On 24/01/18 11:27, Michael Fothergill wrote: > > > > > > Hi there, I am running kernel 4.14.14 under gentoo testing on an > AMD kaveri box. > > The version of GCC I am using is 7.2. Whether that means the > reptoline patch is working for me I am not quite sure but it could > be I guess..... > > Someone who is smarter than the average bear has written a patch for > the spectre problem with no performance penalty: > > > https://www.neowin.net/news/retpoline-patch-coming-to-linux-49-and-linux-414 > > <https://www.neowin.net/news/retpoline-patch-coming-to-linux-49-and-linux-414> > > I am not sure if you can do this as debian testing or experimental. > > Cheers > > Michael Fothergill > > > You can compile the kernel in debian: > > https://www.debian.org/releases/jessie/i386/ch08s06.html.en > > > There is also a debian page on gcc7 > > https://wiki.debian.org/GCC7 > > If I ask the gentoo folks they will tell me if the KPTI and retpoline > patches are turned on automatically in kernel 4.14.14 > or if you have to set a specific flag when you run make menuconfig (runs > in Debian too); then if GCC7 is new enough for this > you are good to go......
The neowin link above has a link to a Phoronix article[1], which suggests you need GCC 8.0, or maybe 7.3 if a backport succeeds. That was 9 days ago, of course ... Stretch only has 6.3, and even sid only has 7.2, so I don't see it hitting debian soon. Richard [1] https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.9-4.14-Retpoline
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