powerpc/atomics: Remove unused function

Remove arch_atomic_try_cmpxchg_lock function as it is no longer used
since commit 9f61521c7a28 ("powerpc/qspinlock: powerpc qspinlock
implementation")

Signed-off-by: Nysal Jan K.A <nysal@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230224103940.1328725-1-nysal@linux.ibm.com

diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
index 486ab78..b3a5383 100644 (file)
--- a/arch/powerpc/include/asm/atomic.h
+++ b/arch/powerpc/include/asm/atomic.h
@@ -130,35 +130,6 @@ ATOMIC_OPS(xor, xor, "", K)
 #define arch_atomic_xchg_relaxed(v, new) \
        arch_xchg_relaxed(&((v)->counter), (new))
 
-/*
- * Don't want to override the generic atomic_try_cmpxchg_acquire, because
- * we add a lock hint to the lwarx, which may not be wanted for the
- * _acquire case (and is not used by the other _acquire variants so it
- * would be a surprise).
- */
-static __always_inline bool
-arch_atomic_try_cmpxchg_lock(atomic_t *v, int *old, int new)
-{
-       int r, o = *old;
-       unsigned int eh = IS_ENABLED(CONFIG_PPC64);
-
-       __asm__ __volatile__ (
-"1:    lwarx   %0,0,%2,%[eh]   # atomic_try_cmpxchg_acquire            \n"
-"      cmpw    0,%0,%3                                                 \n"
-"      bne-    2f                                                      \n"
-"      stwcx.  %4,0,%2                                                 \n"
-"      bne-    1b                                                      \n"
-"\t"   PPC_ACQUIRE_BARRIER "                                           \n"
-"2:                                                                    \n"
-       : "=&r" (r), "+m" (v->counter)
-       : "r" (&v->counter), "r" (o), "r" (new), [eh] "n" (eh)
-       : "cr0", "memory");
-
-       if (unlikely(r != o))
-               *old = r;
-       return likely(r == o);
-}
-
 /**
  * atomic_fetch_add_unless - add unless the number is a given value
  * @v: pointer of type atomic_t