TI_IA32 and TIF_X32 are not strictly necessary and they are only set at task creation time, which doesn't fit with processes that transition between 64/32 bits. In addition, other reasons to drop these flags are that we are running out of TI flags for x86 and it is generally a good idea to reduce architecture specific TI flags, before move the generic ones to common code.
Many of the ideas for this patchset came from Andy Lutomirski (Thank you!) The only difference of v2 from v1 is the addition of the final 3 patches that solve the last 3 cases of TIF_IA32 and TIF_X32 usage, and actually remove the TI flags. Finally, the testing for this patchset was done exercising the code paths of each case where the flags were used with x32, ia32 and x64 applications. Finally, x86 selftests showed no regressions. Gabriel Krisman Bertazi (9): 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 x86: Use current USER_CS to setup correct context on vmx entry x86: Convert mmu context ia32_compat into a proper flags field x86: Reclaim TIF_IA32 and TIF_X32 arch/x86/entry/vdso/vma.c | 21 ++++++++++------- arch/x86/entry/vsyscall/vsyscall_64.c | 2 +- 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/include/asm/mmu.h | 6 +++-- arch/x86/include/asm/mmu_context.h | 2 +- arch/x86/include/asm/thread_info.h | 4 ---- arch/x86/kernel/perf_regs.c | 2 +- arch/x86/kernel/process_64.c | 34 ++++++++++++++------------- arch/x86/kvm/vmx/vmx.c | 2 +- arch/x86/oprofile/backtrace.c | 2 +- 14 files changed, 67 insertions(+), 53 deletions(-) -- 2.28.0
