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sched/x86_64: Don't save flags on context switch

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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>
This commit is contained in:
Peter Zijlstra
2019-03-19 11:35:46 +01:00
committed by Ingo Molnar
parent 2f0f9e9ad7
commit 64604d54d3
3 changed files with 1 additions and 10 deletions
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7
arch/x86/kernel/process_64.c
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@@ -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;