From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B19DAC43217 for ; Fri, 27 May 2022 16:39:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235357AbiE0Qjh (ORCPT ); Fri, 27 May 2022 12:39:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353977AbiE0Qjf (ORCPT ); Fri, 27 May 2022 12:39:35 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A12F2C5DB6; Fri, 27 May 2022 09:39:32 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2680A61DFD; Fri, 27 May 2022 16:39:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7CEAEC385B8; Fri, 27 May 2022 16:39:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1653669571; bh=EPJ6GgdKvvTTzpkQb91Vq58296dVXW14JjlSK1mMYRE=; h=Date:To:From:Subject:From; b=pGvDF4Tldfbwj4fh+ni3w6FwxD6ATizhkduOFh70N0hp6qOL95sCieMKhq8dYtDDn nHyCGUmgYb8SAvMgupjf6hStu7vdmRcpSkdR0uTNehZ5WLNSbuLHNe8m3JtCY12CDF Ou5pe3eJLb24ST7Dqy0Ecz4W9BLhcYfMSIB9ZYwo= Date: Fri, 27 May 2022 09:39:30 -0700 To: mm-commits@vger.kernel.org, stable@vger.kernel.org, mpe@ellerman.id.au, ebiederm@xmission.com, naveen.n.rao@linux.vnet.ibm.com, akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-hotfixes-stable] kexec_file-drop-weak-attribute-from-arch_kexec_apply_relocations.patch removed from -mm tree Message-Id: <20220527163931.7CEAEC385B8@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The quilt patch titled Subject: kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add] has been removed from the -mm tree. Its filename was kexec_file-drop-weak-attribute-from-arch_kexec_apply_relocations.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: "Naveen N. Rao" Subject: kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add] Date: Thu, 19 May 2022 14:42:37 +0530 Since commit d1bcae833b32f1 ("ELF: Don't generate unused section symbols") [1], binutils (v2.36+) started dropping section symbols that it thought were unused. This isn't an issue in general, but with kexec_file.c, gcc is placing kexec_arch_apply_relocations[_add] into a separate .text.unlikely section and the section symbol ".text.unlikely" is being dropped. Due to this, recordmcount is unable to find a non-weak symbol in .text.unlikely to generate a relocation record against. Address this by dropping the weak attribute from these functions. Instead, follow the existing pattern of having architectures #define the name of the function they want to override in their headers. [1] https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d1bcae833b32f1 [akpm@linux-foundation.org: arch/s390/include/asm/kexec.h needs linux/module.h] Link: https://lkml.kernel.org/r/20220519091237.676736-1-naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Michael Ellerman Signed-off-by: Naveen N. Rao Cc: "Eric W. Biederman" Cc: Signed-off-by: Andrew Morton --- arch/s390/include/asm/kexec.h | 10 ++++++ arch/x86/include/asm/kexec.h | 8 +++++ include/linux/kexec.h | 46 ++++++++++++++++++++++++++------ kernel/kexec_file.c | 34 ----------------------- 4 files changed, 56 insertions(+), 42 deletions(-) --- a/arch/s390/include/asm/kexec.h~kexec_file-drop-weak-attribute-from-arch_kexec_apply_relocations +++ a/arch/s390/include/asm/kexec.h @@ -9,6 +9,8 @@ #ifndef _S390_KEXEC_H #define _S390_KEXEC_H +#include + #include #include #include @@ -83,4 +85,12 @@ struct kimage_arch { extern const struct kexec_file_ops s390_kexec_image_ops; extern const struct kexec_file_ops s390_kexec_elf_ops; +#ifdef CONFIG_KEXEC_FILE +struct purgatory_info; +int arch_kexec_apply_relocations_add(struct purgatory_info *pi, + Elf_Shdr *section, + const Elf_Shdr *relsec, + const Elf_Shdr *symtab); +#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add +#endif #endif /*_S390_KEXEC_H */ --- a/arch/x86/include/asm/kexec.h~kexec_file-drop-weak-attribute-from-arch_kexec_apply_relocations +++ a/arch/x86/include/asm/kexec.h @@ -186,6 +186,14 @@ extern int arch_kexec_post_alloc_pages(v extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages); #define arch_kexec_pre_free_pages arch_kexec_pre_free_pages +#ifdef CONFIG_KEXEC_FILE +struct purgatory_info; +int arch_kexec_apply_relocations_add(struct purgatory_info *pi, + Elf_Shdr *section, + const Elf_Shdr *relsec, + const Elf_Shdr *symtab); +#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add +#endif #endif typedef void crash_vmclear_fn(void); --- a/include/linux/kexec.h~kexec_file-drop-weak-attribute-from-arch_kexec_apply_relocations +++ a/include/linux/kexec.h @@ -193,14 +193,6 @@ void *kexec_purgatory_get_symbol_addr(st int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len); void *arch_kexec_kernel_image_load(struct kimage *image); -int arch_kexec_apply_relocations_add(struct purgatory_info *pi, - Elf_Shdr *section, - const Elf_Shdr *relsec, - const Elf_Shdr *symtab); -int arch_kexec_apply_relocations(struct purgatory_info *pi, - Elf_Shdr *section, - const Elf_Shdr *relsec, - const Elf_Shdr *symtab); int arch_kimage_file_post_load_cleanup(struct kimage *image); #ifdef CONFIG_KEXEC_SIG int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, @@ -229,6 +221,44 @@ extern int crash_exclude_mem_range(struc unsigned long long mend); extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, void **addr, unsigned long *sz); + +#ifndef arch_kexec_apply_relocations_add +/* + * arch_kexec_apply_relocations_add - apply relocations of type RELA + * @pi: Purgatory to be relocated. + * @section: Section relocations applying to. + * @relsec: Section containing RELAs. + * @symtab: Corresponding symtab. + * + * Return: 0 on success, negative errno on error. + */ +static inline int +arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section, + const Elf_Shdr *relsec, const Elf_Shdr *symtab) +{ + pr_err("RELA relocation unsupported.\n"); + return -ENOEXEC; +} +#endif + +#ifndef arch_kexec_apply_relocations +/* + * arch_kexec_apply_relocations - apply relocations of type REL + * @pi: Purgatory to be relocated. + * @section: Section relocations applying to. + * @relsec: Section containing RELs. + * @symtab: Corresponding symtab. + * + * Return: 0 on success, negative errno on error. + */ +static inline int +arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section, + const Elf_Shdr *relsec, const Elf_Shdr *symtab) +{ + pr_err("REL relocation unsupported.\n"); + return -ENOEXEC; +} +#endif #endif /* CONFIG_KEXEC_FILE */ #ifdef CONFIG_KEXEC_ELF --- a/kernel/kexec_file.c~kexec_file-drop-weak-attribute-from-arch_kexec_apply_relocations +++ a/kernel/kexec_file.c @@ -109,40 +109,6 @@ int __weak arch_kexec_kernel_verify_sig( #endif /* - * arch_kexec_apply_relocations_add - apply relocations of type RELA - * @pi: Purgatory to be relocated. - * @section: Section relocations applying to. - * @relsec: Section containing RELAs. - * @symtab: Corresponding symtab. - * - * Return: 0 on success, negative errno on error. - */ -int __weak -arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section, - const Elf_Shdr *relsec, const Elf_Shdr *symtab) -{ - pr_err("RELA relocation unsupported.\n"); - return -ENOEXEC; -} - -/* - * arch_kexec_apply_relocations - apply relocations of type REL - * @pi: Purgatory to be relocated. - * @section: Section relocations applying to. - * @relsec: Section containing RELs. - * @symtab: Corresponding symtab. - * - * Return: 0 on success, negative errno on error. - */ -int __weak -arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section, - const Elf_Shdr *relsec, const Elf_Shdr *symtab) -{ - pr_err("REL relocation unsupported.\n"); - return -ENOEXEC; -} - -/* * Free up memory used by kernel, initrd, and command line. This is temporary * memory allocation which is not needed any more after these buffers have * been loaded into separate segments and have been copied elsewhere. _ Patches currently in -mm which might be from naveen.n.rao@linux.vnet.ibm.com are