From nobody Fri Dec 26 17:21:00 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 89B3F1C693 for ; Wed, 3 Jan 2024 16:32:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="e5wX4zr7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1704299566; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=n/sNmacMSvCkIR374aY0S9uvqtL96KdIcIOWwUR3yYE=; b=e5wX4zr74cnSpHisEyX80UxPFUYycrUWb3Z7yZulC9Xk/VybiUnJRNfofIh6F8N+sTfb9Q rIvxMkk5TCBoUyiUODy78RZvfIQapN9U8WuiM0NBKtg2zjAoU+yrV6J7DfC7vuOVmHqhSy hX0l7jhElbYw74m0FosisPEr1fl/Sys= Received: from mail-pg1-f197.google.com (mail-pg1-f197.google.com [209.85.215.197]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-594-_r9DBviyMvC-QBE9b1e_Ew-1; Wed, 03 Jan 2024 11:32:45 -0500 X-MC-Unique: _r9DBviyMvC-QBE9b1e_Ew-1 Received: by mail-pg1-f197.google.com with SMTP id 41be03b00d2f7-5ce632b2adfso4302804a12.0 for ; Wed, 03 Jan 2024 08:32:44 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704299563; x=1704904363; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=n/sNmacMSvCkIR374aY0S9uvqtL96KdIcIOWwUR3yYE=; b=L56TUozV45UsNHhQzQSC5AOuWy1Ia4QzlHkGDO09nPRkHJRV2AaYgFtnJgJ+EgUsU2 WUpB/foamYEvd4bJyPdvBmArPBYyEnrlH61iErhpPfwzecb/z+VQj4+03nEc6MZri2VC l1eKgNsTH4Ah9oHL5rCqGcHZ9nUfkGSz25SIZ/+J2qaIh8oBnRfvPcOkhz2t+4ZmTgvf NCcRQoLvRLr6Si4bBdqT/t4usuvAN5abxx9y4eSoB+ufKduHyKb7L6gzveRWTz4iQvAi oWU+JSBGi8vlucCrs/VxJeTbaftTqtlf2onrVOukDOCPHpoUtYJWzoGKUQzDrwydZD/Y 9DbQ== X-Gm-Message-State: AOJu0Yyp5eow9g+SVtgfW4M+RLoTLz524ZpH91OhgZahwf95swa69NUX IJ6cihyCAhAfmOVxoaT2NwgrNplR4ISvHbeH0cibV6SOTpqSQAA5aEw6ejRVeV9OHK5RfCoWOyF HS5WFOVP21Upvgmm5AHtTHNUgG8TZpmRr X-Received: by 2002:a17:902:64c2:b0:1d4:87c8:40f9 with SMTP id y2-20020a17090264c200b001d487c840f9mr10868120pli.84.1704299563376; Wed, 03 Jan 2024 08:32:43 -0800 (PST) X-Google-Smtp-Source: AGHT+IEk9KLzHdKrTHSS/KtZZppx+0qxHeyY2aaqvlMhT293khOuYzfSNdLjxjc3JpSL3I6Ppc3weQ== X-Received: by 2002:a17:902:64c2:b0:1d4:87c8:40f9 with SMTP id y2-20020a17090264c200b001d487c840f9mr10868097pli.84.1704299563019; Wed, 03 Jan 2024 08:32:43 -0800 (PST) Received: from localhost.localdomain ([2804:431:c7ec:911:6911:ca60:846:eb46]) by smtp.gmail.com with ESMTPSA id e12-20020a170902b78c00b001cfca7b8ee7sm23930425pls.99.2024.01.03.08.32.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jan 2024 08:32:42 -0800 (PST) From: Leonardo Bras To: Will Deacon , Peter Zijlstra , Boqun Feng , Mark Rutland , Paul Walmsley , Palmer Dabbelt , Albert Ou , Leonardo Bras , Guo Ren , Andrea Parri , Geert Uytterhoeven , Ingo Molnar , Andrzej Hajda Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v1 2/5] riscv/cmpxchg: Deduplicate cmpxchg() asm and macros Date: Wed, 3 Jan 2024 13:32:00 -0300 Message-ID: <20240103163203.72768-4-leobras@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240103163203.72768-2-leobras@redhat.com> References: <20240103163203.72768-2-leobras@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this header every cmpxchg define (_relaxed, _acquire, _release, vanilla) contain it's own asm file, both for 4-byte variables an 8-byte variables, on a total of 8 versions of mostly the same asm. This is usually bad, as it means any change may be done in up to 8 different places. Unify those versions by creating a new define with enough parameters to generate any version of the previous 8. Then unify the result under a more general define, and simplify arch_cmpxchg* generation (This did not cause any change in generated asm) Signed-off-by: Leonardo Bras Reviewed-by: Guo Ren Reviewed-by: Andrea Parri Tested-by: Guo Ren --- arch/riscv/include/asm/cmpxchg.h | 195 ++++++------------------------- 1 file changed, 33 insertions(+), 162 deletions(-) diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpx= chg.h index 48478a8eecee7..e3e0ac7ba061b 100644 --- a/arch/riscv/include/asm/cmpxchg.h +++ b/arch/riscv/include/asm/cmpxchg.h @@ -71,190 +71,61 @@ * store NEW in MEM. Return the initial value in MEM. Success is * indicated by comparing RETURN with OLD. */ -#define __cmpxchg_relaxed(ptr, old, new, size) \ -({ \ - __typeof__(ptr) __ptr =3D (ptr); \ - __typeof__(*(ptr)) __old =3D (old); \ - __typeof__(*(ptr)) __new =3D (new); \ - __typeof__(*(ptr)) __ret; \ - register unsigned int __rc; \ - switch (size) { \ - case 4: \ - __asm__ __volatile__ ( \ - "0: lr.w %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.w %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" ((long)__old), "rJ" (__new) \ - : "memory"); \ - break; \ - case 8: \ - __asm__ __volatile__ ( \ - "0: lr.d %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.d %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" (__old), "rJ" (__new) \ - : "memory"); \ - break; \ - default: \ - BUILD_BUG(); \ - } \ - __ret; \ -}) =20 -#define arch_cmpxchg_relaxed(ptr, o, n) \ -({ \ - __typeof__(*(ptr)) _o_ =3D (o); \ - __typeof__(*(ptr)) _n_ =3D (n); \ - (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \ - _o_, _n_, sizeof(*(ptr))); \ -}) =20 -#define __cmpxchg_acquire(ptr, old, new, size) \ +#define __arch_cmpxchg(lr_sfx, sc_sfx, prepend, append, r, p, co, o, n) \ ({ \ - __typeof__(ptr) __ptr =3D (ptr); \ - __typeof__(*(ptr)) __old =3D (old); \ - __typeof__(*(ptr)) __new =3D (new); \ - __typeof__(*(ptr)) __ret; \ register unsigned int __rc; \ - switch (size) { \ - case 4: \ - __asm__ __volatile__ ( \ - "0: lr.w %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.w %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - RISCV_ACQUIRE_BARRIER \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" ((long)__old), "rJ" (__new) \ - : "memory"); \ - break; \ - case 8: \ - __asm__ __volatile__ ( \ - "0: lr.d %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.d %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - RISCV_ACQUIRE_BARRIER \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" (__old), "rJ" (__new) \ - : "memory"); \ - break; \ - default: \ - BUILD_BUG(); \ - } \ - __ret; \ -}) - -#define arch_cmpxchg_acquire(ptr, o, n) \ -({ \ - __typeof__(*(ptr)) _o_ =3D (o); \ - __typeof__(*(ptr)) _n_ =3D (n); \ - (__typeof__(*(ptr))) __cmpxchg_acquire((ptr), \ - _o_, _n_, sizeof(*(ptr))); \ + \ + __asm__ __volatile__ ( \ + prepend \ + "0: lr" lr_sfx " %0, %2\n" \ + " bne %0, %z3, 1f\n" \ + " sc" sc_sfx " %1, %z4, %2\n" \ + " bnez %1, 0b\n" \ + append \ + "1:\n" \ + : "=3D&r" (r), "=3D&r" (__rc), "+A" (*(p)) \ + : "rJ" (co o), "rJ" (n) \ + : "memory"); \ }) =20 -#define __cmpxchg_release(ptr, old, new, size) \ +#define _arch_cmpxchg(ptr, old, new, sc_sfx, prepend, append) \ ({ \ __typeof__(ptr) __ptr =3D (ptr); \ - __typeof__(*(ptr)) __old =3D (old); \ - __typeof__(*(ptr)) __new =3D (new); \ - __typeof__(*(ptr)) __ret; \ - register unsigned int __rc; \ - switch (size) { \ + __typeof__(*(__ptr)) __old =3D (old); \ + __typeof__(*(__ptr)) __new =3D (new); \ + __typeof__(*(__ptr)) __ret; \ + \ + switch (sizeof(*__ptr)) { \ case 4: \ - __asm__ __volatile__ ( \ - RISCV_RELEASE_BARRIER \ - "0: lr.w %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.w %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" ((long)__old), "rJ" (__new) \ - : "memory"); \ + __arch_cmpxchg(".w", ".w" sc_sfx, prepend, append, \ + __ret, __ptr, (long), __old, __new); \ break; \ case 8: \ - __asm__ __volatile__ ( \ - RISCV_RELEASE_BARRIER \ - "0: lr.d %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.d %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" (__old), "rJ" (__new) \ - : "memory"); \ + __arch_cmpxchg(".d", ".d" sc_sfx, prepend, append, \ + __ret, __ptr, /**/, __old, __new); \ break; \ default: \ BUILD_BUG(); \ } \ - __ret; \ + (__typeof__(*(__ptr)))__ret; \ }) =20 -#define arch_cmpxchg_release(ptr, o, n) \ -({ \ - __typeof__(*(ptr)) _o_ =3D (o); \ - __typeof__(*(ptr)) _n_ =3D (n); \ - (__typeof__(*(ptr))) __cmpxchg_release((ptr), \ - _o_, _n_, sizeof(*(ptr))); \ -}) +#define arch_cmpxchg_relaxed(ptr, o, n) \ + _arch_cmpxchg((ptr), (o), (n), "", "", "") =20 -#define __cmpxchg(ptr, old, new, size) \ -({ \ - __typeof__(ptr) __ptr =3D (ptr); \ - __typeof__(*(ptr)) __old =3D (old); \ - __typeof__(*(ptr)) __new =3D (new); \ - __typeof__(*(ptr)) __ret; \ - register unsigned int __rc; \ - switch (size) { \ - case 4: \ - __asm__ __volatile__ ( \ - "0: lr.w %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.w.rl %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - " fence rw, rw\n" \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" ((long)__old), "rJ" (__new) \ - : "memory"); \ - break; \ - case 8: \ - __asm__ __volatile__ ( \ - "0: lr.d %0, %2\n" \ - " bne %0, %z3, 1f\n" \ - " sc.d.rl %1, %z4, %2\n" \ - " bnez %1, 0b\n" \ - " fence rw, rw\n" \ - "1:\n" \ - : "=3D&r" (__ret), "=3D&r" (__rc), "+A" (*__ptr) \ - : "rJ" (__old), "rJ" (__new) \ - : "memory"); \ - break; \ - default: \ - BUILD_BUG(); \ - } \ - __ret; \ -}) +#define arch_cmpxchg_acquire(ptr, o, n) \ + _arch_cmpxchg((ptr), (o), (n), "", "", RISCV_ACQUIRE_BARRIER) + +#define arch_cmpxchg_release(ptr, o, n) \ + _arch_cmpxchg((ptr), (o), (n), "", RISCV_RELEASE_BARRIER, "") =20 #define arch_cmpxchg(ptr, o, n) \ -({ \ - __typeof__(*(ptr)) _o_ =3D (o); \ - __typeof__(*(ptr)) _n_ =3D (n); \ - (__typeof__(*(ptr))) __cmpxchg((ptr), \ - _o_, _n_, sizeof(*(ptr))); \ -}) + _arch_cmpxchg((ptr), (o), (n), ".rl", "", " fence rw, rw\n") =20 #define arch_cmpxchg_local(ptr, o, n) \ - (__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr)))) + arch_cmpxchg_relaxed((ptr), (o), (n)) =20 #define arch_cmpxchg64(ptr, o, n) \ ({ \ --=20 2.43.0