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>
pushq %r13
pushq %r14
pushq %r15
- pushfq
/* switch stack */
movq %rsp, TASK_threadsp(%rdi)
#endif
/* restore callee-saved registers */
- popfq
popq %r15
popq %r14
popq %r13
* order of the fields must match the code in __switch_to_asm().
*/
struct inactive_task_frame {
- unsigned long flags;
#ifdef CONFIG_X86_64
unsigned long r15;
unsigned long r14;
unsigned long r13;
unsigned long r12;
#else
+ unsigned long flags;
unsigned long si;
unsigned long di;
#endif
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;