From patchwork Mon Apr 22 09:44:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13638214 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 D02F613CA90; Mon, 22 Apr 2024 09:47:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713779239; cv=none; b=EAcRb5Q0M+7VpMWkslBOmVM5is7Cj4W1AG730d3YAraCZwq/PTFEmfhZmX56w3lUAzTs9pqEvrmwiVtK8O6cidyrIu7ujDyJz02AO/AM4iLcYV7G/bryOV+5NxmCo5jAu6BD5NjnniUL5lhTPtYmxjy0gXaKp64Dk6nb2+k5MVI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713779239; c=relaxed/simple; bh=lHpN+d0QRuUVXJIB1eReja4FWUfXvpd+hME9aJI8tNM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZKW378opubK7itpYu763YvYIoJY5k4TeGdqyYQDhyBrSoFyNOB4uH9ETewfsFPFt/Zg8lRx9nx8x8Vd9+o4Le/EwD+wJnn1i7j1xxdDbW8yZ4b1sbfMlNPPeelto/QgpppQzg3pn4oRV8WI9GC/MLp4JIar4rzOvUux7QyBFHj8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lqvQCRbS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lqvQCRbS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C049C4AF07; Mon, 22 Apr 2024 09:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713779238; bh=lHpN+d0QRuUVXJIB1eReja4FWUfXvpd+hME9aJI8tNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lqvQCRbSgOtByDX5V7X7Bw0Q6Xg/6rK2dK+e7xdmVuh3CxXahd5fkRnnV4/E1mgFv MnpJiS6k7qsv4Cv9yrxpVrkgPtBTgXqv6snY5o+VvaMzmB+dgrrgTWs6Fk2xCb4cbk clpfBZgcTEXi+sDhCAuvAiBk/RZJQ1ExQR6SIQ0XaYWNYv8ggZmdP6DnkyauN/SN5i PgKK3IY72GlYAysRAMEAsjNSAyfQ8xL5gQVlm2N6nJvIJ2embrZ+O9iEk9WZVsoBfo Jyo9Tu1EKGZ/sy2vEM8dORmBr0c+/aSvnlpUXttLCMWeOso2IBKsjBwFUVDAnUIytk rvIzl/f//U9QA== 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 , 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 v5 12/15] x86/ftrace: enable dynamic ftrace without CONFIG_MODULES Date: Mon, 22 Apr 2024 12:44:33 +0300 Message-ID: <20240422094436.3625171-13-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240422094436.3625171-1-rppt@kernel.org> References: <20240422094436.3625171-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@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) --- 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 3f5ba72c9480..cd8addb96a0b 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);