| Message ID | 20240505142600.2322517-14-rppt@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm: jit/text allocator | expand |
On Sun, 5 May 2024 17:25:56 +0300 Mike Rapoport <rppt@kernel.org> wrote: > From: "Mike Rapoport (IBM)" <rppt@kernel.org> > > 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) <rppt@kernel.org> > --- > arch/x86/Kconfig | 1 + > arch/x86/kernel/ftrace.c | 10 ---------- > 2 files changed, 1 insertion(+), 10 deletions(-) Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> -- Steve
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);