From: Nicholas Piggin <npiggin@gmail.com>
To: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: mpe@ellerman.id.au, benh@kernel.crashing.org, anton@samba.org,
paulus@samba.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v9 14/14] powerpc: rewrite local_t using soft_irq
Date: Fri, 4 Aug 2017 03:50:05 +1000 [thread overview]
Message-ID: <20170804035005.1d462325@roar.ozlabs.ibm.com> (raw)
In-Reply-To: <1501732158-19009-15-git-send-email-maddy@linux.vnet.ibm.com>
On Thu, 3 Aug 2017 09:19:18 +0530
Madhavan Srinivasan <maddy@linux.vnet.ibm.com> wrote:
> @@ -14,6 +17,202 @@ typedef struct
> #define local_read(l) atomic_long_read(&(l)->a)
> #define local_set(l,i) atomic_long_set(&(l)->a, (i))
>
> +#ifdef CONFIG_PPC64
> +
> +static __inline__ void local_add(long i, local_t *l)
> +{
> + long t;
> + unsigned long flags;
> +
> + powerpc_local_irq_pmu_save(flags);
> + __asm__ __volatile__(
> + PPC_LL" %0,0(%2)\n\
> + add %0,%1,%0\n"
> + PPC_STL" %0,0(%2)\n"
> + : "=&r" (t)
> + : "r" (i), "r" (&(l->a.counter)));
> + powerpc_local_irq_pmu_restore(flags);
> +}
Hey, so... why are any of these implemented in asm? We should
just do them all in C, right? I looked a bit harder at code gen
and a couple of them are still emitting larx/stcx.
> +
> +#define local_cmpxchg(l, o, n) \
> + (cmpxchg_local(&((l)->a.counter), (o), (n)))
> +#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
e.g., these.
Thanks,
Nick
next prev parent reply other threads:[~2017-08-03 17:50 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-03 3:49 [PATCH v9 00/14]powerpc: "paca->soft_enabled" based local atomic operation implementation Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 01/14] powerpc: Add #defs for paca->soft_enabled flags Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 02/14] powerpc: move set_soft_enabled() and rename Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 03/14] powerpc: Use soft_enabled_set api to update paca->soft_enabled Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 04/14] powerpc: Add soft_enabled manipulation functions Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 05/14] powerpc/irq: Cleanup hard_irq_disable() macro Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 06/14] powerpc/irq: Fix arch_local_irq_disable() in book3s Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 07/14] powerpc: Modify soft_enable from flag to mask Madhavan Srinivasan
2017-08-03 4:44 ` Nicholas Piggin
2017-08-03 3:49 ` [PATCH v9 08/14] powerpc: Rename soft_enabled to soft_disable_mask Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 09/14] powerpc: Avoid using EXCEPTION_PROLOG_1 macro in MASKABLE_* Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 10/14] powerpc: Add support to take additional parameter in MASKABLE_* macro Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 11/14] Add support to mask perf interrupts and replay them Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 12/14] powerpc:Add new kconfig IRQ_DEBUG_SUPPORT Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 13/14] powerpc: Add new set of soft_disable_mask_ functions Madhavan Srinivasan
2017-08-03 3:49 ` [PATCH v9 14/14] powerpc: rewrite local_t using soft_irq Madhavan Srinivasan
2017-08-03 17:50 ` Nicholas Piggin [this message]
2017-08-04 1:40 ` Benjamin Herrenschmidt
2017-08-04 9:04 ` Nicholas Piggin
2017-08-04 15:18 ` David Laight
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