linux-kernel - [PATCH 0/6] Prepare for removal of TIF_IA32 and TIF

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Message-Id: <20200912070553.330622-1-krisman@collabora.com>
Date:   Sat, 12 Sep 2020 03:05:47 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     luto@...nel.org, tglx@...utronix.de
Cc:     hpa@...or.com, bp@...en8.de, rric@...nel.org, peterz@...radead.org,
        mingo@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH 0/6] Prepare for removal of TIF_IA32 and TIF_X32

We are running out of TI flags for x86.  This patchset removes several
usages of TIF_IA32 and TIF_x32 in preparation to reclaim these flags.
After these cleanups, there is still one more user for both of them,
which I need to take a better look before removing.

Many of the ideas for this patchset came from Andy Lutomirski (Thank
you!)

These were tested by exercising these paths with x32 and ia32 binaries.

Gabriel Krisman Bertazi (6):
  x86: events: Avoid TIF_IA32 when checking 64bit mode
  x86: Simplify compat syscall userspace allocation
  x86: oprofile: Avoid TIF_IA32 when checking 64bit mode
  x86: elf: Use e_machine to choose DLINFO in compat
  x86: elf: Use e_machine to select start_thread for x32
  x86: elf: Use e_machine to select setup_additional_pages for x32

 arch/x86/entry/vdso/vma.c     | 21 ++++++++++++---------
 arch/x86/events/core.c        |  2 +-
 arch/x86/events/intel/ds.c    |  2 +-
 arch/x86/events/intel/lbr.c   |  2 +-
 arch/x86/include/asm/compat.h | 15 +++++++--------
 arch/x86/include/asm/elf.h    | 24 ++++++++++++++++++------
 arch/x86/kernel/perf_regs.c   |  2 +-
 arch/x86/kernel/process_64.c  | 11 +++++++----
 arch/x86/oprofile/backtrace.c |  2 +-
 9 files changed, 49 insertions(+), 32 deletions(-)

-- 
2.28.0