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Mon, 13 Mar 2023 13:26:44 -0300 (-03) Message-ID: <20230313162634.309252817@redhat.com> User-Agent: quilt/0.67 Date: Mon, 13 Mar 2023 13:25:09 -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, Vlastimil Babka , Marcelo Tosatti Subject: [PATCH v5 02/12] this_cpu_cmpxchg: loongarch: switch this_cpu_cmpxchg to locked, add _local function References: <20230313162507.032200398@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: BAE201C000E X-Rspam-User: X-Stat-Signature: p1jm4cxgw6uxco1zfikibwef1t8yutkn X-HE-Tag: 1678724866-395030 X-HE-Meta: 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 wyy+rN9F y90wA5/3CQEu+YvK29RaHJgQfisQLPMlhcwpbCbvNBwt4FDh2xAjiEJo7gcULoltJ8YjkHmzzZGmsPCFiiHLxNCcVIGXZakDN8pvSNOVkoLpqMrHL5wu37050pDvneZazI/JyFYH65rlUR4MMCU/bSkBK+0lDQ5ZzMiSvmfJSvqU48JUODeR/0EJ+jyXl4RqhrgX1TAEdTS6NTK+EQqEhHd0R3f7Wnt2RueblrHyHiNcUlTNyu1cthKBFEA== 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