Commit bd4352ca authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Fix bootup with mcount in some configs. 



Functions invoked early when booting up a cpu can't use
tracing because mcount requires a valid 'current_thread_info()'
and TLB mappings to be setup.

The code path of sun4v_register_mondo_queues --> register_one_mondo
is one such case.  sun4v_register_mondo_queues already has the
necessary 'notrace' annotation, but register_one_mondo does not.

Normally register_one_mondo is inlined so the bug doesn't trigger,
but with some config/compiler combinations, it won't be so we
must properly mark it notrace.

While we're here, add 'notrace' annoations to prom_printf and
prom_halt so that early error handling won't have the same problem.

Reported-by: default avatarAlexander Beregalov <a.beregalov@gmail.com>
Reported-by: default avatarLeif Sawyer <lsawyer@gci.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e6617c6e

arch/sparc/kernel/irq_64.c

+1 −1
Original line number Diff line number Diff line
@@ -886,7 +886,7 @@ void notrace init_irqwork_curcpu(void) 
 * Therefore you cannot make any OBP calls, not even prom_printf,

 * from these two routines.

 */

static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)

static void __cpuinit notrace register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask)

{

	unsigned long num_entries = (qmask + 1) / 64;

	unsigned long status;

arch/sparc/prom/misc_64.c

+1 −1
Original line number Diff line number Diff line
@@ -88,7 +88,7 @@ void prom_cmdline(void) 
/* Drop into the prom, but completely terminate the program.

 * No chance of continuing.

 */

void prom_halt(void)

void notrace prom_halt(void)

{

#ifdef CONFIG_SUN_LDOMS

	if (ldom_domaining_enabled)

arch/sparc/prom/printf.c

+3 −4
Original line number Diff line number Diff line
@@ -14,14 +14,14 @@ 
 */



#include <linux/kernel.h>

#include <linux/compiler.h>



#include <asm/openprom.h>

#include <asm/oplib.h>



static char ppbuf[1024];



void

prom_write(const char *buf, unsigned int n)

void notrace prom_write(const char *buf, unsigned int n)

{

	char ch;
@@ -33,8 +33,7 @@ prom_write(const char *buf, unsigned int n) 
	}

}



void

prom_printf(const char *fmt, ...)

void notrace prom_printf(const char *fmt, ...)

{

	va_list args;

	int i;

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