Hi Khadija, On Wed, Mar 15, 2023 at 07:22:39PM +0500, Khadija Kamran wrote: > On Wed, Mar 15, 2023 at 02:34:31PM +0100, Fabio M. De Francesco wrote: > > Aside from what I said and asked for with the other message of this same > > thread, please take note that you can build a specific module if you prefer > > not to re-build the whole kernel and other modules at the same time. > > > > I'm pretty sure that the instructions to do so are in the OutreachyFirstPatch > > tutorial. > > > > If they are not there, please let us know. > > > > Fabio > > Hey Fabio! > > In the Outreachy FirstPatchTutorial under the 'Compiling only part of > the kernel' section there are ways to compile only some part of the > kernel. > > I have tried using "make W=1 drivers/staging/axis-fifo/" and it says > 'nothing to be done for'. Is CONFIG_XIL_AXIS_FIFO enabled in your configuration? > Should I start with the steps to reproduce? :'( I did see a report of this same warning occurring with GCC but the report I commented on cane from clang/LLVM; using that toolchain may make it easier for you to reproduce this issue. The robot's reproduction instructions are fine but I think doing it manually is actually simpler. Ubuntu 22.04 should have a pretty modern version of clang/LLVM, which you can install via 'sudo apt install clang lld llvm'. https://apt.llvm.org is another resource. First, we will grab the configuration that was provided in the report: $ wget -O .config https://download.01.org/0day-ci/archive/20230314/202303141159.6wN9HNP9-lkp@xxxxxxxxx/config Next, we want to make sure the configuration is synced, since we are technically changing compilers: $ make -j"$(nproc)" ARCH=arm64 LLVM=1 olddefconfig Finally, you should be able to build that object file and see the warning: $ make -j"$(nproc)" ARCH=arm64 LLVM=1 drivers/staging/axis-fifo/ ... drivers/staging/axis-fifo/axis-fifo.c:817:18: warning: implicit conversion from 'long' to 'int' changes value from 9223372036854775807 to -1 [-Wconstant-conversion] read_timeout = MAX_SCHEDULE_TIMEOUT; ~ ^~~~~~~~~~~~~~~~~~~~ ./include/linux/sched.h:296:31: note: expanded from macro 'MAX_SCHEDULE_TIMEOUT' #define MAX_SCHEDULE_TIMEOUT LONG_MAX ^~~~~~~~ ./include/vdso/limits.h:11:19: note: expanded from macro 'LONG_MAX' #define LONG_MAX ((long)(~0UL >> 1)) ^~~~~~~~~~~~~~~~~ drivers/staging/axis-fifo/axis-fifo.c:822:19: warning: implicit conversion from 'long' to 'int' changes value from 9223372036854775807 to -1 [-Wconstant-conversion] write_timeout = MAX_SCHEDULE_TIMEOUT; ~ ^~~~~~~~~~~~~~~~~~~~ ./include/linux/sched.h:296:31: note: expanded from macro 'MAX_SCHEDULE_TIMEOUT' #define MAX_SCHEDULE_TIMEOUT LONG_MAX ^~~~~~~~ ./include/vdso/limits.h:11:19: note: expanded from macro 'LONG_MAX' #define LONG_MAX ((long)(~0UL >> 1)) ^~~~~~~~~~~~~~~~~ 2 warnings generated. Just repeat the last step as you investigate. If you have any further issues or questions, please let me know. For the record, I am not associated with Outreachy (I am one of the maintainers of clang/LLVM support in the kernel), so if I have messed something up or overstepped some boundary, I do apologize. Cheers, Nathan
