Merge branch 'oprofile/urgent' into HEAD
This commit is contained in:
commit
a406ab6d77
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@ -11,10 +11,12 @@
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#include <linux/oprofile.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/compat.h>
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#include <linux/highmem.h>
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#include <asm/ptrace.h>
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#include <asm/uaccess.h>
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#include <asm/stacktrace.h>
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#include <linux/compat.h>
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static int backtrace_stack(void *data, char *name)
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{
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@ -36,17 +38,53 @@ static struct stacktrace_ops backtrace_ops = {
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.walk_stack = print_context_stack,
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};
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/* from arch/x86/kernel/cpu/perf_event.c: */
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/*
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* best effort, GUP based copy_from_user() that assumes IRQ or NMI context
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*/
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static unsigned long
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copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
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{
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unsigned long offset, addr = (unsigned long)from;
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unsigned long size, len = 0;
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struct page *page;
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void *map;
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int ret;
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do {
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ret = __get_user_pages_fast(addr, 1, 0, &page);
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if (!ret)
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break;
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offset = addr & (PAGE_SIZE - 1);
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size = min(PAGE_SIZE - offset, n - len);
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map = kmap_atomic(page);
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memcpy(to, map+offset, size);
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kunmap_atomic(map);
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put_page(page);
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len += size;
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to += size;
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addr += size;
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} while (len < n);
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return len;
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}
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#ifdef CONFIG_COMPAT
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static struct stack_frame_ia32 *
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dump_user_backtrace_32(struct stack_frame_ia32 *head)
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{
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/* Also check accessibility of one struct frame_head beyond: */
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struct stack_frame_ia32 bufhead[2];
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struct stack_frame_ia32 *fp;
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unsigned long bytes;
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/* Also check accessibility of one struct frame_head beyond */
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if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
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return NULL;
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if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
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bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
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if (bytes != sizeof(bufhead))
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return NULL;
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fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
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@ -87,12 +125,12 @@ x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
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static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
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{
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/* Also check accessibility of one struct frame_head beyond: */
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struct stack_frame bufhead[2];
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unsigned long bytes;
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/* Also check accessibility of one struct stack_frame beyond */
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if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
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return NULL;
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if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
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bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
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if (bytes != sizeof(bufhead))
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return NULL;
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oprofile_add_trace(bufhead[0].return_address);
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@ -112,8 +112,10 @@ static void nmi_cpu_start(void *dummy)
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static int nmi_start(void)
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{
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get_online_cpus();
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on_each_cpu(nmi_cpu_start, NULL, 1);
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ctr_running = 1;
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/* make ctr_running visible to the nmi handler: */
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smp_mb();
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on_each_cpu(nmi_cpu_start, NULL, 1);
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put_online_cpus();
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return 0;
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}
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@ -504,15 +506,18 @@ static int nmi_setup(void)
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nmi_enabled = 0;
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ctr_running = 0;
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barrier();
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/* make variables visible to the nmi handler: */
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smp_mb();
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err = register_die_notifier(&profile_exceptions_nb);
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if (err)
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goto fail;
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get_online_cpus();
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register_cpu_notifier(&oprofile_cpu_nb);
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on_each_cpu(nmi_cpu_setup, NULL, 1);
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nmi_enabled = 1;
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/* make nmi_enabled visible to the nmi handler: */
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smp_mb();
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on_each_cpu(nmi_cpu_setup, NULL, 1);
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put_online_cpus();
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return 0;
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@ -531,7 +536,8 @@ static void nmi_shutdown(void)
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nmi_enabled = 0;
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ctr_running = 0;
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put_online_cpus();
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barrier();
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/* make variables visible to the nmi handler: */
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smp_mb();
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unregister_die_notifier(&profile_exceptions_nb);
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msrs = &get_cpu_var(cpu_msrs);
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model->shutdown(msrs);
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