From 140c8180eb7c7cbda399f64474788b86db72db32 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Sun, 24 May 2020 23:34:20 +0200 Subject: [PATCH] arch: remove HAVE_COPY_THREAD_TLS All architectures support copy_thread_tls() now, so remove the legacy copy_thread() function and the HAVE_COPY_THREAD_TLS config option. Everyone uses the same process creation calling convention based on copy_thread_tls() and struct kernel_clone_args. This will make it easier to maintain the core process creation code under kernel/, simplifies the callpaths and makes the identical for all architectures. Cc: linux-arch@vger.kernel.org Acked-by: Thomas Bogendoerfer Acked-by: Greentime Hu Acked-by: Geert Uytterhoeven Reviewed-by: Kees Cook Signed-off-by: Christian Brauner --- arch/Kconfig | 7 ------- arch/alpha/Kconfig | 1 - arch/arc/Kconfig | 1 - arch/arm/Kconfig | 1 - arch/arm64/Kconfig | 1 - arch/c6x/Kconfig | 1 - arch/csky/Kconfig | 1 - arch/h8300/Kconfig | 1 - arch/hexagon/Kconfig | 1 - arch/ia64/Kconfig | 1 - arch/m68k/Kconfig | 1 - arch/microblaze/Kconfig | 1 - arch/mips/Kconfig | 1 - arch/nds32/Kconfig | 1 - arch/nios2/Kconfig | 1 - arch/openrisc/Kconfig | 1 - arch/parisc/Kconfig | 1 - arch/powerpc/Kconfig | 1 - arch/riscv/Kconfig | 1 - arch/s390/Kconfig | 1 - arch/sh/Kconfig | 1 - arch/sparc/Kconfig | 1 - arch/um/Kconfig | 1 - arch/unicore32/Kconfig | 1 - arch/x86/Kconfig | 1 - arch/xtensa/Kconfig | 1 - include/linux/sched/task.h | 15 +-------------- kernel/fork.c | 9 --------- 28 files changed, 1 insertion(+), 55 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 8cc35dc556c7..943aac2f3ebe 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -754,13 +754,6 @@ config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT depends on MMU select ARCH_HAS_ELF_RANDOMIZE -config HAVE_COPY_THREAD_TLS - bool - help - Architecture provides copy_thread_tls to accept tls argument via - normal C parameter passing, rather than extracting the syscall - argument from pt_regs. - config HAVE_STACK_VALIDATION bool help diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index b01515c6b2ed..10862c5a8c76 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -38,7 +38,6 @@ config ALPHA select OLD_SIGSUSPEND select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67 select MMU_GATHER_NO_RANGE - select HAVE_COPY_THREAD_TLS help The Alpha is a 64-bit general-purpose processor designed and marketed by the Digital Equipment Corporation of blessed memory, diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index fddc70029727..1fa0b98ed9ce 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -29,7 +29,6 @@ config ARC select GENERIC_SMP_IDLE_THREAD select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK - select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_STACKOVERFLOW select HAVE_DEBUG_KMEMLEAK select HAVE_FUTEX_CMPXCHG if FUTEX diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 2ac74904a3ce..445b5ed693f0 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -72,7 +72,6 @@ config ARM select HAVE_ARM_SMCCC if CPU_V7 select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32 select HAVE_CONTEXT_TRACKING - select HAVE_COPY_THREAD_TLS select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_KMEMLEAK if !XIP_KERNEL select HAVE_DMA_CONTIGUOUS if MMU diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a4a094bedcb2..de93e965727d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -148,7 +148,6 @@ config ARM64 select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL select HAVE_CONTEXT_TRACKING - select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_BUGVERBOSE select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig index 9cde76a5928e..6444ebfd06a6 100644 --- a/arch/c6x/Kconfig +++ b/arch/c6x/Kconfig @@ -22,7 +22,6 @@ config C6X select GENERIC_CLOCKEVENTS select MODULES_USE_ELF_RELA select MMU_GATHER_NO_RANGE if MMU - select HAVE_COPY_THREAD_TLS config MMU def_bool n diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index bd31ab12f77d..902f1142d550 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -38,7 +38,6 @@ config CSKY select GX6605S_TIMER if CPU_CK610 select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_AUDITSYSCALL - select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_BUGVERBOSE select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig index de0eb417a0b9..d11666d538fe 100644 --- a/arch/h8300/Kconfig +++ b/arch/h8300/Kconfig @@ -26,7 +26,6 @@ config H8300 select HAVE_ARCH_HASH select CPU_NO_EFFICIENT_FFS select UACCESS_MEMCPY - select HAVE_COPY_THREAD_TLS config CPU_BIG_ENDIAN def_bool y diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig index 19bc2f2ee331..667cfc511cf9 100644 --- a/arch/hexagon/Kconfig +++ b/arch/hexagon/Kconfig @@ -31,7 +31,6 @@ config HEXAGON select GENERIC_CLOCKEVENTS_BROADCAST select MODULES_USE_ELF_RELA select GENERIC_CPU_DEVICES - select HAVE_COPY_THREAD_TLS help Qualcomm Hexagon is a processor architecture designed for high performance and low power across a wide variety of applications. diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 1b6034b89a04..1fa2fe2ef053 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -55,7 +55,6 @@ config IA64 select HAVE_ARCH_AUDITSYSCALL select NEED_DMA_MAP_STATE select NEED_SG_DMA_LENGTH - select HAVE_COPY_THREAD_TLS select NUMA if !FLATMEM default y help diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 6ad6cdac74b3..6663f1741798 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -14,7 +14,6 @@ config M68K select HAVE_AOUT if MMU select HAVE_ASM_MODVERSIONS select HAVE_DEBUG_BUGVERBOSE - select HAVE_COPY_THREAD_TLS select GENERIC_IRQ_SHOW select GENERIC_ATOMIC64 select HAVE_UID16 diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index e3a211a41880..d262ac0c8714 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -46,7 +46,6 @@ config MICROBLAZE select CPU_NO_EFFICIENT_FFS select MMU_GATHER_NO_RANGE if MMU select SPARSE_IRQ - select HAVE_COPY_THREAD_TLS # Endianness selection choice diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 6fee1a133e9d..ca92c3ed2dc5 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -51,7 +51,6 @@ config MIPS select HAVE_CBPF_JIT if !64BIT && !CPU_MICROMIPS select HAVE_CONTEXT_TRACKING select HAVE_TIF_NOHZ - select HAVE_COPY_THREAD_TLS select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_STACKOVERFLOW diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig index 7b6eaca81cce..e30298e99e1b 100644 --- a/arch/nds32/Kconfig +++ b/arch/nds32/Kconfig @@ -48,7 +48,6 @@ config NDS32 select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FTRACE_MCOUNT_RECORD select HAVE_DYNAMIC_FTRACE - select HAVE_COPY_THREAD_TLS help Andes(nds32) Linux support. diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig index f9a05957a883..c6645141bb2a 100644 --- a/arch/nios2/Kconfig +++ b/arch/nios2/Kconfig @@ -27,7 +27,6 @@ config NIOS2 select USB_ARCH_HAS_HCD if USB_SUPPORT select CPU_NO_EFFICIENT_FFS select MMU_GATHER_NO_RANGE if MMU - select HAVE_COPY_THREAD_TLS config GENERIC_CSUM def_bool y diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index 8588996165ae..7e94fe37cb2f 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -16,7 +16,6 @@ config OPENRISC select HANDLE_DOMAIN_IRQ select GPIOLIB select HAVE_ARCH_TRACEHOOK - select HAVE_COPY_THREAD_TLS select SPARSE_IRQ select GENERIC_IRQ_CHIP select GENERIC_IRQ_PROBE diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index 8e4c3708773d..2667eeb6c6f1 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -62,7 +62,6 @@ config PARISC select HAVE_FTRACE_MCOUNT_RECORD if HAVE_DYNAMIC_FTRACE select HAVE_KPROBES_ON_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS - select HAVE_COPY_THREAD_TLS help The PA-RISC microprocessor is designed by Hewlett-Packard and used diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 9fa23eb320ff..3b262d87e9c4 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -186,7 +186,6 @@ config PPC select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) select HAVE_CONTEXT_TRACKING if PPC64 select HAVE_TIF_NOHZ if PPC64 - select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_STACKOVERFLOW select HAVE_DYNAMIC_FTRACE diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 128192e14ff2..f6a3a2bea3d8 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -52,7 +52,6 @@ config RISCV select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_ASM_MODVERSIONS - select HAVE_COPY_THREAD_TLS select HAVE_DMA_CONTIGUOUS if MMU select HAVE_EBPF_JIT if MMU select HAVE_FUTEX_CMPXCHG if FUTEX diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index c7d7ede6300c..959969759453 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -136,7 +136,6 @@ config S390 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL - select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index e10118d61ce7..9fc2b010e938 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -70,7 +70,6 @@ config SUPERH select ARCH_HIBERNATION_POSSIBLE if MMU select SPARSE_IRQ select HAVE_STACKPROTECTOR - select HAVE_COPY_THREAD_TLS help The SuperH is a RISC processor targeted for use in embedded systems and consumer electronics; it was also used in the Sega Dreamcast diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 66213c0cb557..5bf2dc163540 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -48,7 +48,6 @@ config SPARC select LOCKDEP_SMALL if LOCKDEP select NEED_DMA_MAP_STATE select NEED_SG_DMA_LENGTH - select HAVE_COPY_THREAD_TLS config SPARC32 def_bool !64BIT diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 9318dc6d1a0c..ef69be17ff70 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -14,7 +14,6 @@ config UML select HAVE_FUTEX_CMPXCHG if FUTEX select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_BUGVERBOSE - select HAVE_COPY_THREAD_TLS select GENERIC_IRQ_SHOW select GENERIC_CPU_DEVICES select GENERIC_CLOCKEVENTS diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig index 01451cf500d2..11ba1839d198 100644 --- a/arch/unicore32/Kconfig +++ b/arch/unicore32/Kconfig @@ -22,7 +22,6 @@ config UNICORE32 select MODULES_USE_ELF_REL select NEED_DMA_MAP_STATE select MMU_GATHER_NO_RANGE if MMU - select HAVE_COPY_THREAD_TLS help UniCore-32 is 32-bit Instruction Set Architecture, including a series of low-power-consumption RISC chip diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6a0cc524882d..214b8bf39bbe 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -161,7 +161,6 @@ config X86 select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL select HAVE_CONTEXT_TRACKING if X86_64 - select HAVE_COPY_THREAD_TLS select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 3a9f1e80394a..b71ba910d92f 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -24,7 +24,6 @@ config XTENSA select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL select HAVE_ARCH_TRACEHOOK - select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_EXIT_THREAD diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index 9f03c44941fb..77cbe14c3034 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -65,22 +65,9 @@ extern void fork_init(void); extern void release_task(struct task_struct * p); -#ifdef CONFIG_HAVE_COPY_THREAD_TLS extern int copy_thread_tls(unsigned long, unsigned long, unsigned long, struct task_struct *, unsigned long); -#else -extern int copy_thread(unsigned long, unsigned long, unsigned long, - struct task_struct *); - -/* Architectures that haven't opted into copy_thread_tls get the tls argument - * via pt_regs, so ignore the tls argument passed via C. */ -static inline int copy_thread_tls( - unsigned long clone_flags, unsigned long sp, unsigned long arg, - struct task_struct *p, unsigned long tls) -{ - return copy_thread(clone_flags, sp, arg, p); -} -#endif + extern void flush_thread(void); #ifdef CONFIG_HAVE_EXIT_THREAD diff --git a/kernel/fork.c b/kernel/fork.c index 0fd7eb1b38f9..8e52e16a1b5e 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2577,15 +2577,6 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, #ifdef __ARCH_WANT_SYS_CLONE3 -/* - * copy_thread implementations handle CLONE_SETTLS by reading the TLS value from - * the registers containing the syscall arguments for clone. This doesn't work - * with clone3 since the TLS value is passed in clone_args instead. - */ -#ifndef CONFIG_HAVE_COPY_THREAD_TLS -#error clone3 requires copy_thread_tls support in arch -#endif - noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs, struct clone_args __user *uargs, size_t usize) -- 2.11.0