* [PATCH] powerpc/atomics: Remove unused function
@ 2023-02-24 10:39 Nysal Jan K.A
2023-02-24 11:02 ` Christophe Leroy
2023-04-06 1:09 ` Michael Ellerman
0 siblings, 2 replies; 4+ messages in thread
From: Nysal Jan K.A @ 2023-02-24 10:39 UTC (permalink / raw)
To: Michael Ellerman
Cc: Mark Rutland, Peter Zijlstra, linuxppc-dev, Boqun Feng,
linux-kernel, Nicholas Piggin, Nysal Jan K.A, Will Deacon
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>
---
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
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] powerpc/atomics: Remove unused function
2023-02-24 10:39 [PATCH] powerpc/atomics: Remove unused function Nysal Jan K.A
@ 2023-02-24 11:02 ` Christophe Leroy
2023-03-24 1:14 ` Nysal Jan K.A.
2023-04-06 1:09 ` Michael Ellerman
1 sibling, 1 reply; 4+ messages in thread
From: Christophe Leroy @ 2023-02-24 11:02 UTC (permalink / raw)
To: Nysal Jan K.A, Michael Ellerman
Cc: Mark Rutland, Peter Zijlstra, linuxppc-dev, Boqun Feng,
linux-kernel, Nicholas Piggin, Will Deacon
Le 24/02/2023 à 11:39, Nysal Jan K.A a écrit :
> [Vous ne recevez pas souvent de courriers de nysal@linux.ibm.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
>
> 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
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] powerpc/atomics: Remove unused function
2023-02-24 11:02 ` Christophe Leroy
@ 2023-03-24 1:14 ` Nysal Jan K.A.
0 siblings, 0 replies; 4+ messages in thread
From: Nysal Jan K.A. @ 2023-03-24 1:14 UTC (permalink / raw)
To: Michael Ellerman; +Cc: linuxppc-dev
Michael,
Any comments on this one?
On Fri, Feb 24, 2023 at 11:02:31AM +0000, Christophe Leroy wrote:
>
>
> Le 24/02/2023 à 11:39, Nysal Jan K.A a écrit :
> > [Vous ne recevez pas souvent de courriers de nysal@linux.ibm.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> >
> > 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
> >
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] powerpc/atomics: Remove unused function
2023-02-24 10:39 [PATCH] powerpc/atomics: Remove unused function Nysal Jan K.A
2023-02-24 11:02 ` Christophe Leroy
@ 2023-04-06 1:09 ` Michael Ellerman
1 sibling, 0 replies; 4+ messages in thread
From: Michael Ellerman @ 2023-04-06 1:09 UTC (permalink / raw)
To: Michael Ellerman, Nysal Jan K.A
Cc: Mark Rutland, Peter Zijlstra, linuxppc-dev, Boqun Feng,
linux-kernel, Nicholas Piggin, Will Deacon
On Fri, 24 Feb 2023 16:09:40 +0530, Nysal Jan K.A wrote:
> Remove arch_atomic_try_cmpxchg_lock function as it is no longer used
> since commit 9f61521c7a28 ("powerpc/qspinlock: powerpc qspinlock
> implementation")
>
>
Applied to powerpc/next.
[1/1] powerpc/atomics: Remove unused function
https://git.kernel.org/powerpc/c/b0bbe5a2915201e3231e788d716d39dc54493b03
cheers
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-02-24 10:39 [PATCH] powerpc/atomics: Remove unused function Nysal Jan K.A
2023-02-24 11:02 ` Christophe Leroy
2023-03-24 1:14 ` Nysal Jan K.A.
2023-04-06 1:09 ` Michael Ellerman
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