangle RELAY and DEBUG_FS: "ath9k: move RELAY and DEBUG_FS to ATH9K[_HTC]_DEBUGFS" <https://patchwork.kernel.org/patch/9501361/>. NB: CONFIG_PACKAGE_MAC80211_DEBUGFS needs to be disabled to notice the change. Signed-off-by: Christian Lamparter <chunk...@googlemail.com> --- Here are some numbers for my WD Range Extender (AR7370 with a AR9300): For both configurations MAC80211_DEBUGFS and ATH_DEBUG is disabled. (if they are enabled, there should be no change). All sizes are in bytes. And I only test with or without the patch applied. module | file size | .text size | ath9k_common.ko (w/o) | 32208 | 12832 | ath9k_common.ko (with) | 12204 | 3456 | Note: The kernel with the patch, doesn't need RELAY support anymore. Therefore it shrinks a bit as well. | lzma uimage size | .text size | 4.4 kernel (w/o) | 1181777 | 3004592 | 4.4 kernel (with) | 1179666 | 2999448 | If anyone wants to play with it, I made a test-patch For LEDE [0]. Just remember to disable CONFIG_PACKAGE_MAC80211_DEBUGFS and CONFIG_PACKAGE_ATH_DEBUG. The main motivation was that relayfs can be very costly on the RAM as well (on ath10k in can eat like 4MiB per device with VM debugging etc...). --- package/kernel/mac80211/Makefile | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/package/kernel/mac80211/Makefile b/package/kernel/mac80211/Makefile index 5a591e4b83..cb709c85d2 100644 --- a/package/kernel/mac80211/Makefile +++ b/package/kernel/mac80211/Makefile @@ -173,6 +173,7 @@ define KernelPackage/ath/config config PACKAGE_ATH_DEBUG bool "Atheros wireless debugging" + select KERNEL_RELAY help Say Y, if you want to debug atheros wireless drivers. Only ath9k & ath10k make use of this. @@ -220,7 +221,7 @@ define KernelPackage/ath9k-common TITLE:=Atheros 802.11n wireless devices (common code for ath9k and ath9k_htc) URL:=https://wireless.wiki.kernel.org/en/users/drivers/ath9k HIDDEN:=1 - DEPENDS+= @PCI_SUPPORT||USB_SUPPORT||TARGET_ar71xx +kmod-ath +@DRIVER_11N_SUPPORT +@DRIVER_11W_SUPPORT +@KERNEL_RELAY + DEPENDS+= @PCI_SUPPORT||USB_SUPPORT||TARGET_ar71xx +kmod-ath +@DRIVER_11N_SUPPORT +@DRIVER_11W_SUPPORT FILES:= \ $(PKG_BUILD_DIR)/drivers/net/wireless/ath/ath9k/ath9k_common.ko \ $(PKG_BUILD_DIR)/drivers/net/wireless/ath/ath9k/ath9k_hw.ko @@ -277,7 +278,7 @@ define KernelPackage/ath10k $(call KernelPackage/mac80211/Default) TITLE:=Atheros 802.11ac wireless cards support URL:=https://wireless.wiki.kernel.org/en/users/Drivers/ath10k - DEPENDS+= @PCI_SUPPORT +kmod-ath +@DRIVER_11N_SUPPORT +@DRIVER_11AC_SUPPORT +@DRIVER_11W_SUPPORT +@KERNEL_RELAY + DEPENDS+= @PCI_SUPPORT +kmod-ath +@DRIVER_11N_SUPPORT +@DRIVER_11AC_SUPPORT +@DRIVER_11W_SUPPORT FILES:= \ $(PKG_BUILD_DIR)/drivers/net/wireless/ath/ath10k/ath10k_core.ko \ $(PKG_BUILD_DIR)/drivers/net/wireless/ath/ath10k/ath10k_pci.ko @@ -1476,9 +1477,6 @@ ifdef CONFIG_PACKAGE_MAC80211_DEBUGFS config-y += \ CFG80211_DEBUGFS \ MAC80211_DEBUGFS \ - ATH9K_DEBUGFS \ - ATH9K_HTC_DEBUGFS \ - ATH10K_DEBUGFS \ CARL9170_DEBUGFS \ ATH5K_DEBUG endif @@ -1498,7 +1496,7 @@ config-$(call config_package,lib80211) += LIB80211 LIB80211_CRYPT_WEP LIB80211_C config-$(call config_package,airo) += AIRO config-$(call config_package,ath) += ATH_CARDS ATH_COMMON -config-$(CONFIG_PACKAGE_ATH_DEBUG) += ATH_DEBUG ATH10K_DEBUG ATH9K_STATION_STATISTICS +config-$(CONFIG_PACKAGE_ATH_DEBUG) += ATH_DEBUG ATH10K_DEBUG ATH9K_DEBUGFS ATH9K_HTC_DEBUGFS ATH9K_STATION_STATISTICS config-$(CONFIG_PACKAGE_ATH_DFS) += ATH9K_DFS_CERTIFIED ATH10K_DFS_CERTIFIED config-$(call config_package,ath9k) += ATH9K -- 2.11.0
--- End Message ---
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