Messages in this thread Patch in this message | | | Date | Wed, 17 Feb 2010 11:16:09 +0900 | From | Tejun Heo <> | Subject | [PATCH perf/core] percpu: add __percpu sparse annotations to trace |
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Add __percpu sparse annotations to trace.
These annotations are to make sparse consider percpu variables to be in a different address space and warn if accessed without going through percpu accessors. This patch doesn't affect normal builds.
Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> --- Trace part of __percpu sparce patches. This patch needs the following commit from mainline to define __percpu.
2938429501b73f6aeb312236eac7ed0416a07cd5
Thanks.
include/trace/ftrace.h | 2 +- kernel/trace/trace_event_profile.c | 15 ++++++++------- kernel/trace/trace_functions_graph.c | 2 +- kernel/trace/trace_ksym.c | 10 +++++----- 4 files changed, 15 insertions(+), 14 deletions(-)
Index: linux-2.6-tip/include/trace/ftrace.h =================================================================== --- linux-2.6-tip.orig/include/trace/ftrace.h +++ linux-2.6-tip/include/trace/ftrace.h @@ -773,7 +773,7 @@ __attribute__((section("_ftrace_events") * struct ftrace_event_call *event_call = &event_<call>; * extern void perf_tp_event(int, u64, u64, void *, int); * struct ftrace_raw_##call *entry; - * struct perf_trace_buf *trace_buf; + * struct perf_trace_buf __percpu *trace_buf; * u64 __addr = 0, __count = 1; * unsigned long irq_flags; * struct trace_entry *ent; Index: linux-2.6-tip/kernel/trace/trace_event_profile.c =================================================================== --- linux-2.6-tip.orig/kernel/trace/trace_event_profile.c +++ linux-2.6-tip/kernel/trace/trace_event_profile.c @@ -10,8 +10,8 @@ #include "trace.h" -static char *perf_trace_buf; -static char *perf_trace_buf_nmi; +static char __percpu *perf_trace_buf; +static char __percpu *perf_trace_buf_nmi; typedef typeof(char [FTRACE_MAX_PROFILE_SIZE]) perf_trace_t ; @@ -20,20 +20,20 @@ static int total_profile_count; static int ftrace_profile_enable_event(struct ftrace_event_call *event) { - char *buf; + char __percpu *buf; int ret = -ENOMEM; if (event->profile_count++ > 0) return 0; if (!total_profile_count) { - buf = (char *)alloc_percpu(perf_trace_t); + buf = (char __percpu *)alloc_percpu(perf_trace_t); if (!buf) goto fail_buf; rcu_assign_pointer(perf_trace_buf, buf); - buf = (char *)alloc_percpu(perf_trace_t); + buf = (char __percpu *)alloc_percpu(perf_trace_t); if (!buf) goto fail_buf_nmi; @@ -79,7 +79,7 @@ int ftrace_profile_enable(int event_id) static void ftrace_profile_disable_event(struct ftrace_event_call *event) { - char *buf, *nmi_buf; + char __percpu *buf, *nmi_buf; if (--event->profile_count > 0) return; @@ -123,7 +123,8 @@ __kprobes void *ftrace_perf_buf_prepare( int *rctxp, unsigned long *irq_flags) { struct trace_entry *entry; - char *trace_buf, *raw_data; + char __percpu *trace_buf; + char *raw_data; int pc, cpu; pc = preempt_count(); Index: linux-2.6-tip/kernel/trace/trace_functions_graph.c =================================================================== --- linux-2.6-tip.orig/kernel/trace/trace_functions_graph.c +++ linux-2.6-tip/kernel/trace/trace_functions_graph.c @@ -21,7 +21,7 @@ struct fgraph_cpu_data { }; struct fgraph_data { - struct fgraph_cpu_data *cpu_data; + struct fgraph_cpu_data __percpu *cpu_data; /* Place to preserve last processed entry. */ struct ftrace_graph_ent_entry ent; Index: linux-2.6-tip/kernel/trace/trace_ksym.c =================================================================== --- linux-2.6-tip.orig/kernel/trace/trace_ksym.c +++ linux-2.6-tip/kernel/trace/trace_ksym.c @@ -42,7 +42,7 @@ #define KSYM_TRACER_OP_LEN 3 /* rw- */ struct trace_ksym { - struct perf_event **ksym_hbp; + struct perf_event * __percpu *ksym_hbp; struct perf_event_attr attr; #ifdef CONFIG_PROFILE_KSYM_TRACER atomic64_t counter; @@ -200,8 +200,8 @@ int process_new_ksym_entry(char *ksymnam entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr, ksym_hbp_handler); - if (IS_ERR(entry->ksym_hbp)) { - ret = PTR_ERR(entry->ksym_hbp); + if (IS_ERR((void __force *)entry->ksym_hbp)) { + ret = PTR_ERR((void __force *)entry->ksym_hbp); printk(KERN_INFO "ksym_tracer request failed. Try again" " later!!\n"); goto err; @@ -331,8 +331,8 @@ static ssize_t ksym_trace_filter_write(s entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr, ksym_hbp_handler); - if (IS_ERR(entry->ksym_hbp)) - ret = PTR_ERR(entry->ksym_hbp); + if (IS_ERR((void __force *)entry->ksym_hbp)) + ret = PTR_ERR((void __force *)entry->ksym_hbp); else goto out_unlock; }
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