From patchwork Mon Sep 18 07:29:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13389037 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 958B0C46CA1 for ; Mon, 18 Sep 2023 07:32:40 +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=kmRl+Ispcfaal/6f9UKb4Tx4XefxHvQZ/I9c1wgMT2o=; b=CqWJup6GE1JVW1 0WYznDOiuqt7EDRkQOO2bwFt4ZX8UEOAcILhRFS+rulw0NkmXFnT08JSeplkkSCldBuX1vrsmeNXa jKIJTqg+MAClwFoBXF6GohuxgezTCNYT0ZoWikU3++RtXTEb0xDzYTqTr+sBX3M8rdauohhm+WCSG Bk2v1AskqeMllGjaCoIQqgNJyBnT2DtFW7OM4FC1ZQoVbkQOVt1HSVu4418XWhKEwdQh3Bt59cUzn l5oiStP/ib6krVE6kVtluNCoatLULn4mHwMbFxAUZ4uAIvE0kQC5ndyR2GpOhhDUEPHJZxNPJCRX8 RmoxAEUE7Wy3p6OquxiA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qi8jp-00EiNj-1x; Mon, 18 Sep 2023 07:32:09 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qi8ji-00EiGv-39; Mon, 18 Sep 2023 07:32:05 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6804C60FA1; Mon, 18 Sep 2023 07:32:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE792C433BC; Mon, 18 Sep 2023 07:31:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695022322; bh=1UL8tl9eANdNOFG3ZTSYgBTww7VCSn8pNWCEuJfnTK4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jOnWnURBWcrt92iQ1E5Vr3mXWyQ6RAJ4i9B8tsY7FXOUVwWaNtFLbRVsEzVfJ0Nfg zcF2T76bilI3SPkaUjpMzEfs1sQN/JzTRMR83DnXh+Ov+MJ2AuKwZwF8Fnu/AObC0k QAdcrio7/1JZevOAFEj9aMF9cUGQUD6UCX9K1G2jVF2I2HWuIYbnj0wy/Rm4EXVNom HeAH3TaXGuMZDe4Y3BnUwv/DnuIZbNW8G+v45crhACvScxYPJb49nAjf6MNnqIIZFe chFFMgGweSzKG7hh/3g3keI9zbSw1HmwgbPcUexA3rwgKV2tInhKeo5IsMuopaavQ2 VqOvvHTW8VtZw== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , =?utf-8?b?QmrDtnJuIFTDtnBl?= =?utf-8?b?bA==?= , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Michael Ellerman , Mike Rapoport , Nadav Amit , "Naveen N. Rao" , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@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 v3 11/13] x86/ftrace: enable dynamic ftrace without CONFIG_MODULES Date: Mon, 18 Sep 2023 10:29:53 +0300 Message-Id: <20230918072955.2507221-12-rppt@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230918072955.2507221-1-rppt@kernel.org> References: <20230918072955.2507221-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230918_003203_130281_8082FB7B X-CRM114-Status: GOOD ( 13.59 ) 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 982b777eadc7..cc7c4a0a8c16 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -35,6 +35,7 @@ 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 ae56d79a6a74..7ed7e8297ba3 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_text_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);