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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id bi13-20020a05600c3d8d00b0040e8800fcf3sm19780908wmb.5.2024.01.22.09.37.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jan 2024 09:37:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1705945056; x=1706549856; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=6HSg0+1JZFIe/mANiKGpgt4LhNH0E2x8I+vuZEEVJHQ=; b=V0vWHlG1LDpzs+pkp3FHunZJrbQPzteSkBWXLgLYqTGlBjHBxfYvTklTAmdFVNShud Z39DCqgJLW05qDhO+qXRUsW8lqeighU1xdCO2t6pQe7Gmr+4bUO+bvLKi27je7tyEXtp VvomyWSjDWK02RansjjzQn/f9SQ8fIgSc2RAKQjDD9Jk4sq8bJJh4LHJQvFrDPnUzGjQ vb4x20AZTxFyfCc50CEXBfUo0iQT3IUhwFGlcNLK9qj2RsparlWPDIRY8xqAxFDq/POo wGs7qZZNyMZVAUeyXuu15MT+6WDuKXx5xjCYxzJ4/arnfzpnV6G5usZ+pa5O6xiu05r7 0lWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705945056; x=1706549856; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=6HSg0+1JZFIe/mANiKGpgt4LhNH0E2x8I+vuZEEVJHQ=; b=BYZVo1HZaSkP2CGgezFWVYmV3lLaJ68g/sOEOQ5gH8R0KY8dT3anDigAIkdt2OlZNH 4jBtlgyp7lHi8dKjSQ5TsMwPuWBxN4Zh5KcQMv/rIny84RUHBe0F4jhcFQlDgacXaQLO fbsgqm8DOzBYdUAHRlQaqOwR7GEaevEHU1Qtss/mGb8YHFGCN072cSSPwFdxxd3bwcGw OwGYYRbrxKc8yDmArh3AF53rs6knpMJbcH5c9yOVY1luHc4VP5FGfy5UVFVLq/gi6JXc 78Oe6tUZb3IFFNMTXlbiqtkBh8EACGgm3Y29Zx2HR7j+15r2pi8Shz3kFWNc3+Y8RIxg l2mg== X-Gm-Message-State: AOJu0Yw8kzxn6Y47lMbR7470q40VXBbpIeBCfcNS7Unp5EPO7uTa3BQa Fa5sVjtMYgp6TXmmEAZqq1QNWa4ySXsBA5omiqFZSAr2oVwPxsvfMPSwuXItnI4WlP74s3ycG+z 6 X-Google-Smtp-Source: AGHT+IGdYYmztObwaEBcQ2bmQ0HbrY6c8BlQLYg3q2KBUegAMXnvtsoQKmhlYpUXYeiYAsaA3QjbvQ== X-Received: by 2002:a7b:cb8d:0:b0:40d:5d07:55d3 with SMTP id m13-20020a7bcb8d000000b0040d5d0755d3mr1840311wmi.177.1705945056539; Mon, 22 Jan 2024 09:37:36 -0800 (PST) From: Peter Maydell To: qemu-devel@nongnu.org Cc: Ira Weiny , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Richard Henderson , Kevin Wolf Subject: [PATCH] bswap.h: Fix const_le64() macro Date: Mon, 22 Jan 2024 17:37:35 +0000 Message-Id: <20240122173735.472951-1-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 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::32f; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x32f.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: 1705945106296100001 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: Ira Weiny Reviewed-by: Kevin Wolf Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Thomas Huth --- Tested 'by hand' on the s390 box that was complaining about Kevin's pullreq. --- 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