From patchwork Fri Jun 16 08:50:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13282230 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 041F6D527; Fri, 16 Jun 2023 08:52:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63411C433CD; Fri, 16 Jun 2023 08:52:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686905566; bh=AxRcB1rbG7MX4ajPnkYNEbWMZh1yl4AN5nTT9Qz7DHU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZchgUMnnGJtygAK+raIh8zX9M61bZysDceEU+itjtebjtydTZ0C8fH1hI5bi4yGBb 0+mHlJlsA3sTSWJjXOVsf+IFNO63l+46LQ4D8pW+jkx2afKib/rMkLoAvh4O974KxA QCl4Bqu8K2hxeNPu/cB6HvnMBzBbnvOHtf3y2YLFQGcwRgm1+P0WIvE/z5ZbUIw91u ba1rD6V2jMggpxQpwYe/sAWEddvOz0cJmvshYC2bRpQgDYIvsL6oUpJnQkOfJkKIux i+LFm6hoyQ9aaY4Ey4iQt1b/bqoxupbOQ2/L2miYy/B9MD5ckQj1/ij4pRHCf3zadw X6rUYOmGj4t1Q== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , 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 v2 11/12] x86/ftrace: enable dynamic ftrace without CONFIG_MODULES Date: Fri, 16 Jun 2023 11:50:37 +0300 Message-Id: <20230616085038.4121892-12-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230616085038.4121892-1-rppt@kernel.org> References: <20230616085038.4121892-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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) Acked-by: Song Liu --- 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 53bab123a8ee..ab64bbef9e50 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 f77c63bb3203..a824a5d3b129 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(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);