[tip:x86/vdso] x86_64/vdso: Clean up vgetcpu init and merge the vdso initcalls

From: tip-bot for Andy Lutomirski
Date: Tue Oct 28 2014 - 07:16:34 EST


Commit-ID: 1c0c1b93df4dad43b8050db005bb1c03bc7e09bf
Gitweb: http://git.kernel.org/tip/1c0c1b93df4dad43b8050db005bb1c03bc7e09bf
Author: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
AuthorDate: Tue, 23 Sep 2014 10:50:57 -0700
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 28 Oct 2014 11:22:14 +0100

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 <luto@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/945c463e2804fedd8b08d63a040cbe85d55195aa.1411494540.git.luto@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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 32ca60c..a280b11 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 <linux/mm.h>
#include <linux/err.h>
@@ -11,18 +12,16 @@
#include <linux/random.h>
#include <linux/elf.h>
#include <linux/cpu.h>
-#include <asm/vsyscall.h>
#include <asm/vgtod.h>
#include <asm/proto.h>
#include <asm/vdso.h>
+#include <asm/vvar.h>
#include <asm/page.h>
#include <asm/hpet.h>
#include <asm/desc.h>

#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 */
--
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