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Revision 140d0b2108faebc77c6523296e211e509cb9f5f9 authored by Linus Torvalds on 05 August 2011, 05:35:59 UTC, committed by Linus Torvalds on 05 August 2011, 05:35:59 UTC 
Do 'shm_init_ns()' in an early pure_initcall
 
This isn't really critical any more, since other patches (commit
298507d4d2cf: "shm: optimize exit_shm()") have caused us to not actually
need to touch the rw_mutex unless there are actual shm segments
associated with the namespace, but we really should do tne shm_init_ns()
earlier than we do now.

This, together with commit 288d5abec831 ("Boot up with usermodehelper
disabled") will mean that we really do initialize the initial ipc
namespace data structure before we run any tasks.

Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 24f0eed
Raw File
pc873xx.c 
#include <linux/ioport.h>
#include <asm/io.h>

#include "pc873xx.h"

static unsigned pc873xx_probelist[] = {0x398, 0x26e, 0};

static char *pc873xx_names[] = {
	"PC87303", "PC87306", "PC87312", "PC87332", "PC87334"
};

static unsigned int base, model;


unsigned int __init pc873xx_get_base()
{
	return base;
}

char *__init pc873xx_get_model()
{
	return pc873xx_names[model];
}

static unsigned char __init pc873xx_read(unsigned int base, int reg)
{
	outb(reg, base);
	return inb(base + 1);
}

static void __init pc873xx_write(unsigned int base, int reg, unsigned char data)
{
	unsigned long flags;

	local_irq_save(flags);
	outb(reg, base);
	outb(data, base + 1);
	outb(data, base + 1);		/* Must be written twice */
	local_irq_restore(flags);
}

int __init pc873xx_probe(void)
{
	int val, index = 0;

	while ((base = pc873xx_probelist[index++])) {

		if (request_region(base, 2, "Super IO PC873xx") == NULL)
			continue;

		val = pc873xx_read(base, REG_SID);
		if ((val & 0xf0) == 0x10) {
			model = PC87332;
			break;
		} else if ((val & 0xf8) == 0x70) {
			model = PC87306;
			break;
		} else if ((val & 0xf8) == 0x50) {
			model = PC87334;
			break;
		} else if ((val & 0xf8) == 0x40) {
			model = PC87303;
			break;
		}

		release_region(base, 2);
	}

	return (base == 0) ? -1 : 1;
}

void __init pc873xx_enable_epp19(void)
{
	unsigned char data;

	printk(KERN_INFO "PC873xx enabling EPP v1.9\n");
	data = pc873xx_read(base, REG_PCR);
	pc873xx_write(base, REG_PCR, (data & 0xFC) | 0x02);
}

void __init pc873xx_enable_ide(void)
{
	unsigned char data;

	printk(KERN_INFO "PC873xx enabling IDE interrupt\n");
	data = pc873xx_read(base, REG_FER);
	pc873xx_write(base, REG_FER, data | 0x40);
}
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