Messages in this thread | | | Date | Sun, 27 Dec 2015 11:04:24 -0800 | Subject | Re: [PATCHV5 3/3] x86, ras: Add __mcsafe_copy() function to recover from machine checks | From | Dan Williams <> |
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On Sun, Dec 27, 2015 at 5:33 AM, Borislav Petkov <bp@alien8.de> wrote: > On Sun, Dec 27, 2015 at 05:25:45AM -0800, Andy Lutomirski wrote: >> That could significantly bloat the kernel image. > > Yeah, we probably should build an allyesconfig and see how big > __ex_table is and compute how much actually that bloat would be, > because... > >> Anyway, the bit 31 game isn't so bad IMO because it's localized to the >> extable macros and the extable reader, whereas the bit 63 thing is all >> tangled up with the __mcsafe_copy thing, and that's just the first >> user of a more general mechanism. >> >> Did you see this: >> >> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=strict_uaccess_fixups/patch_v1&id=16644d9460fc6531456cf510d5efc57f89e5cd34 > > ... the problem this has is that you have 4 classes, AFAICT. And since > we're talking about a generic mechanism, the moment the 4 classes are > not enough, this new scheme fails. > > I'm just saying... > > 4 classes are probably more than enough but we don't know.
Then we add support for more than 4 when/if the time comes...
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