Messages in this thread | | | Date | Wed, 30 Dec 2015 15:32:30 -0800 | Subject | Re: [PATCHV5 3/3] x86, ras: Add __mcsafe_copy() function to recover from machine checks | From | Tony Luck <> |
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On Sun, Dec 27, 2015 at 4:18 AM, Andy Lutomirski <luto@amacapital.net> wrote: > I think I can save you some pondering. This old patch gives two flag > bits. Feel free to borrow the patch, but you'll probably want to > change the _EXTABLE_CLASS_XYZ macros: > > https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=strict_uaccess_fixups/patch_v1&id=16644d9460fc6531456cf510d5efc57f89e5cd34
Thanks!
I took that, and some of Boris's changes, and stirred it altogether at:
git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git mcsafev6
First commit is just your patch from above (patch wouldn't apply it directly because of other nearby changes, but I think I didn't break it)
Second commit pulls the core of fixup_exception() into separate functions for each class
Third adds a new class that provides the fault number to the fixup code in regs->ax.
Fourth is just a jumble of the rest .. needs to be split into two parts (one for machine check handler, second to add __mcsafe_copy())
Fifth is just a hack because I clearly didn't understand what I was doing in parts 2&3 because my new class shows up as '3' not '1'!
Andy: Can you explain the assembler/linker arithmetic for the class?
-Tony
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