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kcov: fix struct layout for kcov_remote_arg

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Make the layout of kcov_remote_arg the same for 32-bit and 64-bit code.
This makes it more convenient to write userspace apps that can be
compiled into 32-bit or 64-bit binaries and still work with the same
64-bit kernel.

Also use proper __u32 types in uapi headers instead of unsigned ints.

Link: http://lkml.kernel.org/r/9e91020876029cfefc9211ff747685eba9536426.1575638983.git.andreyknvl@google.com
Fixes: eec028c938 ("kcov: remote coverage support")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: "Jacky . Cao @ sony . com" <Jacky.Cao@sony.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-01-04 12:59:39 -08:00 • committed by Linus Torvalds
parent ac8f05da51
commit a69b83e1ae
2 changed files with 10 additions and 10 deletions
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10
Documentation/dev-tools/kcov.rst
View file

@ -251,11 +251,11 @@ selectively from different subsystems.
.. code-block:: c
struct kcov_remote_arg {
unsigned trace_mode;
unsigned area_size;
unsigned num_handles;
uint64_t common_handle;
uint64_t handles[0];
__u32 trace_mode;
__u32 area_size;
__u32 num_handles;
__aligned_u64 common_handle;
__aligned_u64 handles[0];
};
#define KCOV_INIT_TRACE _IOR('c', 1, unsigned long)

10
include/uapi/linux/kcov.h
View file

@ -9,11 +9,11 @@
* and the comment before kcov_remote_start() for usage details.
*/
struct kcov_remote_arg {
unsigned int trace_mode; /* KCOV_TRACE_PC or KCOV_TRACE_CMP */
unsigned int area_size; /* Length of coverage buffer in words */
unsigned int num_handles; /* Size of handles array */
__u64 common_handle;
__u64 handles[0];
__u32 trace_mode; /* KCOV_TRACE_PC or KCOV_TRACE_CMP */
__u32 area_size; /* Length of coverage buffer in words */
__u32 num_handles; /* Size of handles array */
__aligned_u64 common_handle;
__aligned_u64 handles[0];
};
#define KCOV_REMOTE_MAX_HANDLES 0x100