[{"id":1772619,"web_url":"http://patchwork.ozlabs.org/comment/1772619/","msgid":"<20170921093808.GE773@jagdpanzerIV.localdomain>","date":"2017-09-21T09:38:08","subject":"Re: [RFC][PATCH v2 6/7] symbol lookup: use new kernel and module\n\tdereference functions","submitter":{"id":67261,"url":"http://patchwork.ozlabs.org/api/people/67261/","name":"Sergey Senozhatsky","email":"sergey.senozhatsky.work@gmail.com"},"content":"On (09/21/17 01:29), Sergey Senozhatsky wrote:\n[..]\n> +\t%pS\tversatile_init+0x0/0x110\n> +\t%ps\tversatile_init\n> \t%pF\tversatile_init+0x0/0x110\n> \t%pf\tversatile_init\n> -\t%pS\tversatile_init+0x0/0x110\n> \t%pSR\tversatile_init+0x9/0x110\n> \t\t(with __builtin_extract_return_addr() translation)\n> -\t%ps\tversatile_init\n> \t%pB\tprev_fn_of_versatile_init+0x88/0x88\n> \n> -The ``F`` and ``f`` specifiers are for printing function pointers,\n> -for example, f->func, &gettimeofday. They have the same result as\n> -``S`` and ``s`` specifiers. But they do an extra conversion on\n> -ia64, ppc64 and parisc64 architectures where the function pointers\n> -are actually function descriptors.\n> -\n> The ``S`` and ``s`` specifiers can be used for printing symbols\n> from direct addresses, for example, __builtin_return_address(0),\n> (void *)regs->ip. They result in the symbol name with (``S``) or\n> without (``s``) offsets. If KALLSYMS are disabled then the symbol\n> address is printed instead.\n> \n> +Note, that the ``F`` and ``f`` specifiers are identical to ``S`` (``s``)\n> +and thus deprecated.\n\nJFI,\n\nI have updated this part. it's probably too early to completely\nwipe out pF/pf info.\n\nthe updated Doc goes like this:\n\n+Note, that the ``F`` and ``f`` specifiers are identical to ``S`` (``s``)\n+and thus deprecated. We have ``F`` and ``f`` because on ia64, ppc64 and\n+parisc64 function pointers are indirect and, in fact, are function\n+descriptors, which require additional dereferencing before we can lookup\n+the symbol. As of now, ``S`` and ``s`` perform dereferencing on those\n+platforms (when needed), so ``F`` and ``f`` exist for compatibility\n+reasons only.\n\n\t-ss","headers":{"Return-Path":"","X-Original-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xyWnL0bDRz9t43\n\tfor ;\n\tThu, 21 Sep 2017 19:40:38 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xyWnK6FB2zDsMK\n\tfor ;\n\tThu, 21 Sep 2017 19:40:37 +1000 (AEST)","from mail-pf0-x233.google.com (mail-pf0-x233.google.com\n\t[IPv6:2607:f8b0:400e:c00::233])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xyWkb50l2zDqjC\n\tfor ;\n\tThu, 21 Sep 2017 19:38:15 +1000 (AEST)","by mail-pf0-x233.google.com with SMTP id g65so2953326pfe.13\n\tfor ;\n\tThu, 21 Sep 2017 02:38:15 -0700 (PDT)","from localhost ([175.223.27.85]) by smtp.gmail.com with ESMTPSA id\n\th70sm1847939pfc.115.2017.09.21.02.38.10\n\t(version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);\n\tThu, 21 Sep 2017 02:38:11 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"sCGGAmmq\"; 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