diff options
| author |   Peter Zijlstra <peterz@infradead.org> | 2019-03-19 11:35:46 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-04-03 11:02:24 +0200 |
| commit | 64604d54d3115fee89598bfb6d8d2252f8a2d114 (patch) | |
| tree | 8f2dd9b37fb0011a9814d57150307872db6f294e /arch/x86/kernel/process_64.c | |
| parent | objtool: Add Direction Flag validation (diff) | |
| download | linux-dev-64604d54d3115fee89598bfb6d8d2252f8a2d114.tar.xz linux-dev-64604d54d3115fee89598bfb6d8d2252f8a2d114.zip | |
sched/x86_64: Don't save flags on context switch
Now that we have objtool validating AC=1 state for all x86_64 code,
we can once again guarantee clean flags on schedule.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 026a43be9bd1..844a28b29967 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -393,13 +393,6 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long sp, fork_frame = container_of(childregs, struct fork_frame, regs); frame = &fork_frame->frame; - /* - * For a new task use the RESET flags value since there is no before. - * All the status flags are zero; DF and all the system flags must also - * be 0, specifically IF must be 0 because we context switch to the new - * task with interrupts disabled. - */ - frame->flags = X86_EFLAGS_FIXED; frame->bp = 0; frame->ret_addr = (unsigned long) ret_from_fork; p->thread.sp = (unsigned long) fork_frame; |