These changes make SYSENTER64 code path save flags and user's stack pointer in pt_regs->flags and pt_regs->sp, where they belong.
As a result, we can drop stub_iopl() and thread_struct::usersp. Usage of PER_CPU(old_rsp) is reduced to bare minimum. FIXUP/RESTORE_TOP_OF_STACK macros are on diet too. (This is a resend. Previous version was on top of KERNEL_STACK_OFFSET removal patch. This one is on top of Andy's current git. Patch is run-tested.) CC: Linus Torvalds <[email protected]> CC: Steven Rostedt <[email protected]> CC: Ingo Molnar <[email protected]> CC: Borislav Petkov <[email protected]> CC: "H. Peter Anvin" <[email protected]> CC: Andy Lutomirski <[email protected]> CC: Oleg Nesterov <[email protected]> CC: Frederic Weisbecker <[email protected]> CC: Alexei Starovoitov <[email protected]> CC: Will Drewry <[email protected]> CC: Kees Cook <[email protected]> CC: [email protected] CC: [email protected] Denys Vlasenko (2): x86: save r11 into pt_regs->flags on SYSCALL64 fastpath x86: save user %rsp in pt_regs->sp on SYSCALL64 fastpath arch/x86/include/asm/calling.h | 20 +++++++++----- arch/x86/include/asm/compat.h | 2 +- arch/x86/include/asm/processor.h | 6 ----- arch/x86/include/asm/ptrace.h | 8 ++---- arch/x86/kernel/entry_64.S | 57 ++++++++++++++-------------------------- arch/x86/kernel/perf_regs.c | 2 +- arch/x86/kernel/process_64.c | 8 +----- arch/x86/syscalls/syscall_64.tbl | 2 +- arch/x86/um/sys_call_table_64.c | 2 +- 9 files changed, 40 insertions(+), 67 deletions(-) -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
