diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2013-10-31 00:16:22 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-11-06 15:34:25 +0400 |
| commit | 0a196848ca365ec582c6d86659be456be6d4ed96 (patch) | |
| tree | b850a9d23a0b487d3e0e6c72b0974569796edf56 /arch/x86/lib | |
| parent | 394570b7939e1262f39373866166d8ee0a506e88 (diff) | |
| download | linux-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 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/usercopy.c | 2 |
1 files changed, 1 insertions, 1 deletions
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); |