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Message-ID: <20230515180138.516507215@redhat.com>
Date: Mon, 15 May 2023 15:00:19 -0300
From: Marcelo Tosatti <mtosatti@...hat.com>
To: Christoph Lameter <cl@...ux.com>
Cc: Aaron Tomlin <atomlin@...mlin.com>,
Frederic Weisbecker <frederic@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Russell King <linux@...linux.org.uk>,
Huacai Chen <chenhuacai@...nel.org>,
Heiko Carstens <hca@...ux.ibm.com>, x86@...nel.org,
Vlastimil Babka <vbabka@...e.cz>,
Michal Hocko <mhocko@...e.com>,
Marcelo Tosatti <mtosatti@...hat.com>
Subject: [PATCH v8 04/13] this_cpu_cmpxchg: S390: switch this_cpu_cmpxchg to locked, add _local function
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@...hat.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__; \
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