WARNING: line length of 81 exceeds 80 columns
#36: FILE: include/linux/mailbox_client.h:28:
+ *			write to, and size it the size of the buffer to allocate.

WARNING: line length of 82 exceeds 80 columns
#37: FILE: include/linux/mailbox_client.h:29:
+ *			inside the buffer where the mailbox should write the data.

WARNING: line length of 89 exceeds 80 columns
#45: FILE: include/linux/mailbox_client.h:41:
+	void (*rx_alloc)(struct mbox_client *cl, void **handle, void **buffer, int size);

total: 0 errors, 3 warnings, 0 checks, 19 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit d19b08480379 ("mailbox: add callback function for rx buffer allocation") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 3 warnings, 0 checks, 19 lines checked