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v0.8.1
https://github.com/torvalds/linux
02 December 2023, 22:23:51 UTC
Revision 6ebba0e2f56ee77270a9ef8e92c1b4ec38e5f419 authored by Sergei Shtylyov on 27 May 2006, 16:43:04 UTC, committed by Ralf Baechle on 05 June 2006, 23:15:16 UTC 
[MIPS] Fix swap entry for MIPS32 36-bit physical address
 
    
With 64-bit physical address enabled, 'swapon' was causing kernel oops on
Alchemy CPUs (MIPS32) because of the swap entry type field corrupting the
_PAGE_FILE bit in 'pte_low' field. So, switch to storing the swap entry in
'pte_high' field using all its bits except _PAGE_GLOBAL and _PAGE_VALID which
gives 25 bits for the swap entry offset.
    
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 79e0bc3
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Tip revision: 6ebba0e2f56ee77270a9ef8e92c1b4ec38e5f419 authored by Sergei Shtylyov on 27 May 2006, 16:43:04 UTC
[MIPS] Fix swap entry for MIPS32 36-bit physical address
Tip revision: 6ebba0e
cpumask.c 
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/cpumask.h>
#include <linux/module.h>

int __first_cpu(const cpumask_t *srcp)
{
	return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
}
EXPORT_SYMBOL(__first_cpu);

int __next_cpu(int n, const cpumask_t *srcp)
{
	return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1));
}
EXPORT_SYMBOL(__next_cpu);

/*
 * Find the highest possible smp_processor_id()
 *
 * Note: if we're prepared to assume that cpu_possible_map never changes
 * (reasonable) then this function should cache its return value.
 */
int highest_possible_processor_id(void)
{
	unsigned int cpu;
	unsigned highest = 0;

	for_each_cpu_mask(cpu, cpu_possible_map)
		highest = cpu;
	return highest;
}
EXPORT_SYMBOL(highest_possible_processor_id);

int __any_online_cpu(const cpumask_t *mask)
{
	int cpu;

	for_each_cpu_mask(cpu, *mask) {
		if (cpu_online(cpu))
			break;
	}
	return cpu;
}
EXPORT_SYMBOL(__any_online_cpu);
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