(A). I have instructions to add these to /usr/src/linux/sound/pci/hda/hda_codec.c-

EXPORT_SYMBOL(snd_hda_codec_read); 
EXPORT_SYMBOL(snd_hda_codec_write);

(B). However, the file already contains something similar like this-

EXPORT_SYMBOL_HDA(snd_hda_codec_read); 

EXPORT_SYMBOL_HDA(snd_hda_codec_write);

The make command ends in errors that could be a conflict between the two sets of read/write commands-

 CC [M]  sound/pci/hda/hda_codec.o
sound/pci/hda/hda_codec.c:191: error: redefinition of ‘__kstrtab_snd_hda_codec_read’
sound/pci/hda/hda_codec.c:34: note: previous definition of ‘__kstrtab_snd_hda_codec_read’ was here
sound/pci/hda/hda_codec.c:191: error: redefinition of ‘__ksymtab_snd_hda_codec_read’
sound/pci/hda/hda_codec.c:34: note: previous definition of ‘__ksymtab_snd_hda_codec_read’ was here
sound/pci/hda/hda_codec.c:220: error: redefinition of ‘__kstrtab_snd_hda_codec_write’
sound/pci/hda/hda_codec.c:35: note: previous definition of ‘__kstrtab_snd_hda_codec_write’ was here
sound/pci/hda/hda_codec.c:220: error: redefinition of ‘__ksymtab_snd_hda_codec_write’
sound/pci/hda/hda_codec.c:35: note: previous definition of ‘__ksymtab_snd_hda_codec_write’ was here
make[3]: *** [sound/pci/hda/hda_codec.o] Error 1
make[2]: *** [sound/pci/hda] Error 2
make[1]: *** [sound/pci] Error 2
make: *** [sound] Error 2

Are (A) and (B) mutually exclusive?

Does (B) already do what (A) is supposed to do?

Thank you.