Support for the Compute Express Link (CXL) Dynamic Capacity Devices (DCD) have grown a number of uses to print struct range.[1] Support for a printf specifier '%pra' was being worked within a large series and has garnered a number of comments and discussion. To better accelerate both features introduce a separate series to settle the struct range print enhancement divorced from the CXL DCD feature. Struct range is used to store a number range similar to struct resource. Printing struct range becomes cumbersome having to specify 2 specifiers and the members of the struct. Furthermore, print output benefits from using a standardized format. Add to the pointer specifier support for struct range. Share code with struct resource for more standardization. Add tests for struct resource to help prevent regressions. %pra was settled on as the most reasonable format in previous discussions.[2] Link: https://lore.kernel.org/all/20241007-dcd-type2-upstream-v4-2-c261ee6eeded@xxxxxxxxx/ [1] Link: https://lore.kernel.org/all/66cea3bf3332f_f937b29424@iweiny-mobl.notmuch/ [2] Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> --- Changes in v2: - Andy: s/resource_and_range/resource_or_range/ - djbw/Petr: Address comments on documentation - Link to v1: https://patch.msgid.link/20241018-cxl-pra-v1-0-7f49ba58208b@xxxxxxxxx --- Ira Weiny (4): test printf: Add very basic struct resource tests Documentation/printf: struct resource add start == end special case printf: Add print format (%pra) for struct range cxl/cdat: Use %pra for dpa range outputs Documentation/core-api/printk-formats.rst | 20 +++++++++- drivers/cxl/core/cdat.c | 8 ++-- include/linux/range.h | 6 +++ lib/test_printf.c | 61 +++++++++++++++++++++++++++++++ lib/vsprintf.c | 57 ++++++++++++++++++++++++++--- 5 files changed, 141 insertions(+), 11 deletions(-) --- base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc change-id: 20240930-cxl-pra-53956ac5fc1e Best regards, -- Ira Weiny <ira.weiny@xxxxxxxxx>
