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>

6 files changed, 33 insertions, 16 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);
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index ca6599723be5..569b218782ad 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -82,16 +82,16 @@ static inline unsigned long perf_data_size(struct ring_buffer *rb)
 }
 
 #define DEFINE_OUTPUT_COPY(func_name, memcpy_func)                      \
-static inline unsigned int                                              \
+static inline unsigned long                                             \
 func_name(struct perf_output_handle *handle,                            \
-          const void *buf, unsigned int len)                            \
+          const void *buf, unsigned long len)                           \
 {                                                                       \
         unsigned long size, written;                                    \
                                                                         \
         do {                                                            \
-                size = min_t(unsigned long, handle->size, len);         \
-                                                                        \
+                size    = min(handle->size, len);                       \
                 written = memcpy_func(handle->addr, buf, size);         \
+                written = size - written;                               \
                                                                         \
                 len -= written;                                         \
                 handle->addr += written;                                \
@@ -110,20 +110,37 @@ func_name(struct perf_output_handle *handle,				\
         return len;                                                     \
 }
 
-static inline int memcpy_common(void *dst, const void *src, size_t n)
+static inline unsigned long
+memcpy_common(void *dst, const void *src, unsigned long n)
 {
         memcpy(dst, src, n);
-        return n;
+        return 0;
 }
 
 DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
 
-#define MEMCPY_SKIP(dst, src, n) (n)
+static inline unsigned long
+memcpy_skip(void *dst, const void *src, unsigned long n)
+{
+        return 0;
+}
 
-DEFINE_OUTPUT_COPY(__output_skip, MEMCPY_SKIP)
+DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip)
 
 #ifndef arch_perf_out_copy_user
-#define arch_perf_out_copy_user __copy_from_user_inatomic
+#define arch_perf_out_copy_user arch_perf_out_copy_user
+
+static inline unsigned long
+arch_perf_out_copy_user(void *dst, const void *src, unsigned long n)
+{
+        unsigned long ret;
+
+        pagefault_disable();
+        ret = __copy_from_user_inatomic(dst, src, n);
+        pagefault_enable();
+
+        return ret;
+}
 #endif
 
 DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)