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authorPeter Zijlstra <peterz@infradead.org>2013-10-30 21:16:22 +0100
committerIngo Molnar <mingo@kernel.org>2013-11-06 12:34:25 +0100
commit0a196848ca365ec582c6d86659be456be6d4ed96 (patch)
treeb850a9d23a0b487d3e0e6c72b0974569796edf56 /arch/x86
parent394570b7939e1262f39373866166d8ee0a506e88 (diff)
perf: Fix arch_perf_out_copy_user default
The arch_perf_output_copy_user() default of __copy_from_user_inatomic() returns bytes not copied, while all other argument functions given DEFINE_OUTPUT_COPY() return bytes copied. Since copy_from_user_nmi() is the odd duck out by returning bytes copied where all other *copy_{to,from}* functions return bytes not copied, change it over and ammend DEFINE_OUTPUT_COPY() to expect bytes not copied. Oddly enough DEFINE_OUTPUT_COPY() already returned bytes not copied while expecting its worker functions to return bytes copied. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: will.deacon@arm.com Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20131030201622.GR16117@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/cpu/perf_event.c4
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel_ds.c2
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel_lbr.c2
-rw-r--r--arch/x86/lib/usercopy.c2
-rw-r--r--arch/x86/oprofile/backtrace.c4
5 files changed, 7 insertions, 7 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 8a87a3224121..8e132931614d 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1989,7 +1989,7 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
frame.return_address = 0;
bytes = copy_from_user_nmi(&frame, fp, sizeof(frame));
- if (bytes != sizeof(frame))
+ if (bytes != 0)
break;
if (!valid_user_frame(fp, sizeof(frame)))
@@ -2041,7 +2041,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
frame.return_address = 0;
bytes = copy_from_user_nmi(&frame, fp, sizeof(frame));
- if (bytes != sizeof(frame))
+ if (bytes != 0)
break;
if (!valid_user_frame(fp, sizeof(frame)))
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index c1760ff3c757..ae96cfa5eddd 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -789,7 +789,7 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
size = ip - to; /* Must fit our buffer, see above */
bytes = copy_from_user_nmi(buf, (void __user *)to, size);
- if (bytes != size)
+ if (bytes != 0)
return 0;
kaddr = buf;
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 90ee6c1d0542..d82d155aca8c 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -491,7 +491,7 @@ static int branch_type(unsigned long from, unsigned long to, int abort)
/* may fail if text not present */
bytes = copy_from_user_nmi(buf, (void __user *)from, size);
- if (bytes != size)
+ if (bytes != 0)
return X86_BR_NONE;
addr = buf;
diff --git a/arch/x86/lib/usercopy.c b/arch/x86/lib/usercopy.c
index 5465b8613944..ddf9ecb53cc3 100644
--- a/arch/x86/lib/usercopy.c
+++ b/arch/x86/lib/usercopy.c
@@ -31,6 +31,6 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
ret = __copy_from_user_inatomic(to, from, n);
pagefault_enable();
- return n - ret;
+ return ret;
}
EXPORT_SYMBOL_GPL(copy_from_user_nmi);
diff --git a/arch/x86/oprofile/backtrace.c b/arch/x86/oprofile/backtrace.c
index d6aa6e8315d1..5d04be5efb64 100644
--- a/arch/x86/oprofile/backtrace.c
+++ b/arch/x86/oprofile/backtrace.c
@@ -47,7 +47,7 @@ dump_user_backtrace_32(struct stack_frame_ia32 *head)
unsigned long bytes;
bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
- if (bytes != sizeof(bufhead))
+ if (bytes != 0)
return NULL;
fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
@@ -93,7 +93,7 @@ static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
unsigned long bytes;
bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
- if (bytes != sizeof(bufhead))
+ if (bytes != 0)
return NULL;
oprofile_add_trace(bufhead[0].return_address);