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authorAndy Lutomirski <luto@kernel.org>2016-03-09 19:00:34 -0800
committerIngo Molnar <mingo@kernel.org>2016-03-10 09:48:14 +0100
commit392a62549fbb80da48811d04391615a25c39d091 (patch)
treee2667beeba091a8a7321e7204ded439c1670dac3 /arch/x86/entry
parent2a41aa4feb25af3ead60b740c43df80c576efea2 (diff)
x86/entry: Remove TIF_SINGLESTEP entry work
Now that SYSENTER with TF set puts X86_EFLAGS_TF directly into regs->flags, we don't need a TIF_SINGLESTEP fixup in the syscall entry code. Remove it. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/2d15f24da52dafc9d2f0b8d76f55544f4779c517.1457578375.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/entry')
-rw-r--r--arch/x86/entry/common.c10
1 files changed, 0 insertions, 10 deletions
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 1a000f59f04a..209ba334e90f 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -172,16 +172,6 @@ long syscall_trace_enter_phase2(struct pt_regs *regs, u32 arch,
if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
BUG_ON(regs != task_pt_regs(current));
- /*
- * If we stepped into a sysenter/syscall insn, it trapped in
- * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
- * If user-mode had set TF itself, then it's still clear from
- * do_debug() and we need to set it again to restore the user
- * state. If we entered on the slow path, TF was already set.
- */
- if (work & _TIF_SINGLESTEP)
- regs->flags |= X86_EFLAGS_TF;
-
#ifdef CONFIG_SECCOMP
/*
* Call seccomp_phase2 before running the other hooks so that