rk3568 linux sdk修改内核配置后编译报错，发现存在未开源的文件
在修改内核配置后，编译报错，发现是kernel/drivers/spi/spi-wk2xxx这个文件不是源码引起的，请修复一下。
MODPOST vmlinux.o
drivers/spi/spi-wk2xxx: In function `wk2xxx_set_mctrl':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:828: undefined reference to `_mcount'
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:828:(.text+0xc): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_get_mctrl':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:835: undefined reference to `_mcount'
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:835:(.text+0x24): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_enable_ms':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:958: undefined reference to `_mcount'
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:958:(.text+0x40): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_break_ctl':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:968: undefined reference to `_mcount'
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:968:(.text+0x58): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_type':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1460: undefined reference to `_mcount'
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1460:(.text+0x78): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx:/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1505: more undefined references to `_mcount' follow
drivers/spi/spi-wk2xxx: In function `wk2xxx_verify_port':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1505:(.text+0xbc): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_request_port':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1479:(.text+0x120): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_config_port':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1488:(.text+0x154): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_release_port':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1471:(.text+0x188): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_remove':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:1750:(.text+0x1bc): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `_mcount'
drivers/spi/spi-wk2xxx: In function `wk2xxx_dowork':
/home/llq/p/proj/rk3568/kernel/drivers/spi/spi-wk2xxx.c:266:(.text+0x248): additional relocation overflows omitted from the output
drivers/spi/spi-wk2xxx: In function `kmalloc':
/home/llq/p/proj/rk3568/kernel/./include/linux/slab.h:548: undefined reference to `kmem_cache_alloc_trace'
drivers/spi/spi-wk2xxx: In function `wk2xxx_tx_empty':
看了一下,3566 3568 linux和android sdk中都存在固件，都会有修改配置无法编译的风险 这个是你裁剪配置项造成的。
就拿undefined reference to `kmem_cache_alloc_trace'
在连接文件的时候找不到这个定义，你看看mm/slab.c这个文件是不是被你裁剪了config，造成没有被链接到。
mm/slab.c:kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size)
mm/slab.c:EXPORT_SYMBOL(kmem_cache_alloc_trace);
mm/slub.c:void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
mm/slub.c:EXPORT_SYMBOL(kmem_cache_alloc_trace);
还有这个undefined reference to `_mcount'
arch/arm64/kernel/arm64ksyms.c:EXPORT_SYMBOL(_mcount);
arch/arm64/kernel/arm64ksyms.c:NOKPROBE_SYMBOL(_mcount);
895816513 发表于 2022-10-13 16:46
这个是你裁剪配置项造成的。
我看了一下，应该是kernel/drivers/spi/spi-wk2xxx这个文件没有开源导致的， 这个文件原来是带有ftrace开关进行编译的，我现在需要关闭ftrace开关，然后内核链接这个文件就出问题，_mcount是因为ftrace开关导致的。kernel/drivers/spi/spi-wk2xxx这个可以开发出来吗，我的理解linux内核是gpl的，内核的修改是可以开源出来的，另外还有drivers/mmc/core/mmc_blk_data这也是闭源的，也会引起同样的问题，如果把这2个镜像从makefile中去掉，编译就可以过，但是这2个模块不清楚是啥作用，贸然删掉会不会引起问题。 895816513 发表于 2022-10-13 16:46
这个是你裁剪配置项造成的。
现在我的工作是需要裁剪内核，因为存在未开源的镜像在内核里面，会导致我的裁剪工作无法实施，也就造成我这边没法使用贵司的单板进行二次开发，请帮忙解决一下，谢谢! 这2份驱动不开源 那你的应用场景中，需要用到这个设备吗？ 不用的话，可以把这个驱动关掉。 penguin 发表于 2022-10-17 16:01
那你的应用场景中，需要用到这个设备吗？ 不用的话，可以把这个驱动关掉。
首先第一点，linux内核是gpl开源协议，如果使用linux开发的内核模块，按照开源协议是必须开源的。其次，需要你们说明spi-wk2xxx和mmc_blk_data这2个没有开源的模块主要的功能，才能确定我们是否会不会用。另外怎么关掉也需要做出说明，关掉后会有什么影响，目前看mmc_blk_data直接关掉好像是编译不过的。 spi-wk2xxx 是232和485的接口，是目前这个板子上没有的，可以直接去掉。 mmc_blk_data这个不能关掉。 penguin 发表于 2022-10-18 09:24
spi-wk2xxx 是232和485的接口，是目前这个板子上没有的，可以直接去掉。 mmc_blk_data这个不能关掉。
mmc_blk_data这个不能关掉，就解决不了这个帖子提出来的问题哦
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