Messages in this thread | | | From | Gabriel Krisman Bertazi <> | Subject | [PATCH 0/6] Reclaim x86 psABI TIF flags | Date | Tue, 28 Jul 2020 16:22:23 -0400 |
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Hi,
This patch set reduces the number of arch-specific TIF_ flags in x86, as a clean up to reduce the pressure over the few remaining x86_32 TIF bits and as a preparation to have the arch-agnostic TIF_ flags shared by different architectures by the common syscall entry code recently published by Thomas Gleixner.
This is based on top of:
git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/entry
It was tested by booting and running an i386 rootfs over the 64bit kernel, and also by running x32 binaries on top of it.
There is one remaining use of TIF_IA32 in User Mode Linux which is turned off by a bogus define, such that I think it is currently dead code and apparently a bug. I think, it was wired to an old TIF_IA32 flag definition that doesn't exist anymore in arch/um. I think it deserves a fix other than dropping that code, but it is a different piece of work that I will tackle next.
Gabriel Krisman Bertazi (6): arch: x86: Don't use TIF flags for mm context arch: x86: Wrap TIF_IA32 checks arch: x86: Wrap TIF_X32 checks arch: x86: Expose psABI on thread_info arch: x86: Reclaim TIF_IA32 flag arch: x86: Reclaim TIF_X32 flag
arch/x86/entry/vdso/vma.c | 2 +- arch/x86/events/core.c | 4 ++-- arch/x86/events/intel/ds.c | 2 +- arch/x86/events/intel/lbr.c | 2 +- arch/x86/include/asm/compat.h | 2 +- arch/x86/include/asm/elf.h | 2 +- arch/x86/include/asm/mmu_context.h | 2 +- arch/x86/include/asm/thread_info.h | 15 +++++++++++---- arch/x86/kernel/perf_regs.c | 2 +- arch/x86/kernel/process_64.c | 16 ++++++---------- arch/x86/oprofile/backtrace.c | 2 +- 11 files changed, 27 insertions(+), 24 deletions(-)
-- 2.27.0
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