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MIPS: Abstract CPU core & VP(E) ID access through accessor functions

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We currently have fields in struct cpuinfo_mips for the core & VP(E) ID
of a particular CPU, and various pieces of code directly access those
fields. This patch abstracts such access by introducing accessor
functions cpu_core(), cpu_set_core(), cpu_vpe_id() & cpu_set_vpe_id()
and having code that needs to access these values call those functions
rather than directly accessing the struct cpuinfo_mips fields. This
prepares us for changes to the way in which those values are stored in
later patches.

The cpu_vpe_id() function is introduced even though we already had a
cpu_vpe_id() macro for a couple of reasons:

  1) It's more consistent with the core, and future cluster, accessors.

  2) It ensures a sensible return type without explicit casts.

  3) It's generally preferable to use functions rather than macros.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17009/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2017-08-12 19:49:35 -07:00
committed by Ralf Baechle
parent 15e6529fc3
commit f875a832d2
16 changed files with 71 additions and 46 deletions
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4
arch/mips/kernel/mips-cpc.c
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@@ -86,7 +86,7 @@ void mips_cpc_lock_other(unsigned int core)
return;
preempt_disable();
curr_core = current_cpu_data.core;
curr_core = cpu_core(&current_cpu_data);
spin_lock_irqsave(&per_cpu(cpc_core_lock, curr_core),
per_cpu(cpc_core_lock_flags, curr_core));
write_cpc_cl_other(core << __ffs(CPC_Cx_OTHER_CORENUM));
@@ -106,7 +106,7 @@ void mips_cpc_unlock_other(void)
/* Systems with CM >= 3 lock the CPC via mips_cm_lock_other */
return;
curr_core = current_cpu_data.core;
curr_core = cpu_core(&current_cpu_data);
spin_unlock_irqrestore(&per_cpu(cpc_core_lock, curr_core),
per_cpu(cpc_core_lock_flags, curr_core));
preempt_enable();