From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by sourceware.org (Postfix) with ESMTPS id 28F03385BF83 for ; Tue, 7 Apr 2020 13:33:41 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 28F03385BF83 Received: by mail-qk1-x743.google.com with SMTP id 13so1566730qko.10 for ; Tue, 07 Apr 2020 06:33:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:references:from:autocrypt:subject :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=KbUOWOJEjB04pelbOEYlfPw68PEd5GFefPQqL0uESLA=; b=GQttHDvQ/F2qsC8Zilt6o3iyQPwdaFtA+ytHsbhZqzqRPGwE7jalXj8GHZL1oM8/Lj 1nL1Uz4OBmPZyy6ODSqsXxITrq+o5AI7J9T7i2KhtwrkXRhdOXTuD5y5bry842soFPhz Xtj4c19S+SI4bCU6nau/j+bigT0DkYXLTPS/tmOA2/m2t/eONlIPiegwQejPyWNfVwBt J8yAFAr+hIEnOep45bum5WriAlQl8ek7huG+jBz90ksuVnZtQLbKLZxN2wtxpGTsPREI vMh4MX0qVZIg+PZz6x64L44yvzgQxxqG8TxqxyKqJlUZ3JyjbOWVwth5sbfQCqOskfHO uqoQ== X-Gm-Message-State: AGi0PubelVulLP8uslHYz1l9aOeVOe2LiydWZadl5m1G6gzijsNNyd0S mAn/TnNjMDS5cL6RfUpabSY6f+0sVUAejw== X-Google-Smtp-Source: APiQypIC1NC0n+6sv7c7UYNH0VZrNrRtkIizT9Jo7xf/QrQjYfjTXXnSxp6jMk7huQYmI9ig/cPzZw== X-Received: by 2002:a05:620a:ce6:: with SMTP id c6mr2254726qkj.470.1586266420361; Tue, 07 Apr 2020 06:33:40 -0700 (PDT) Received: from [192.168.1.4] ([177.194.48.209]) by smtp.googlemail.com with ESMTPSA id 31sm17034029qta.56.2020.04.07.06.33.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Apr 2020 06:33:39 -0700 (PDT) To: "H.J. Lu" Cc: Joseph Myers , GNU C Library References: <20200403203201.7494-1-adhemerval.zanella@linaro.org> <20200403203201.7494-5-adhemerval.zanella@linaro.org> <6ff26c0d-224e-5d89-3d48-8800ea9ec639@linaro.org> From: Adhemerval Zanella Autocrypt: addr=adhemerval.zanella@linaro.org; prefer-encrypt=mutual; keydata= xsFNBFcVGkoBEADiQU2x/cBBmAVf5C2d1xgz6zCnlCefbqaflUBw4hB/bEME40QsrVzWZ5Nq 8kxkEczZzAOKkkvv4pRVLlLn/zDtFXhlcvQRJ3yFMGqzBjofucOrmdYkOGo0uCaoJKPT186L NWp53SACXguFJpnw4ODI64ziInzXQs/rUJqrFoVIlrPDmNv/LUv1OVPKz20ETjgfpg8MNwG6 iMizMefCl+RbtXbIEZ3TE/IaDT/jcOirjv96lBKrc/pAL0h/O71Kwbbp43fimW80GhjiaN2y WGByepnkAVP7FyNarhdDpJhoDmUk9yfwNuIuESaCQtfd3vgKKuo6grcKZ8bHy7IXX1XJj2X/ BgRVhVgMHAnDPFIkXtP+SiarkUaLjGzCz7XkUn4XAGDskBNfbizFqYUQCaL2FdbW3DeZqNIa nSzKAZK7Dm9+0VVSRZXP89w71Y7JUV56xL/PlOE+YKKFdEw+gQjQi0e+DZILAtFjJLoCrkEX w4LluMhYX/X8XP6/C3xW0yOZhvHYyn72sV4yJ1uyc/qz3OY32CRy+bwPzAMAkhdwcORA3JPb kPTlimhQqVgvca8m+MQ/JFZ6D+K7QPyvEv7bQ7M+IzFmTkOCwCJ3xqOD6GjX3aphk8Sr0dq3 4Awlf5xFDAG8dn8Uuutb7naGBd/fEv6t8dfkNyzj6yvc4jpVxwARAQABzUlBZGhlbWVydmFs IFphbmVsbGEgTmV0dG8gKExpbmFybyBWUE4gS2V5KSA8YWRoZW1lcnZhbC56YW5lbGxhQGxp bmFyby5vcmc+wsF3BBMBCAAhBQJXFRpKAhsDBQsJCAcDBRUKCQgLBRYCAwEAAh4BAheAAAoJ EKqx7BSnlIjv0e8P/1YOYoNkvJ+AJcNUaM5a2SA9oAKjSJ/M/EN4Id5Ow41ZJS4lUA0apSXW NjQg3VeVc2RiHab2LIB4MxdJhaWTuzfLkYnBeoy4u6njYcaoSwf3g9dSsvsl3mhtuzm6aXFH /Qsauav77enJh99tI4T+58rp0EuLhDsQbnBic/ukYNv7sQV8dy9KxA54yLnYUFqH6pfH8Lly sTVAMyi5Fg5O5/hVV+Z0Kpr+ZocC1YFJkTsNLAW5EIYSP9ftniqaVsim7MNmodv/zqK0IyDB GLLH1kjhvb5+6ySGlWbMTomt/or/uvMgulz0bRS+LUyOmlfXDdT+t38VPKBBVwFMarNuREU2 69M3a3jdTfScboDd2ck1u7l+QbaGoHZQ8ZNUrzgObltjohiIsazqkgYDQzXIMrD9H19E+8fw kCNUlXxjEgH/Kg8DlpoYJXSJCX0fjMWfXywL6ZXc2xyG/hbl5hvsLNmqDpLpc1CfKcA0BkK+ k8R57fr91mTCppSwwKJYO9T+8J+o4ho/CJnK/jBy1pWKMYJPvvrpdBCWq3MfzVpXYdahRKHI ypk8m4QlRlbOXWJ3TDd/SKNfSSrWgwRSg7XCjSlR7PNzNFXTULLB34sZhjrN6Q8NQZsZnMNs TX8nlGOVrKolnQPjKCLwCyu8PhllU8OwbSMKskcD1PSkG6h3r0AqzsFNBFcVGkoBEACgAdbR Ck+fsfOVwT8zowMiL3l9a2DP3Eeak23ifdZG+8Avb/SImpv0UMSbRfnw/N81IWwlbjkjbGTu oT37iZHLRwYUFmA8fZX0wNDNKQUUTjN6XalJmvhdz9l71H3WnE0wneEM5ahu5V1L1utUWTyh VUwzX1lwJeV3vyrNgI1kYOaeuNVvq7npNR6t6XxEpqPsNc6O77I12XELic2+36YibyqlTJIQ V1SZEbIy26AbC2zH9WqaKyGyQnr/IPbTJ2Lv0dM3RaXoVf+CeK7gB2B+w1hZummD21c1Laua +VIMPCUQ+EM8W9EtX+0iJXxI+wsztLT6vltQcm+5Q7tY+HFUucizJkAOAz98YFucwKefbkTp eKvCfCwiM1bGatZEFFKIlvJ2QNMQNiUrqJBlW9nZp/k7pbG3oStOjvawD9ZbP9e0fnlWJIsj 6c7pX354Yi7kxIk/6gREidHLLqEb/otuwt1aoMPg97iUgDV5mlNef77lWE8vxmlY0FBWIXuZ yv0XYxf1WF6dRizwFFbxvUZzIJp3spAao7jLsQj1DbD2s5+S1BW09A0mI/1DjB6EhNN+4bDB SJCOv/ReK3tFJXuj/HbyDrOdoMt8aIFbe7YFLEExHpSk+HgN05Lg5TyTro8oW7TSMTk+8a5M kzaH4UGXTTBDP/g5cfL3RFPl79ubXwARAQABwsFfBBgBCAAJBQJXFRpKAhsMAAoJEKqx7BSn lIjvI/8P/jg0jl4Tbvg3B5kT6PxJOXHYu9OoyaHLcay6Cd+ZrOd1VQQCbOcgLFbf4Yr+rE9l mYsY67AUgq2QKmVVbn9pjvGsEaz8UmfDnz5epUhDxC6yRRvY4hreMXZhPZ1pbMa6A0a/WOSt AgFj5V6Z4dXGTM/lNManr0HjXxbUYv2WfbNt3/07Db9T+GZkpUotC6iknsTA4rJi6u2ls0W9 1UIvW4o01vb4nZRCj4rni0g6eWoQCGoVDk/xFfy7ZliR5B+3Z3EWRJcQskip/QAHjbLa3pml xAZ484fVxgeESOoaeC9TiBIp0NfH8akWOI0HpBCiBD5xaCTvR7ujUWMvhsX2n881r/hNlR9g fcE6q00qHSPAEgGr1bnFv74/1vbKtjeXLCcRKk3Ulw0bY1OoDxWQr86T2fZGJ/HIZuVVBf3+ gaYJF92GXFynHnea14nFFuFgOni0Mi1zDxYH/8yGGBXvo14KWd8JOW0NJPaCDFJkdS5hu0VY 7vJwKcyHJGxsCLU+Et0mryX8qZwqibJIzu7kUJQdQDljbRPDFd/xmGUFCQiQAncSilYOcxNU EMVCXPAQTteqkvA+gNqSaK1NM9tY0eQ4iJpo+aoX8HAcn4sZzt2pfUB9vQMTBJ2d4+m/qO6+ cFTAceXmIoFsN8+gFN3i8Is3u12u8xGudcBPvpoy4OoG Subject: Re: [PATCH v4 04/21] nptl: x32: Fix Race conditions in pthread cancellation [BZ#12683] Message-ID: <8fceb58e-53b4-36d6-7a46-f787a8f141be@linaro.org> Date: Tue, 7 Apr 2020 10:33:36 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-13.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Apr 2020 13:33:42 -0000 On 07/04/2020 09:54, H.J. Lu wrote: > On Tue, Apr 7, 2020 at 5:47 AM Adhemerval Zanella via Libc-alpha > wrote: >> >> >> >> On 03/04/2020 18:22, Joseph Myers wrote: >>> On Fri, 3 Apr 2020, Adhemerval Zanella via Libc-alpha wrote: >>> >>>> This patches adds the x32 modification required for the BZ#12683. >>>> It follows the x86_64-x32 ABI and pointers are zero-extended. >>>> However, compiler may not see such cases and accuse a cast from pointer >>>> to integer of different size and for such cases the warning is >>>> explict disabled. >>> >>> MIPS n32 uses an intermediate cast to (__typeof__ ((X) - (X))), so that a >>> conversion to a different size is never directly from a pointer type. >>> Does something like that help here to avoid the warning without needing to >>> use diagnostic pragmas? >> >> The intermediate cast to (__typeof__ ((X) - (X))) is not suffice for x32 >> (the resulting argumetn it will passed as function argument instead of >> asm input). I have replaced with: >> >> #define __SSC(__x) \ >> ({ \ >> __syscall_arg_t __arg = sizeof (1 ? (__x) : 0ULL) < 8 \ >> ? (unsigned long int) (uintptr_t)(__x) \ >> : (__syscall_arg_t) (__typeof__ ((__x) - (__x))) (__x); \ >> __arg; \ >> }) >> > > Have you looked at libc-pointer-arith.h? That was my first approach, by using cast_to_integer macro. I tried to change its internals to zero extend pointers correctly, but I couldn't find a easier way without also adding the cast point suppression warning in this original patch.