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Howlett" , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Oleg Nesterov , Palmer Dabbelt , Richard Weinberger , Russell King , Song Liu , Stafford Horne , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Uladzislau Rezki , Vineet Gupta , Will Deacon , bpf@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-trace-kernel@vger.kernel.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v3 6/8] x86/module: perpare module loading for ROX allocations of text Message-ID: References: <20240909064730.3290724-1-rppt@kernel.org> <20240909064730.3290724-7-rppt@kernel.org> <20240909092923.GB4723@noisy.programming.kicks-ass.net> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240909092923.GB4723@noisy.programming.kicks-ass.net> On Mon, Sep 09, 2024 at 11:29:23AM +0200, Peter Zijlstra wrote: > On Mon, Sep 09, 2024 at 09:47:28AM +0300, Mike Rapoport wrote: > > diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c > > index 8da0e66ca22d..563d9a890ce2 100644 > > --- a/arch/x86/kernel/ftrace.c > > +++ b/arch/x86/kernel/ftrace.c > > > @@ -654,4 +656,15 @@ void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, > > } > > #endif > > > > +void ftrace_swap_func(void *a, void *b, int n) > > +{ > > + unsigned long t; > > + > > + WARN_ON_ONCE(n != sizeof(t)); > > + > > + t = *((unsigned long *)a); > > + text_poke_copy(a, b, sizeof(t)); > > + text_poke_copy(b, &t, sizeof(t)); > > +} > > This is insane, just force BUILDTIME_MCOUNT_SORT The comment in ftrace.c says "... while mcount loc in modules can not be sorted at build time" I don't know enough about objtool, but I'd presume it's because the sorting should happen after relocations, no? -- Sincerely yours, Mike.