Messages in this thread | | | From | Andy Lutomirski <> | Subject | [RFC 0/3] Baby steps toward cleaning up KERNEL_STACK_OFFSET | Date | Thu, 26 Feb 2015 15:52:08 -0800 |
| |
Denys is right that KERNEL_STACK_OFFSET is a mess. Let's start fixing it.
This removes all C code that *reads* kernel_stack. It also fixes the KERNEL_STACK_OFFSET abomination in ia32_sysenter_target.
It does not fix the KERNEL_STACK_OFFSET abomination in GET_THREAD_INFO and THREAD_INFO. I think that should be its own patch.
It also doesn't change the two syscall targets. To fix them, we should make a decision. Either we should make KERNEL_STACK_OFFSET have the correct nonzero value to save an instruction or we should get rid of kernel_stack entirely.
Andy Lutomirski (3): x86: Add this_cpu_sp0() to read sp0 for the current cpu x86: Switch all C consumers of kernel_stack to this_cpu_sp0 x86, asm: Change the 32-bit sysenter code to use sp0
arch/x86/ia32/ia32entry.S | 3 +-- arch/x86/include/asm/processor.h | 5 +++++ arch/x86/include/asm/thread_info.h | 3 +-- arch/x86/kernel/asm-offsets_64.c | 1 + arch/x86/kernel/traps.c | 2 +- arch/x86/lguest/boot.c | 1 + arch/x86/xen/enlighten.c | 1 + 7 files changed, 11 insertions(+), 5 deletions(-)
-- 2.1.0
| |