I want to research why a Linux kernel feature appears to be missing from my Linux install by searching the Linux kernel mailing list for recent discussions on the subject. The only site that I've found that offers a search of the mailing list archives is gmane. However, searching for terms with quotes (e.g., "/usr/firmware") on gmane does not restrict results to include only the quoted phrase. Is there a more advanced search of the Linux kernel mailing list available?
You can use lkml.org to search through the archive. It's unofficial!
There are others as well:
Tips for searching
If you drill in enough to the lkml.org site you'll find a search box, like here for example:
Additionally I would suggest leveraging the power of Google to help with this. Most of these types of sites suck in comparison as to what you can search with using Google.
Put this in your search bar if you want to find everything on lkml.org related to NFS!
In addition to the places mentioned by slm, there's:
Both of which are general services that include the linux kernel list. The GMANE one has the most going for it -- click "Searching" in the side bar for an explanation of the features.
I'd love to say I knew an easy way to just download the entire archive so you could search it yourself, but I don't. You could, however, put it together with a long series of automated requests (e.g. via curl) and some html scraping.