Commit 951bc82c authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Make smp_processor_id() functional before start_kernel() 



Uses of smp_processor_id() get pushed earlier and earlier in
the start_kernel() sequence.  So just get it working before
we call start_kernel() to avoid all possible problems.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e6ed89ac

arch/sparc64/kernel/head.S

+30 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/config.h>

#include <linux/version.h>

#include <linux/errno.h>

#include <linux/threads.h>

#include <asm/thread_info.h>

#include <asm/asi.h>

#include <asm/pstate.h>
@@ -493,6 +494,35 @@ tlb_fixup_done: 
	call	prom_init

	 mov	%l7, %o0			! OpenPROM cif handler



	/* Initialize current_thread_info()->cpu as early as possible.

	 * In order to do that accurately we have to patch up the get_cpuid()

	 * assembler sequences.  And that, in turn, requires that we know

	 * if we are on a Starfire box or not.  While we're here, patch up

	 * the sun4v sequences as well.

	 */

	call	check_if_starfire

	 nop

	call	per_cpu_patch

	 nop

	call	sun4v_patch

	 nop



#ifdef CONFIG_SMP

	call	hard_smp_processor_id

	 nop

	cmp	%o0, NR_CPUS

	blu,pt	%xcc, 1f

	 nop

	call	boot_cpu_id_too_large

	 nop

	/* Not reached... */



1:

#else

	mov	0, %o0

#endif

	stb	%o0, [%g6 + TI_CPU]



	/* Off we go.... */

	call	start_kernel

	 nop

arch/sparc64/kernel/setup.c

+11 −12
Original line number Diff line number Diff line
@@ -220,7 +220,7 @@ char reboot_command[COMMAND_LINE_SIZE]; 


static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };



static void __init per_cpu_patch(void)

void __init per_cpu_patch(void)

{

	struct cpuid_patch_entry *p;

	unsigned long ver;
@@ -280,7 +280,7 @@ static void __init per_cpu_patch(void) 
	}

}



static void __init sun4v_patch(void)

void __init sun4v_patch(void)

{

	struct sun4v_1insn_patch_entry *p1;

	struct sun4v_2insn_patch_entry *p2;
@@ -315,6 +315,15 @@ static void __init sun4v_patch(void) 
	}

}



#ifdef CONFIG_SMP

void __init boot_cpu_id_too_large(int cpu)

{

	prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",

		    cpu, NR_CPUS);

	prom_halt();

}

#endif



void __init setup_arch(char **cmdline_p)

{

	/* Initialize PROM console and command line. */
@@ -332,16 +341,6 @@ void __init setup_arch(char **cmdline_p) 
	conswitchp = &prom_con;

#endif



	/* Work out if we are starfire early on */

	check_if_starfire();



	/* Now we know enough to patch the get_cpuid sequences

	 * used by trap code.

	 */

	per_cpu_patch();



	sun4v_patch();



	boot_flags_init(*cmdline_p);



	idprom_init();

arch/sparc64/kernel/smp.c

+3 −13
Original line number Diff line number Diff line
@@ -1264,7 +1264,6 @@ void __init smp_tick_init(void) 
	boot_cpu_id = hard_smp_processor_id();

	current_tick_offset = timer_tick_offset;



	cpu_set(boot_cpu_id, cpu_online_map);

	prof_counter(boot_cpu_id) = prof_multiplier(boot_cpu_id) = 1;

}
@@ -1345,18 +1344,6 @@ void __init smp_setup_cpu_possible_map(void) 


void __devinit smp_prepare_boot_cpu(void)

{

	int cpu = hard_smp_processor_id();



	if (cpu >= NR_CPUS) {

		prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");

		prom_halt();

	}



	current_thread_info()->cpu = cpu;

	__local_per_cpu_offset = __per_cpu_offset(cpu);



	cpu_set(smp_processor_id(), cpu_online_map);

	cpu_set(smp_processor_id(), phys_cpu_present_map);

}



int __devinit __cpu_up(unsigned int cpu)
@@ -1433,4 +1420,7 @@ void __init setup_per_cpu_areas(void) 


	for (i = 0; i < NR_CPUS; i++, ptr += size)

		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);



	/* Setup %g5 for the boot cpu.  */

	__local_per_cpu_offset = __per_cpu_offset(smp_processor_id());

}