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Re: [RFC 2/4] x86/thread_info: kill TIF_ADDR32 in favour of ADDR_LIMIT_32BIT

Started byAndy Lutomirski <luto@amacapital.net>
First post2016-12-31 02:40 +0100
Last post2016-12-31 02:40 +0100
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  Re: [RFC 2/4] x86/thread_info: kill TIF_ADDR32 in favour of ADDR_LIMIT_32BIT Andy Lutomirski <luto@amacapital.net> - 2016-12-31 02:40 +0100

#1548781 — Re: [RFC 2/4] x86/thread_info: kill TIF_ADDR32 in favour of ADDR_LIMIT_32BIT

FromAndy Lutomirski <luto@amacapital.net>
Date2016-12-31 02:40 +0100
SubjectRe: [RFC 2/4] x86/thread_info: kill TIF_ADDR32 in favour of ADDR_LIMIT_32BIT
Message-ID<sUgOl-4AL-1@gated-at.bofh.it>
On Fri, Dec 30, 2016 at 7:56 AM, Dmitry Safonov <dsafonov@virtuozzo.com> wrote:
> This thread flag is completely x86-specific, consolidate it with
> ADDR_LIMIT_32BIT personality which is defined but not used on x86.
> It will free one of thread flags and consolidate personality with
> other arches.
> After this commit ADDR_LIMIT_32BIT is set by the kernel automatically
> in COMPAT_SET_PERSONALITY() for 32-bit ELF files and for 32-bit a.out.
> It's cleared in SET_PERSONALITY() for 64-bit ELFs.

I'm okay with this as a plain cleanup, but I'm not convinced that this
is really the right long-term solution.  See next email.

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