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Fri, 3 Mar 2023 17:00:12 -0300 (-03) Message-ID: <20230303195908.826802488@redhat.com> User-Agent: quilt/0.67 Date: Fri, 03 Mar 2023 16:58:44 -0300 From: Marcelo Tosatti To: Christoph Lameter Cc: Aaron Tomlin , Frederic Weisbecker , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Russell King , Huacai Chen , Heiko Carstens , x86@kernel.org, Marcelo Tosatti Subject: [PATCH v3 03/11] this_cpu_cmpxchg: loongarch: switch this_cpu_cmpxchg to locked, add _local function References: <20230303195841.310844446@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Rspam-User: X-Rspamd-Queue-Id: B99DD10002B X-Rspamd-Server: rspam01 X-Stat-Signature: c4qox3nt9moc147rabu3wixkimahq4ny X-HE-Tag: 1677873636-257313 X-HE-Meta: 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 anQFkDtP UuSlNi5ddVGSfvCqDV76qBM88I4o7hiwo9Blekj5yYflDVuFFSoPTJ2s1QW0wR01BYhr6r3msqN1+eai2MkQgb8yOOV1bnsve8dbLbyVwLN2OJoU7S9/o6XkWjmeICyBBjlA5aVgaW5pbHPVlwDJ7ZtOh2ND9Mn76ZlY9i7udzvK0G06MvjvoIx54eZ0TBAx4RuBS04KUx9ikEG9qeTcjqS7UD9ZoKnZ8zKdMeqxchUejjdOthJ5BnYKE8w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 this_cpu_cmpxchg_local helpers to Loongarch. Signed-off-by: Marcelo Tosatti Index: linux-vmstat-remote/arch/loongarch/include/asm/percpu.h =================================================================== --- linux-vmstat-remote.orig/arch/loongarch/include/asm/percpu.h +++ linux-vmstat-remote/arch/loongarch/include/asm/percpu.h @@ -150,6 +150,16 @@ static inline unsigned long __percpu_xch } /* this_cpu_cmpxchg */ +#define _protect_cmpxchg(pcp, o, n) \ +({ \ + typeof(*raw_cpu_ptr(&(pcp))) __ret; \ + preempt_disable_notrace(); \ + __ret = cmpxchg(raw_cpu_ptr(&(pcp)), o, n); \ + preempt_enable_notrace(); \ + __ret; \ +}) + +/* this_cpu_cmpxchg_local */ #define _protect_cmpxchg_local(pcp, o, n) \ ({ \ typeof(*raw_cpu_ptr(&(pcp))) __ret; \ @@ -222,10 +232,15 @@ do { \ #define this_cpu_xchg_4(pcp, val) _percpu_xchg(pcp, val) #define this_cpu_xchg_8(pcp, val) _percpu_xchg(pcp, val) -#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) -#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) -#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) -#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_local_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_local_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_local_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_local_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) + +#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg(ptr, o, n) +#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg(ptr, o, n) +#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg(ptr, o, n) +#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg(ptr, o, n) #include