From patchwork Mon Apr 29 12:16:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13646851 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D4C10C04FFE for ; Mon, 29 Apr 2024 12:21:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=soTKBGSQwDkv8tEOPTfNZ4f1DBJoDGrjWG5h8WInwFA=; b=W7vl1MXaIIhV+6 Vv7excEW9+SwtCpp2J2r5aTH+AuE/0rfFGePMOXY+tnLn+m1cqP++frupR01k0isSUN6ShKjc/GjU MLErmIDMR9iljPvl3cgLJi2m4bJTF0WgQKDsQF01XRXa2kEqRMcjwpUWGheolTZrRHc2JgbNTbhNK gL2iEWExbzqd1n9rL9t+nW7oCHlvOC4RcJxJ8cmgKqoVzwLbPXmaRcKaQO2MHZwi253v6iU1iQfc7 IE5/eVyVxca4PsRVuDlJPiEmsYoYy4JQCmZ7inOzQmScXy8K291hrPmpvoNnPXTUcF9qkRePPj3p3 j6LS0wgx+LS5v7rIVOsg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s1Pzx-00000002h3w-1fKm; Mon, 29 Apr 2024 12:20:45 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s1PyW-00000002g8e-3tbV; Mon, 29 Apr 2024 12:19:16 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=bP6HuoUMXi9ivDdJhuywQ3Y30eb1dSG7Z8hyYP5sWNc=; b=SRLMPJDhJnu0lpT6QXRIBSS8H6 f52I2U4VbxUdGMDUqqgHl2l9DD/m6W9EBR69S00ENbPATlVBCxVemOnPl9BDVctlFXWbjZrXIOdxq Zp5ITC66+8GtV3xw35kw3qi5NFOelNppkOxXyLZ9vLUDE7FO0e3VvOH+uDFVNWUA80nmY8iOnaa1c TJOGL7tpxAL7dmvbV7ZBQ5nOXarBbIouCMcJ7eBkZkBJo1Ca1kRSyFLeHYYjjpzv1OQFjf7iy1cV/ CScCnzd0Md0nDtVYAtoJE9DlZan03Oir5gZ8av+wUCG+Q67tGmKaxeCUV2KKuSAWhTvfTwYoEXxDM 9frav/vA==; Received: from sin.source.kernel.org ([145.40.73.55]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s1PyR-0000000GUiz-1d95; Mon, 29 Apr 2024 12:19:15 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 596BDCE0B62; Mon, 29 Apr 2024 12:19:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6B74C4AF51; Mon, 29 Apr 2024 12:18:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714393146; bh=IjQRyjekukMjpd5h0+fXfebHcomYxPC0ei8vi/yCB1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SPgdaeYpabv0yHFmtuafEHgxX9ZhBEqjRbAHz/5OrYvplh1qL2PD46cmSJh5suetN MkVsDxw/Td7Y1re0PavY5BxsYWOYTVZ0toQRjMjgfi7wJUrE/gCo65MYq9y2mAmpuA dN1l/5M0x7M6kCdxTVfIdYgmZwlVZOFC2YnDZ6ehAMmmVizJWt+EyHyMrGsVUN5Mg2 RChPQ3gUYMGrhlVhXxe/Xqs3QcR5pvQ58YzMpD6UiLTiYy1Edv1UnecuUBwzl1Q0EA Pf9ONvjqTVc5Y9+LcfGa4WNrm/awTw0lvt7VBnXpkuN+acRAs394j6dfq2cKDLhnUf vkdtS4dR7I3og== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Alexandre Ghiti , Andrew Morton , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Michael Ellerman , Mike Rapoport , Nadav Amit , Palmer Dabbelt , Peter Zijlstra , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Rick Edgecombe , Russell King , Sam Ravnborg , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v7 13/16] x86/ftrace: enable dynamic ftrace without CONFIG_MODULES Date: Mon, 29 Apr 2024 15:16:17 +0300 Message-ID: <20240429121620.1186447-14-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240429121620.1186447-1-rppt@kernel.org> References: <20240429121620.1186447-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240429_131912_625305_6D066C7E X-CRM114-Status: GOOD ( 12.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Mike Rapoport (IBM)" Dynamic ftrace must allocate memory for code and this was impossible without CONFIG_MODULES. With execmem separated from the modules code, execmem_text_alloc() is available regardless of CONFIG_MODULES. Remove dependency of dynamic ftrace on CONFIG_MODULES and make CONFIG_DYNAMIC_FTRACE select CONFIG_EXECMEM in Kconfig. Signed-off-by: Mike Rapoport (IBM) --- arch/x86/Kconfig | 1 + arch/x86/kernel/ftrace.c | 10 ---------- 2 files changed, 1 insertion(+), 10 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4474bf32d0a4..f2917ccf4fb4 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -34,6 +34,7 @@ config X86_64 select SWIOTLB select ARCH_HAS_ELFCORE_COMPAT select ZONE_DMA32 + select EXECMEM if DYNAMIC_FTRACE config FORCE_DYNAMIC_FTRACE def_bool y diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index c8ddb7abda7c..8da0e66ca22d 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -261,8 +261,6 @@ void arch_ftrace_update_code(int command) /* Currently only x86_64 supports dynamic trampolines */ #ifdef CONFIG_X86_64 -#ifdef CONFIG_MODULES -/* Module allocation simplifies allocating memory for code */ static inline void *alloc_tramp(unsigned long size) { return execmem_alloc(EXECMEM_FTRACE, size); @@ -271,14 +269,6 @@ static inline void tramp_free(void *tramp) { execmem_free(tramp); } -#else -/* Trampolines can only be created if modules are supported */ -static inline void *alloc_tramp(unsigned long size) -{ - return NULL; -} -static inline void tramp_free(void *tramp) { } -#endif /* Defined as markers to the end of the ftrace default trampolines */ extern void ftrace_regs_caller_end(void);