diff options
Diffstat (limited to 'arch/riscv/kernel')
| -rw-r--r-- | arch/riscv/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/riscv/kernel/entry.S | 8 | ||||
| -rw-r--r-- | arch/riscv/kernel/head.S | 2 | ||||
| -rw-r--r-- | arch/riscv/kernel/smp.c | 9 | ||||
| -rw-r--r-- | arch/riscv/kernel/stacktrace.c | 12 | ||||
| -rw-r--r-- | arch/riscv/kernel/syscall_table.c | 1 | ||||
| -rw-r--r-- | arch/riscv/kernel/vdso.c | 53 | ||||
| -rw-r--r-- | arch/riscv/kernel/vdso/vdso.lds.S | 3 |
8 files changed, 43 insertions, 46 deletions
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c index 90f8ce64fa6f..478d9f02dab5 100644 --- a/arch/riscv/kernel/asm-offsets.c +++ b/arch/riscv/kernel/asm-offsets.c @@ -33,7 +33,6 @@ void asm_offsets(void) OFFSET(TASK_TI_PREEMPT_COUNT, task_struct, thread_info.preempt_count); OFFSET(TASK_TI_KERNEL_SP, task_struct, thread_info.kernel_sp); OFFSET(TASK_TI_USER_SP, task_struct, thread_info.user_sp); - OFFSET(TASK_TI_CPU, task_struct, thread_info.cpu); OFFSET(TASK_THREAD_F0, task_struct, thread.fstate.f[0]); OFFSET(TASK_THREAD_F1, task_struct, thread.fstate.f[1]); diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 98f502654edd..ed29e9c8f660 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -130,8 +130,7 @@ skip_context_tracking: /* Handle interrupts */ move a0, sp /* pt_regs */ - la a1, handle_arch_irq - REG_L a1, (a1) + la a1, generic_handle_arch_irq jr a1 1: /* @@ -544,11 +543,6 @@ ENTRY(__switch_to) REG_L s9, TASK_THREAD_S9_RA(a4) REG_L s10, TASK_THREAD_S10_RA(a4) REG_L s11, TASK_THREAD_S11_RA(a4) - /* Swap the CPU entry around. */ - lw a3, TASK_TI_CPU(a0) - lw a4, TASK_TI_CPU(a1) - sw a3, TASK_TI_CPU(a1) - sw a4, TASK_TI_CPU(a0) /* The offset of thread_info in task_struct is zero. */ move tp, a1 ret diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index fce5184b22c3..25ec50573957 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -193,6 +193,7 @@ setup_trap_vector: csrw CSR_SCRATCH, zero ret +.align 2 .Lsecondary_park: /* We lack SMP support or have too many harts, so park this hart */ wfi @@ -317,7 +318,6 @@ clear_bss_done: call setup_trap_vector /* Restore C environment */ la tp, init_task - sw zero, TASK_TI_CPU(tp) la sp, init_thread_union + THREAD_SIZE #ifdef CONFIG_KASAN diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index 921d9d7df400..2f6da845c9ae 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -140,12 +140,9 @@ void arch_irq_work_raise(void) void handle_IPI(struct pt_regs *regs) { - struct pt_regs *old_regs = set_irq_regs(regs); unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits; unsigned long *stats = ipi_data[smp_processor_id()].stats; - irq_enter(); - riscv_clear_ipi(); while (true) { @@ -156,7 +153,7 @@ void handle_IPI(struct pt_regs *regs) ops = xchg(pending_ipis, 0); if (ops == 0) - goto done; + return; if (ops & (1 << IPI_RESCHEDULE)) { stats[IPI_RESCHEDULE]++; @@ -189,10 +186,6 @@ void handle_IPI(struct pt_regs *regs) /* Order data access and bit testing. */ mb(); } - -done: - irq_exit(); - set_irq_regs(old_regs); } static const char * const ipi_names[] = { diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c index 315db3d0229b..0fcdc0233fac 100644 --- a/arch/riscv/kernel/stacktrace.c +++ b/arch/riscv/kernel/stacktrace.c @@ -128,16 +128,14 @@ static bool save_wchan(void *arg, unsigned long pc) return true; } -unsigned long get_wchan(struct task_struct *task) +unsigned long __get_wchan(struct task_struct *task) { unsigned long pc = 0; - if (likely(task && task != current && !task_is_running(task))) { - if (!try_get_task_stack(task)) - return 0; - walk_stackframe(task, NULL, save_wchan, &pc); - put_task_stack(task); - } + if (!try_get_task_stack(task)) + return 0; + walk_stackframe(task, NULL, save_wchan, &pc); + put_task_stack(task); return pc; } diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c index a63c667c27b3..44b1420a2270 100644 --- a/arch/riscv/kernel/syscall_table.c +++ b/arch/riscv/kernel/syscall_table.c @@ -7,7 +7,6 @@ #include <linux/linkage.h> #include <linux/syscalls.h> #include <asm-generic/syscalls.h> -#include <asm/vdso.h> #include <asm/syscall.h> #undef __SYSCALL diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c index 25a3b8849599..b70956d80408 100644 --- a/arch/riscv/kernel/vdso.c +++ b/arch/riscv/kernel/vdso.c @@ -12,14 +12,24 @@ #include <linux/binfmts.h> #include <linux/err.h> #include <asm/page.h> +#include <asm/vdso.h> + #ifdef CONFIG_GENERIC_TIME_VSYSCALL #include <vdso/datapage.h> #else -#include <asm/vdso.h> +struct vdso_data { +}; #endif extern char vdso_start[], vdso_end[]; +enum vvar_pages { + VVAR_DATA_PAGE_OFFSET, + VVAR_NR_PAGES, +}; + +#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT) + static unsigned int vdso_pages __ro_after_init; static struct page **vdso_pagelist __ro_after_init; @@ -38,7 +48,7 @@ static int __init vdso_init(void) vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT; vdso_pagelist = - kcalloc(vdso_pages + 1, sizeof(struct page *), GFP_KERNEL); + kcalloc(vdso_pages + VVAR_NR_PAGES, sizeof(struct page *), GFP_KERNEL); if (unlikely(vdso_pagelist == NULL)) { pr_err("vdso: pagelist allocation failed\n"); return -ENOMEM; @@ -63,38 +73,41 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, unsigned long vdso_base, vdso_len; int ret; - vdso_len = (vdso_pages + 1) << PAGE_SHIFT; + BUILD_BUG_ON(VVAR_NR_PAGES != __VVAR_PAGES); + + vdso_len = (vdso_pages + VVAR_NR_PAGES) << PAGE_SHIFT; + + if (mmap_write_lock_killable(mm)) + return -EINTR; - mmap_write_lock(mm); vdso_base = get_unmapped_area(NULL, 0, vdso_len, 0, 0); if (IS_ERR_VALUE(vdso_base)) { ret = vdso_base; goto end; } - /* - * Put vDSO base into mm struct. We need to do this before calling - * install_special_mapping or the perf counter mmap tracking code - * will fail to recognise it as a vDSO (since arch_vma_name fails). - */ - mm->context.vdso = (void *)vdso_base; + mm->context.vdso = NULL; + ret = install_special_mapping(mm, vdso_base, VVAR_SIZE, + (VM_READ | VM_MAYREAD), &vdso_pagelist[vdso_pages]); + if (unlikely(ret)) + goto end; ret = - install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, + install_special_mapping(mm, vdso_base + VVAR_SIZE, + vdso_pages << PAGE_SHIFT, (VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC), vdso_pagelist); - if (unlikely(ret)) { - mm->context.vdso = NULL; + if (unlikely(ret)) goto end; - } - vdso_base += (vdso_pages << PAGE_SHIFT); - ret = install_special_mapping(mm, vdso_base, PAGE_SIZE, - (VM_READ | VM_MAYREAD), &vdso_pagelist[vdso_pages]); + /* + * Put vDSO base into mm struct. We need to do this before calling + * install_special_mapping or the perf counter mmap tracking code + * will fail to recognise it as a vDSO (since arch_vma_name fails). + */ + mm->context.vdso = (void *)vdso_base + VVAR_SIZE; - if (unlikely(ret)) - mm->context.vdso = NULL; end: mmap_write_unlock(mm); return ret; @@ -105,7 +118,7 @@ const char *arch_vma_name(struct vm_area_struct *vma) if (vma->vm_mm && (vma->vm_start == (long)vma->vm_mm->context.vdso)) return "[vdso]"; if (vma->vm_mm && (vma->vm_start == - (long)vma->vm_mm->context.vdso + PAGE_SIZE)) + (long)vma->vm_mm->context.vdso - VVAR_SIZE)) return "[vdso_data]"; return NULL; } diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S index e6f558bca71b..e9111f700af0 100644 --- a/arch/riscv/kernel/vdso/vdso.lds.S +++ b/arch/riscv/kernel/vdso/vdso.lds.S @@ -3,12 +3,13 @@ * Copyright (C) 2012 Regents of the University of California */ #include <asm/page.h> +#include <asm/vdso.h> OUTPUT_ARCH(riscv) SECTIONS { - PROVIDE(_vdso_data = . + PAGE_SIZE); + PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); . = SIZEOF_HEADERS; .hash : { *(.hash) } :text |