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powerpc: Abstract indexing of lppaca structs

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Currently we have the lppaca structs as a simple array of NR_CPUS
entries, taking up space in the data section of the kernel image.
In future we would like to allocate them dynamically, so this
abstracts out the accesses to the array, making it easier to
change how we locate the lppaca for a given cpu in future.
Specifically, lppaca[cpu] changes to lppaca_of(cpu).

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras 2010-08-12 20:18:15 +00:00 • committed by Benjamin Herrenschmidt
parent e1f0ece113
commit 8154c5d22d
7 changed files with 20 additions and 18 deletions
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4
arch/powerpc/lib/locks.c
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@ -34,7 +34,7 @@ void __spin_yield(arch_spinlock_t *lock)
return;
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
yield_count = lppaca[holder_cpu].yield_count;
yield_count = lppaca_of(holder_cpu).yield_count;
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();
@ -65,7 +65,7 @@ void __rw_yield(arch_rwlock_t *rw)
return; /* no write lock at present */
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
yield_count = lppaca[holder_cpu].yield_count;
yield_count = lppaca_of(holder_cpu).yield_count;
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();