Re: [PATCH] powerpc/atomics: Remove unused function

[Christophe Leroy <christophe.leroy@csgroup.eu>]

Le 24/02/2023 à 11:39, Nysal Jan K.A a écrit :
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> 
> 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>

> ---
>   arch/powerpc/include/asm/atomic.h | 29 -----------------------------
>   1 file changed, 29 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
> index 486ab7889121..b3a53830446b 100644
> --- 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
> --
> 2.39.2
>