[PATCH v2] brmcfmac: fix compile when DEBUG is defined

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 <redacted>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
index 4146faeed..c2eb3aa67 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h

@@ -60,7 +60,7 @@ void __brcmf_err(struct brcmf_bus *bus, const char *func, const char *fmt, ...);
 				  ##__VA_ARGS__);			\
 	} while (0)
 
-#if defined(DEBUG) || defined(CONFIG_BRCM_TRACING)
+#if defined(CONFIG_BRCM_TRACING) || defined(CONFIG_BRCMDBG)
 
 /* For debug/tracing purposes treat info messages as errors */
 #define brcmf_info brcmf_err

@@ -114,7 +114,7 @@ extern int brcmf_msg_level;
 
 struct brcmf_bus;
 struct brcmf_pub;
-#ifdef DEBUG
+#if defined(CONFIG_BRCMDBG)
 struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr);
 void brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
 			     int (*read_fn)(struct seq_file *seq, void *data));

-- 
2.17.1

hby [off-list ref] 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 <redacted>

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@163.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches