From 1c0c1b93df4dad43b8050db005bb1c03bc7e09bf Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Tue, 23 Sep 2014 10:50:57 -0700 Subject: [PATCH] x86_64/vdso: Clean up vgetcpu init and merge the vdso initcalls Now vdso/vma.c has a single initcall and no references to "vsyscall". Signed-off-by: Andy Lutomirski Link: http://lkml.kernel.org/r/945c463e2804fedd8b08d63a040cbe85d55195aa.1411494540.git.luto@amacapital.net Signed-off-by: Ingo Molnar --- arch/x86/vdso/vma.c | 54 +++++++++++++++------------------------------ 1 file changed, 18 insertions(+), 36 deletions(-) diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c index 32ca60c8157b..a280b11e2122 100644 --- a/arch/x86/vdso/vma.c +++ b/arch/x86/vdso/vma.c @@ -1,7 +1,8 @@ /* - * Set up the VMAs to tell the VM about the vDSO. * Copyright 2007 Andi Kleen, SUSE Labs. * Subject to the GPL, v.2 + * + * This contains most of the x86 vDSO kernel-side code. */ #include #include @@ -11,18 +12,16 @@ #include #include #include -#include #include #include #include +#include #include #include #include #if defined(CONFIG_X86_64) unsigned int __read_mostly vdso64_enabled = 1; - -extern unsigned short vdso_sync_cpuid; #endif void __init init_vdso_image(const struct vdso_image *image) @@ -40,20 +39,6 @@ void __init init_vdso_image(const struct vdso_image *image) image->alt_len)); } -#if defined(CONFIG_X86_64) -static int __init init_vdso(void) -{ - init_vdso_image(&vdso_image_64); - -#ifdef CONFIG_X86_X32_ABI - init_vdso_image(&vdso_image_x32); -#endif - - return 0; -} -subsys_initcall(init_vdso); -#endif - struct linux_binprm; /* Put the vdso above the (randomized) stack with another randomized offset. @@ -242,12 +227,9 @@ __setup("vdso=", vdso_setup); #endif #ifdef CONFIG_X86_64 -/* - * Assume __initcall executes before all user space. Hopefully kmod - * doesn't violate that. We'll find out if it does. - */ -static void vsyscall_set_cpu(int cpu) +static void vgetcpu_cpu_init(void *arg) { + int cpu = smp_processor_id(); struct desc_struct d; unsigned long node = 0; #ifdef CONFIG_NUMA @@ -274,34 +256,34 @@ static void vsyscall_set_cpu(int cpu) write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S); } -static void cpu_vsyscall_init(void *arg) -{ - /* preemption should be already off */ - vsyscall_set_cpu(raw_smp_processor_id()); -} - static int -cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void *arg) +vgetcpu_cpu_notifier(struct notifier_block *n, unsigned long action, void *arg) { long cpu = (long)arg; if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) - smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 1); + smp_call_function_single(cpu, vgetcpu_cpu_init, NULL, 1); return NOTIFY_DONE; } -static int __init vsyscall_init(void) +static int __init init_vdso(void) { + init_vdso_image(&vdso_image_64); + +#ifdef CONFIG_X86_X32_ABI + init_vdso_image(&vdso_image_x32); +#endif + cpu_notifier_register_begin(); - on_each_cpu(cpu_vsyscall_init, NULL, 1); + on_each_cpu(vgetcpu_cpu_init, NULL, 1); /* notifier priority > KVM */ - __hotcpu_notifier(cpu_vsyscall_notifier, 30); + __hotcpu_notifier(vgetcpu_cpu_notifier, 30); cpu_notifier_register_done(); return 0; } -__initcall(vsyscall_init); -#endif +subsys_initcall(init_vdso); +#endif /* CONFIG_X86_64 */ -- 2.20.1