This series cleans up copy_thread and hopefully makes the code easier to understand. The big changes in patch 3 and 4 which use the switch stack instead of user int stack for restoring fn and args parameters for the new thread.
I don't think there's any bugs fixed here because in the case of a kernel-user thread, kthread_exec would re-populate the user int frame with regs, so that should be okay. Since v1, I only rejiged some changes between patches and minor cosmetic improvements but no functional change. Tested with 32e/s 64e/s BE and LE. Thanks, Nick Nicholas Piggin (8): powerpc: copy_thread remove unused pkey code powerpc: copy_thread make ret_from_fork register setup consistent powerpc: use switch frame for ret_from_kernel_thread parameters powerpc/64: ret_from_fork avoid restoring regs twice powerpc: copy_thread differentiate kthreads and user mode threads powerpc: differentiate kthread from user kernel thread start powerpc: copy_thread don't set _TIF_RESTOREALL powerpc: copy_thread don't set PPR in user interrupt frame regs arch/powerpc/include/asm/thread_info.h | 2 + arch/powerpc/kernel/entry_32.S | 23 ++++- arch/powerpc/kernel/interrupt_64.S | 28 +++++- arch/powerpc/kernel/process.c | 124 ++++++++++++++----------- 4 files changed, 113 insertions(+), 64 deletions(-) -- 2.37.2
