Re: [PATCH 2/2] x86/math-emu: Remove define layer for undocumented opcodes

From: Ingo Molnar
Date: Fri Sep 18 2015 - 03:36:24 EST



* Denys Vlasenko <dvlasenk@xxxxxxxxxx> wrote:

> No code changes.
>
> Signed-off-by: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
> CC: Ingo Molnar <mingo@xxxxxxxxxx>
> CC: Borislav Petkov <bp@xxxxxxxxx>
> CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
> CC: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> CC: Kees Cook <keescook@xxxxxxxxxxxx>
> CC: x86@xxxxxxxxxx
> CC: linux-kernel@xxxxxxxxxxxxxxx
> ---
> arch/x86/math-emu/fpu_entry.c | 29 +++++++++--------------------
> 1 file changed, 9 insertions(+), 20 deletions(-)

This patch should come before riskier patches introducing new instructions, to
make eventual reverts and fixes easier.

The rule is generally: sort patches by risk, low risk first, high risk later. This
means that cleanups, restructuring, refactoring patches always come first - beyond
making bisection and reverts easier, those make subsequent patches cleaner as well
and make any bugs in subsequent patches easier to see as well.

Thanks,

Ingo
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