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Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , 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: Re: [PATCH v4 05/15] mm: introduce execmem_alloc() and execmem_free() Message-ID: <20240415075241.GF40213@noisy.programming.kicks-ass.net> References: <20240411160051.2093261-1-rppt@kernel.org> <20240411160051.2093261-6-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240411160051.2093261-6-rppt@kernel.org> X-Rspamd-Queue-Id: 88ABD100013 X-Rspam-User: X-Stat-Signature: rd9prak36wj3t3h7gbtptq1e15erczds X-Rspamd-Server: rspam01 X-HE-Tag: 1713167595-170449 X-HE-Meta: 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 paQivOu+ S9n+fVy8UhrqQW+hiLndlzo4SycWPkphku1n+Dp6KbIDBKwpigbsLwMXh3cx73y2S8Ljz3npP1Kgjr5gzHEpKZrbKa3KNUU7M+CwBt5MR2t2flFkMooCPG6bS8R8WtPdedcw6VE5auRQ7pwJeWDdWiVHYHhBIViec5pVwNXduMcKEU4k5B/r/AmQiE41s8nsp7mrHJN4AbXegITCBcGzHcH81evBbjwNQxjdqUDXUkynOvIvMl+4bW7v+i/pebQ6/RtI8 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 11, 2024 at 07:00:41PM +0300, Mike Rapoport wrote: > +/** > + * enum execmem_type - types of executable memory ranges > + * > + * There are several subsystems that allocate executable memory. > + * Architectures define different restrictions on placement, > + * permissions, alignment and other parameters for memory that can be used > + * by these subsystems. > + * Types in this enum identify subsystems that allocate executable memory > + * and let architectures define parameters for ranges suitable for > + * allocations by each subsystem. > + * > + * @EXECMEM_DEFAULT: default parameters that would be used for types that > + * are not explcitly defined. > + * @EXECMEM_MODULE_TEXT: parameters for module text sections > + * @EXECMEM_KPROBES: parameters for kprobes > + * @EXECMEM_FTRACE: parameters for ftrace > + * @EXECMEM_BPF: parameters for BPF > + * @EXECMEM_TYPE_MAX: > + */ > +enum execmem_type { > + EXECMEM_DEFAULT, > + EXECMEM_MODULE_TEXT = EXECMEM_DEFAULT, > + EXECMEM_KPROBES, > + EXECMEM_FTRACE, > + EXECMEM_BPF, > + EXECMEM_TYPE_MAX, > +}; Can we please get a break-down of how all these types are actually different from one another? I'm thinking some platforms have a tiny immediate space (arm64 comes to mind) and has less strict placement constraints for some of them?