[v2,04/11] this_cpu_cmpxchg: S390: switch this_cpu_cmpxchg to locked, add _local function
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Date: Thu, 09 Feb 2023 12:01:54 -0300
From: Marcelo Tosatti <mtosatti@redhat.com>
To: Christoph Lameter <cl@linux.com>
Cc: Aaron Tomlin <atomlin@atomlin.com>,
Frederic Weisbecker <frederic@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH v2 04/11] this_cpu_cmpxchg: S390: switch this_cpu_cmpxchg to
locked, add _local function
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| Series |
fold per-CPU vmstats remotely
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Commit Message
Marcelo Tosatti
Feb. 9, 2023, 3:01 p.m. UTC
Goal is to have vmstat_shepherd to transfer from
per-CPU counters to global counters remotely. For this,
an atomic this_cpu_cmpxchg is necessary.
Following the kernel convention for cmpxchg/cmpxchg_local,
add S390's this_cpu_cmpxchg_local.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Index: linux-vmstat-remote/arch/s390/include/asm/percpu.h =================================================================== --- linux-vmstat-remote.orig/arch/s390/include/asm/percpu.h +++ linux-vmstat-remote/arch/s390/include/asm/percpu.h @@ -148,6 +148,11 @@ #define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval) #define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval) +#define this_cpu_cmpxchg_local_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval) +#define this_cpu_cmpxchg_local_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval) +#define this_cpu_cmpxchg_local_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval) +#define this_cpu_cmpxchg_local_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval) + #define arch_this_cpu_xchg(pcp, nval) \ ({ \ typeof(pcp) *ptr__; \