| Message ID | 20230616085038.4121892-12-rppt@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm: jit/text allocator | expand |
On Fri, Jun 16, 2023 at 1:52 AM 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> Acked-by: Song Liu <song@kernel.org> > --- > 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 53bab123a8ee..ab64bbef9e50 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -35,6 +35,7 @@ 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 f77c63bb3203..a824a5d3b129 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_text_alloc(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); > -- > 2.35.1 >
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 53bab123a8ee..ab64bbef9e50 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -35,6 +35,7 @@ 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 f77c63bb3203..a824a5d3b129 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_text_alloc(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);