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cfg80211: warn if db.txt is empty with CONFIG_CFG80211_INTERNAL_REGDB
It has happened twice now where elaborate troubleshooting has undergone on systems where CONFIG_CFG80211_INTERNAL_REGDB  has been set but yet net/wireless/db.txt was not updated. Despite the documentation on this it seems system integrators could use some more help with this, so throw out a kernel warning at boot time when their database is empty. This does mean that the error-prone system integrator won't likely realize the issue until they boot the machine but -- it does not seem to make sense to enable a build bug breaking random build testing.  http://wireless.kernel.org/en/developers/Regulatory/CRDA#CONFIG_CFG80211_INTERNAL_REGDB Cc: Stephen Rothwell <email@example.com> Cc: Youngsin Lee <firstname.lastname@example.org> Cc: Raja Mani <email@example.com> Cc: Senthil Kumar Balasubramanian <firstname.lastname@example.org> Cc: Vipin Mehta <email@example.com> Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Signed-off-by: Luis R. Rodriguez <email@example.com> Signed-off-by: John W. Linville <firstname.lastname@example.org>
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