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Howlett" , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Oleg Nesterov , Palmer Dabbelt , Peter Zijlstra , Richard Weinberger , Russell King , Song Liu , Stafford Horne , 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 v2 5/8] ftrace: Add swap_func to ftrace_process_locs() Message-ID: References: <20240826065532.2618273-1-rppt@kernel.org> <20240826065532.2618273-6-rppt@kernel.org> <20240826132909.306b08fc@gandalf.local.home> 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: <20240826132909.306b08fc@gandalf.local.home> On Mon, Aug 26, 2024 at 01:29:09PM -0400, Steven Rostedt wrote: > On Mon, 26 Aug 2024 09:55:29 +0300 > Mike Rapoport wrote: > > > From: Song Liu > > > > ftrace_process_locs sorts module mcount, which is inside RO memory. Add a > > ftrace_swap_func so that archs can use RO-memory-poke function to do the > > sorting. > > Can you add the above as a comment above the ftrace_swap_func() function? Sure. > Thanks, > > -- Steve > > > > > Signed-off-by: Song Liu > > Signed-off-by: Mike Rapoport (Microsoft) > > --- > > include/linux/ftrace.h | 2 ++ > > kernel/trace/ftrace.c | 13 ++++++++++++- > > 2 files changed, 14 insertions(+), 1 deletion(-) > > > > diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h > > index fd5e84d0ec47..b794dcb7cae8 100644 > > --- a/include/linux/ftrace.h > > +++ b/include/linux/ftrace.h > > @@ -1188,4 +1188,6 @@ unsigned long arch_syscall_addr(int nr); > > > > #endif /* CONFIG_FTRACE_SYSCALLS */ > > > > +void ftrace_swap_func(void *a, void *b, int n); > > + > > #endif /* _LINUX_FTRACE_H */ > > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c > > index 4c28dd177ca6..9829979f3a46 100644 > > --- a/kernel/trace/ftrace.c > > +++ b/kernel/trace/ftrace.c > > @@ -6989,6 +6989,17 @@ static void test_is_sorted(unsigned long *start, > > unsigned long count) } > > #endif > > > > +void __weak ftrace_swap_func(void *a, void *b, int n) > > +{ > > + unsigned long t; > > + > > + WARN_ON_ONCE(n != sizeof(t)); > > + > > + t = *((unsigned long *)a); > > + *(unsigned long *)a = *(unsigned long *)b; > > + *(unsigned long *)b = t; > > +} > > + > > static int ftrace_process_locs(struct module *mod, > > unsigned long *start, > > unsigned long *end) > > @@ -7016,7 +7027,7 @@ static int ftrace_process_locs(struct module *mod, > > */ > > if (!IS_ENABLED(CONFIG_BUILDTIME_MCOUNT_SORT) || mod) { > > sort(start, count, sizeof(*start), > > - ftrace_cmp_ips, NULL); > > + ftrace_cmp_ips, ftrace_swap_func); > > } else { > > test_is_sorted(start, count); > > } > -- Sincerely yours, Mike.