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SubjectRe: [PATCH v2 4/5] binder: convert logging macros into functions
On Fri, Apr 29, 2022 at 4:57 PM Carlos Llamas <cmllamas@google.com> wrote:
>
> Converting binder_debug() and binder_user_error() macros into functions
> reduces the overall object size by 16936 bytes when cross-compiled with
> aarch64-linux-gnu-gcc 11.2.0:
>
> $ size drivers/android/binder.o.{old,new}
> text data bss dec hex filename
> 77935 6168 20264 104367 197af drivers/android/binder.o.old
> 65551 1616 20264 87431 15587 drivers/android/binder.o.new
>
> This is particularly beneficial to functions binder_transaction() and
> binder_thread_write() which repeatedly use these macros and are both
> part of the critical path for all binder transactions.
>
> $ nm --size vmlinux.{old,new} |grep ' binder_transaction$'
> 0000000000002f60 t binder_transaction
> 0000000000002358 t binder_transaction
>
> $ nm --size vmlinux.{old,new} |grep binder_thread_write
> 0000000000001c54 t binder_thread_write
> 00000000000014a8 t binder_thread_write
>
> Signed-off-by: Carlos Llamas <cmllamas@google.com>

Acked-by: Todd Kjos <tkjos@google.com>

> ---
> drivers/android/binder.c | 41 ++++++++++++++++++++++++++++------------
> 1 file changed, 29 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index b9df0c8a68d3..bfb21e258427 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -133,19 +133,36 @@ static int binder_set_stop_on_user_error(const char *val,
> module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
> param_get_int, &binder_stop_on_user_error, 0644);
>
> -#define binder_debug(mask, x...) \
> - do { \
> - if (binder_debug_mask & mask) \
> - pr_info_ratelimited(x); \
> - } while (0)
> +static __printf(2, 3) void binder_debug(int mask, const char *format, ...)
> +{
> + struct va_format vaf;
> + va_list args;
>
> -#define binder_user_error(x...) \
> - do { \
> - if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
> - pr_info_ratelimited(x); \
> - if (binder_stop_on_user_error) \
> - binder_stop_on_user_error = 2; \
> - } while (0)
> + if (binder_debug_mask & mask) {
> + va_start(args, format);
> + vaf.va = &args;
> + vaf.fmt = format;
> + pr_info_ratelimited("%pV", &vaf);
> + va_end(args);
> + }
> +}
> +
> +static __printf(1, 2) void binder_user_error(const char *format, ...)
> +{
> + struct va_format vaf;
> + va_list args;
> +
> + if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) {
> + va_start(args, format);
> + vaf.va = &args;
> + vaf.fmt = format;
> + pr_info_ratelimited("%pV", &vaf);
> + va_end(args);
> + }
> +
> + if (binder_stop_on_user_error)
> + binder_stop_on_user_error = 2;
> +}
>
> #define binder_set_extended_error(ee, _id, _command, _param) \
> do { \
> --
> 2.36.0.464.gb9c8b46e94-goog
>

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