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powerpc: use spin loop primitives in some functions

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Use the different spin loop primitives in some simple powerpc
spin loops, including those which will spin as a common case.

This will help to test the spin loop primitives before more
conversions are done.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Add some includes of <linux/processor.h>]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2017-06-06 23:08:32 +10:00
committed by Michael Ellerman
parent ede8e2bbb0
commit 4e287e655e
4 changed files with 23 additions and 10 deletions
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5
arch/powerpc/mm/hash_native_64.c
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@@ -15,6 +15,7 @@
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/of.h>
#include <linux/processor.h>
#include <linux/threads.h>
#include <linux/smp.h>
@@ -184,8 +185,10 @@ static inline void native_lock_hpte(struct hash_pte *hptep)
while (1) {
if (!test_and_set_bit_lock(HPTE_LOCK_BIT, word))
break;
spin_begin();
while(test_bit(HPTE_LOCK_BIT, word))
cpu_relax();
spin_cpu_relax();
spin_end();
}
}