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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=b5rCnYz4obhAgpKHq4mgEn5Hvv5UPGIbAlGkTv5aKg4=; b=qaNcNgF6Mlv5B9ewcNGs49BGmK51/bT8r+OYFEoXqWKKJ8mPukbob2Ha1yySl65SpS z2smRlPHF+Qi/l+WzNtTAGPpOTRKcMOxdP7O4sKQMlhdEuSCPtkAuZs65ZEZax80C6GU 19nPutZ5sdRZSIjA01+wosyMoZP/VZUwm5FHaZqifMj6Wl7lXxXcZlmCcwpeqHWlRlQs 20Kw0hjJSvGqjlPwS8Qenv/Y/5DT3hC4YojeUpISex7CDDf8nFPU2kErN8JVXDIKXLrW 8uJ4QcIoaHGFNCMLenwp9E51D0VzQfSe5yvlSXG/h2am11C7vFKPkRq1pG10McHzCNSM 7VJw== X-Gm-Message-State: AOAM533ucvDb8t6ol4a7nAkuMBU1v8pyRCB94w7l6rvNYoc6QF1tp8P+ UXI92/t5iH+db3iXdzWmL7CK06y/qzRLlIO+B7g= X-Google-Smtp-Source: ABdhPJxUsLNRYd2SDtvgB7CmXqlcp3vGOaCoLMxBFjkUgYB81ry88e1Q7zWE2vdzY9Ol+dTKaZMDIAjVS73Q6wHF4BA= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:122a:: with SMTP id p10mr14125090qvv.0.1602260054668; Fri, 09 Oct 2020 09:14:14 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:26 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-18-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 17/29] PCI: Fix PREL32 relocations for LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201009_121418_736243_640B74C1 X-CRM114-Status: GOOD ( 12.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org With Clang's Link Time Optimization (LTO), the compiler can rename static functions to avoid global naming collisions. As PCI fixup functions are typically static, renaming can break references to them in inline assembly. This change adds a global stub to DECLARE_PCI_FIXUP_SECTION to fix the issue when PREL32 relocations are used. Signed-off-by: Sami Tolvanen Acked-by: Bjorn Helgaas Reviewed-by: Kees Cook --- include/linux/pci.h | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/include/linux/pci.h b/include/linux/pci.h index 835530605c0d..4e64421981c7 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1909,19 +1909,28 @@ enum pci_fixup_pass { }; #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS -#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ - class_shift, hook) \ - __ADDRESSABLE(hook) \ +#define ___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ + class_shift, hook, stub) \ + void stub(struct pci_dev *dev); \ + void stub(struct pci_dev *dev) \ + { \ + hook(dev); \ + } \ asm(".section " #sec ", \"a\" \n" \ ".balign 16 \n" \ ".short " #vendor ", " #device " \n" \ ".long " #class ", " #class_shift " \n" \ - ".long " #hook " - . \n" \ + ".long " #stub " - . \n" \ ".previous \n"); + +#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ + class_shift, hook, stub) \ + ___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ + class_shift, hook, stub) #define DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ class_shift, hook) \ __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ - class_shift, hook) + class_shift, hook, __UNIQUE_ID(hook)) #else /* Anonymous variables would be nice... */ #define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class, \ -- 2.28.0.1011.ga647a8990f-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel