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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id n5-20020a5d4845000000b00337f722e5ccsm1396207wrs.65.2024.01.26.06.33.57 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jan 2024 06:33:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1706279638; x=1706884438; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=28nbiWFQ3dXc2wMfXx4/3I1JNB6kABMI1o1Dd2Ej4Ok=; b=YXVVmRfMnPNwIz5OvFi1mkRn59oMkASYDDtWUrRnlC34BDVQDHjGIQJlxfALkxm7vL o2xIxZ4hiLn3l+SKPxmRZjaFN/JWKxD28bOKGxUVBZuBaLMZStCDFsKVLxyScOlm5tTy Qe6SM0hsQwYN8p1JHWOV3lv/szQZBRhjSt+2iNra6iHV3EXgTdQE1sjOb15R8NRpj+jk aMYyFWkGEtl9gB8bk8LtJ6jveSl4kHINKtuuEttpwyhvQsKOx5JKp8sxfiCVvpkVM6z6 ZeF9bMGOyITPTc4hFknoZCI+pl5TIHj4Z3Tb3Ob2mQ5CJRZW2zv5hSev246bxSUYXE8J IDbg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706279638; x=1706884438; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=28nbiWFQ3dXc2wMfXx4/3I1JNB6kABMI1o1Dd2Ej4Ok=; b=YxzH+YPAu2q48YLDct/41lNmtn9STsPiu5s5QUR853sAiik7mBEJ8Uk1zyej2416Q4 oFwfalG+UezCyGWHlnU8PkvleMFhCQL7xbbz+4xjdAPxTb6DYX+TcfpD8EBGoW9Nw3sY 7QHi76S7vmn6ZEVhj3C8M9gLDUKe4l75/4/sXVkA8/qOiLeFS39SLfxfA8PgKE0d2OaD vNBNX1nTP6QXqEVN/BTt54TljdA5E/fMRgyi4lusXBi22oM8XtHOGg+vAZ2HkOfYNVnq SVrxDLXOmqYYzDc5eVR/I+WRfluzCVculJilwQ0srj1Z3vAaCBOsbWupIWUhcRjTHgs7 BmPg== X-Gm-Message-State: AOJu0Yy4lC36GSOtL1fqTjc/pRCIFw4fSySePI1yLIZjfL/R6l1iJeey P2/4SqU3/amVO0W1jvG0RatiP/5pWT2QrH/jTcl4IQ7wPM3anUa7m0loEfUEiNeORSUjeHSNrA8 2 X-Google-Smtp-Source: AGHT+IFOfNiYrNmobatReAw0ULuW1hKCIhApIbEgmXU7B5i9gurHKy8t1YI/+quUBvUSSqpEB8Vmtg== X-Received: by 2002:adf:f88e:0:b0:337:d649:da70 with SMTP id u14-20020adff88e000000b00337d649da70mr834366wrp.138.1706279637863; Fri, 26 Jan 2024 06:33:57 -0800 (PST) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 34/36] bswap.h: Fix const_le64() macro Date: Fri, 26 Jan 2024 14:33:39 +0000 Message-Id: <20240126143341.2101237-35-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240126143341.2101237-1-peter.maydell@linaro.org> References: <20240126143341.2101237-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::433; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x433.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1706279768702100003 The const_le64() macro introduced in commit 845d80a8c7b187 turns out to have a bug which means that on big-endian systems the compiler complains if the argument isn't already a 64-bit type. This hasn't caused a problem yet, because there are no in-tree uses, but it means it's not possible for anybody to add one without it failing CI. This example is from an attempted use of it with the argument '0', from the s390 CI runner's gcc: ../block/blklogwrites.c: In function =E2=80=98blk_log_writes_co_do_log=E2= =80=99: ../include/qemu/bswap.h:148:36: error: left shift count >=3D width of type [-Werror=3Dshift-count-overflow] 148 | ((((_x) & 0x00000000000000ffU) << 56) | \ | ^~ ../block/blklogwrites.c:409:27: note: in expansion of macro =E2=80=98const_= le64=E2=80=99 409 | .nr_entries =3D const_le64(0), | ^~~~~~~~~~ ../include/qemu/bswap.h:149:36: error: left shift count >=3D width of type [-Werror=3Dshift-count-overflow] 149 | (((_x) & 0x000000000000ff00U) << 40) | \ | ^~ ../block/blklogwrites.c:409:27: note: in expansion of macro =E2=80=98const_= le64=E2=80=99 409 | .nr_entries =3D const_le64(0), | ^~~~~~~~~~ cc1: all warnings being treated as errors Fix this by making all the constants in the macro have the ULL suffix. This will cause them all to be 64-bit integers, which means the result of the logical & will also be an unsigned 64-bit type, even if the input to the macro is a smaller type, and so the shifts will be in range. Fixes: 845d80a8c7b187 ("qemu/bswap: Add const_le64()") Signed-off-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Thomas Huth Reviewed-by: Kevin Wolf Reviewed-by: Ira Weiny Message-id: 20240122173735.472951-1-peter.maydell@linaro.org --- include/qemu/bswap.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h index 933a66ee87e..bd67468e5e4 100644 --- a/include/qemu/bswap.h +++ b/include/qemu/bswap.h @@ -145,14 +145,14 @@ CPU_CONVERT(le, 64, uint64_t) */ #if HOST_BIG_ENDIAN # define const_le64(_x) \ - ((((_x) & 0x00000000000000ffU) << 56) | \ - (((_x) & 0x000000000000ff00U) << 40) | \ - (((_x) & 0x0000000000ff0000U) << 24) | \ - (((_x) & 0x00000000ff000000U) << 8) | \ - (((_x) & 0x000000ff00000000U) >> 8) | \ - (((_x) & 0x0000ff0000000000U) >> 24) | \ - (((_x) & 0x00ff000000000000U) >> 40) | \ - (((_x) & 0xff00000000000000U) >> 56)) + ((((_x) & 0x00000000000000ffULL) << 56) | \ + (((_x) & 0x000000000000ff00ULL) << 40) | \ + (((_x) & 0x0000000000ff0000ULL) << 24) | \ + (((_x) & 0x00000000ff000000ULL) << 8) | \ + (((_x) & 0x000000ff00000000ULL) >> 8) | \ + (((_x) & 0x0000ff0000000000ULL) >> 24) | \ + (((_x) & 0x00ff000000000000ULL) >> 40) | \ + (((_x) & 0xff00000000000000ULL) >> 56)) # define const_le32(_x) \ ((((_x) & 0x000000ffU) << 24) | \ (((_x) & 0x0000ff00U) << 8) | \ --=20 2.34.1