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percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t

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__get_cpu_var can paper over differences in the definitions of
cpumask_var_t and either use the address of the cpumask variable
directly or perform a fetch of the address of the struct cpumask
allocated elsewhere. This is important particularly when using per cpu
cpumask_var_t declarations because in one case we have an offset into
a per cpu area to handle and in the other case we need to fetch a
pointer from the offset.

This patch introduces a new macro

this_cpu_cpumask_var_ptr()

that is defined where cpumask_var_t is defined and performs the proper
actions. All use cases where __get_cpu_var is used with cpumask_var_t
are converted to the use of this_cpu_cpumask_var_ptr().

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Christoph Lameter
2014-08-26 19:12:21 -05:00
committed by Tejun Heo
parent 23f66e2d66
commit 4ba2968420
7 changed files with 17 additions and 7 deletions
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3
arch/x86/kernel/apic/x2apic_cluster.c
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@@ -42,8 +42,7 @@ __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
* We are to modify mask, so we need an own copy
* and be sure it's manipulated with irq off.
*/
ipi_mask_ptr = __raw_get_cpu_var(ipi_mask);
cpumask_copy(ipi_mask_ptr, mask);
ipi_mask_ptr = this_cpu_cpumask_var_ptr(ipi_mask);
/*
* The idea is to send one IPI per cluster.