hby <hby2003@xxxxxxx> wrote: > The steps: > 1. add "#define DEBUG" in drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c line 61. > 2. make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=../Out_Linux bcm2835_defconfig > 3. make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=../Out_Linux/ zImage modules dtbs -j8 > > Then, it will fail, the compile log described below: > > Kernel: arch/arm/boot/zImage is ready > MODPOST Module.symvers > ERROR: modpost: "brcmf_debugfs_add_entry" [drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko] undefined! > ERROR: modpost: "brcmf_debugfs_get_devdir" [drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko] undefined! > ERROR: modpost: "__brcmf_dbg" [drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko] undefined! > scripts/Makefile.modpost:111: recipe for target 'Module.symvers' failed > make[2]: *** [Module.symvers] Error 1 > make[2]: *** Deleting file 'Module.symvers' > Makefile:1390: recipe for target 'modules' failed > make[1]: *** [modules] Error 2 > make[1]: Leaving directory '/home/hby/gitee/linux_origin/Out_Linux' > Makefile:185: recipe for target '__sub-make' failed > make: *** [__sub-make] Error 2 > > Signed-off-by: hby <hby2003@xxxxxxx> I checked and brcmd80211/Makefile has: subdir-ccflags-$(CONFIG_BRCMDBG) += -DDEBUG I don't understand why brcm80211 uses DEBUG flag like that, but I guess there's a reason. I think that either _all_ DEBUG uses should be removed from the driver, or you shouldn't add "#define DEBUG" on your own to any of the files. So this patch is not the best solution. -- https://patchwork.kernel.org/project/linux-wireless/patch/20201124142440.67554-1-hby2003@xxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
