On Fri, 17 Feb 2006, Chuck Ebbert wrote:
>
> When entering kernel via int80, TIF_SINGLESTEP is not set
> when TF has been set in eflags by the user. This patch
> does that.
This really shouldn't matter.
When we enter the kernel through "int 0x80", we don't need to do anything
about TIF_SINGLESTEP, because unlike the "sysenter" path, the "int"
instruction will automatically do the right thing (save old eflags on the
stack).
So afaik, this won't actually do anything (except make _the_ most
timing-critical path in the kernel slower). Have you actually seen any
effects of it?
Linus
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