linux-kernel - [off-list] a path toward killing thread

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Message-ID: <CALCETrW1BX4oB8QEPzzjm-MP0dQz5+AOJ9WWAkhXOTcxa8d4+A@mail.gmail.com>
Date:	Fri, 17 Jun 2016 15:41:49 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Kees Cook <keescook@...omium.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: [off-list] a path toward killing thread_info

https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=50d6cef284e80678c2065813b54bf525d1202d0f

It's fairly straightforward, it's arguably a cleanup, and, with it
applied, there are very few references to 'thread_info' left in the
core kernel at all.

PeterZ, I'm thinking of adding task_ti_flags_ptr to directly find the
ti flags word given a task_struct * so the scheduler can use it.  Does
that seem reasonable to you?

Ingo, lockdep tracks mutex owners by thread_info *.  Is there any good
reason for this?  Can I just use task_struct *?  If we do that, I
think thread_info will be *gone* from the core.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC