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authorPeter Zijlstra <peterz@infradead.org>2013-10-31 00:16:22 +0400
committerIngo Molnar <mingo@kernel.org>2013-11-06 15:34:25 +0400
commit0a196848ca365ec582c6d86659be456be6d4ed96 (patch)
treeb850a9d23a0b487d3e0e6c72b0974569796edf56 /kernel/events
parent394570b7939e1262f39373866166d8ee0a506e88 (diff)
downloadlinux-0a196848ca365ec582c6d86659be456be6d4ed96.tar.xz
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 'kernel/events')
-rw-r--r--kernel/events/internal.h35
1 files changed, 26 insertions, 9 deletions
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)