Commit 7aa62645 authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Do not try to write to %tick or %stick on SUN4V. 



Writes by privileged code are disallowed.  The hypervisor manages
the non-privileged bit.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b5a37e96

arch/sparc64/kernel/time.c

+16 −10
Original line number Diff line number Diff line
@@ -193,6 +193,11 @@ struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations; 


static void stick_init_tick(unsigned long offset)

{

	/* Writes to the %tick and %stick register are not

	 * allowed on sun4v.  The Hypervisor controls that

	 * bit, per-strand.

	 */

	if (tlb_type != hypervisor) {

		tick_disable_protection();



		/* Let the user get at STICK too. */
@@ -203,6 +208,7 @@ static void stick_init_tick(unsigned long offset) 
		: /* no outputs */

		: "r" (TICK_PRIV_BIT)

		: "g1", "g2");

	}



	__asm__ __volatile__(

	"	rd	%%asr24, %%g1\n"