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. Changes since v1: on Ingo's request, split into 4 patches intead of 2. CC: Linus Torvalds <torva...@linux-foundation.org> CC: Steven Rostedt <rost...@goodmis.org> CC: Ingo Molnar <mi...@kernel.org> CC: Borislav Petkov <b...@alien8.de> CC: "H. Peter Anvin" <h...@zytor.com> CC: Andy Lutomirski <l...@amacapital.net> CC: Oleg Nesterov <o...@redhat.com> CC: Frederic Weisbecker <fweis...@gmail.com> CC: Alexei Starovoitov <a...@plumgrid.com> CC: Will Drewry <w...@chromium.org> CC: Kees Cook <keesc...@chromium.org> CC: x...@kernel.org CC: linux-kernel@vger.kernel.org Denys Vlasenko (4): x86: save r11 into pt_regs->flags on SYSCALL64 fastpath Remove stub_iopl x86: save user %rsp in pt_regs->sp on SYSCALL64 fastpath Remove unused stuff 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
