From patchwork Sun May 5 14:25:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13654288 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 A283337707; Sun, 5 May 2024 14:28:58 +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=1714919338; cv=none; b=Cs0qJ4ePr71WTmCQDDXEu9pD0y5+2+QSw1qvi4O9EoIemlBdPSCOj6OoA1UH7ds+zlB6keyLmtEM7ZS/cCWXmfPUegW10jcPrW+WNlAHNZIqXzQQ29/A25BVFm8rxmvibRG4cMFGg5MtRtTmloWNMB9/BQdi4PYG+XbLRQw7ZHA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714919338; c=relaxed/simple; bh=IjQRyjekukMjpd5h0+fXfebHcomYxPC0ei8vi/yCB1s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tfNYsxdL7lixXNU0gqy36+vgm664UWiphGSfdFK7CRquMCXdMpfGZ+VK2aNJtw+5nzNr92VmkLGju6r2q1+obRWvyD6HGq+cl2mrQYa2G8IgFqvoQtQxBYgXw+Ix2Ki9E+n28oH3QyNGgmPSYT1m4CX83UdDI33iyzQGwlb/9dI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cuVFtupf; 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="cuVFtupf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B27BEC4DDE7; Sun, 5 May 2024 14:28:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714919338; bh=IjQRyjekukMjpd5h0+fXfebHcomYxPC0ei8vi/yCB1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cuVFtupflLG9foxMymnTpolKk/M8bZjmlvoz/5eAdj/Z7jQ3VoLWttmwQjjfF7k6F gVRucLz5J7TjB0oz3lKSXF/Qfgn4YfiKtiBaspHSER9pRgodxhwQaBwBBlZJXEAbx3 itoCIx+2aKqrcMnxllqD/Xqq15d6gfl6nRuhpfksLTuLH3EHuWQluNRdW0IvqIbrxN zgi4oer7nSTtlhcycRpg75sJg7UMeotCvpnVKznt18uUIrjjgHbOqf1KjIF6aonw37 +sBXk1tkpAP2cobOwC0+bu9JCS4gou7ZT1EdLfDoRt1l+1jvKZ4OXqqsn3wKoXCOZa 26OgeAK2La2gg== 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 , Liviu Dudau , 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 v8 13/17] x86/ftrace: enable dynamic ftrace without CONFIG_MODULES Date: Sun, 5 May 2024 17:25:56 +0300 Message-ID: <20240505142600.2322517-14-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240505142600.2322517-1-rppt@kernel.org> References: <20240505142600.2322517-1-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) Reviewed-by: Steven Rostedt (Google) --- 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);