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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Andrew Morton
394e3902c5
When we stop allocating percpu memory for not-possible CPUs we must not touch the percpu data for not-possible CPUs at all. The correct way of doing this is to test cpu_possible() or to use for_each_cpu(). This patch is a kernel-wide sweep of all instances of NR_CPUS. I found very few instances of this bug, if any. But the patch converts lots of open-coded test to use the preferred helper macros. Cc: Mikael Starvik <[email protected]> Cc: David Howells <[email protected]> Acked-by: Kyle McMartin <[email protected]> Cc: Anton Blanchard <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Paul Mundt <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: William Lee Irwin III <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Christian Zankel <[email protected]> Cc: Philippe Elie <[email protected]> Cc: Nathan Scott <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Eric Dumazet <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
49 lines
835 B
C
49 lines
835 B
C
#ifndef _ASM_ALPHA_TOPOLOGY_H
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#define _ASM_ALPHA_TOPOLOGY_H
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <asm/machvec.h>
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#ifdef CONFIG_NUMA
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static inline int cpu_to_node(int cpu)
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{
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int node;
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if (!alpha_mv.cpuid_to_nid)
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return 0;
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node = alpha_mv.cpuid_to_nid(cpu);
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#ifdef DEBUG_NUMA
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BUG_ON(node < 0);
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#endif
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return node;
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}
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static inline cpumask_t node_to_cpumask(int node)
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{
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cpumask_t node_cpu_mask = CPU_MASK_NONE;
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int cpu;
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for_each_online_cpu(cpu) {
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if (cpu_to_node(cpu) == node)
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cpu_set(cpu, node_cpu_mask);
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}
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#ifdef DEBUG_NUMA
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printk("node %d: cpu_mask: %016lx\n", node, node_cpu_mask);
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#endif
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return node_cpu_mask;
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}
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#define pcibus_to_cpumask(bus) (cpu_online_map)
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#else /* CONFIG_NUMA */
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# include <asm-generic/topology.h>
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#endif /* !CONFIG_NUMA */
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#endif /* _ASM_ALPHA_TOPOLOGY_H */
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