Re: pr_debug
On Thu, Mar 16, 2017 at 01:17:42PM +0200, Alexander Kapshuk wrote: > On Wed, Mar 15, 2017 at 11:15 PM, Tobin C. Hardingwrote: > > On Wed, Mar 15, 2017 at 12:12:48PM +0100, Bjørn Mork wrote: > >> Alexander Kapshuk writes: > >> > >> >>> On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Harding > >> >>> wrote: > >> >>> > why does calling pr_debug() with more than one argument cause a > >> >>> > sparse > >> >>> > warning? > >> >>> > > >> >>> > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in > >> >>> > initializer > >> >>> > > >> >>> > sdio_io.c:70: > >> >>> > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); > >> .. > >> > 'sdio_func_id()' is a macro defined here: > >> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2 > >> > #define sdio_func_id(f) (dev_name(&(f)->dev)) > >> > >> > >> So the "func" in that debug call contains a 'struct device'. Any > >> reason why the pr_debug() shouldn't be converted to something like > >> > >> dev_dbg(>dev, "SDIO: Enabling device...\n"); > > > > Good point Bjørn, thanks. And thank you Alexander for your input. I > > fear I may have sent you both on a wild goose chase with the example > > that I chose. pr_debug() causes a sparse warning in many instances > > when the format string includes format specifiers. > > > > /* this is fine */ > > pr_debug("some info string"); > > > > /* this often causes Sparse warning */ > > pr_debug("string with specifier: %d", foo); > > > > A simple example can be seen by adding this function > > > > void foo(const char *baz) > > { > > pr_debug("cause Sparse warning - %s\n", baz); > > } > > > > To a random driver, and running `make C=2 M=drivers/staging/ks7010` > > > > drivers/staging/ks7010/ks_hostif.c:2702:9: error: unknown field name in > > initializer > > > > For more examples from the kernel tree, running: > > $ make -j9 C=2 M=drivers/staging 2>sparse.out > > > > gives many such cases, for example: > > > > drivers/staging/fbtft/fbtft-core.c:472:17: error: unknown field name in > > initialize > > drivers/staging/media/bcm2048/radio-bcm2048.c:2596:17: error: unknown field > > name in initializer > > drivers/staging/dgnc/dgnc_tty.c:1274:17: error: unknown field name in > > initializer > > > > Also dev_debug causes the same sparse warning at times, for example: > > > > drivers/staging/comedi/comedi_fops.c:352:17: error: unknown field name in > > initialize > > > > if (s->busy) { > > dev_dbg(dev->class_dev, > > "subdevice is busy, cannot resize buffer\n"); > > return -EBUSY; > > } > > > > And 2 more example instances of dev_debug: > > drivers/staging/comedi/drivers/das16.c:578:25: error: unknown field name in > > initialize > > drivers/staging/dgnc/dgnc_tty.c:1274:17: error: unknown field name in > > initializer > > > > thanks, > > Tobin. > > The pr_debug() manpage, https://www.kernel.org/doc/local/pr_debug.txt, > states that: > > Some files call pr_debug(), which is ordinarily an empty macro that discards > its arguments at compile time. To enable debugging output, build the > appropriate file with -DDEBUG by adding > > CFLAGS_[filename].o := -DDEBUG > > to the makefile. > > You did not mention whether you have compiling those modules with the > DEBUG flag enabled, so, perhaps if you didn't, that could be the > reason why you've been getting those errors. Nice suggestion, thanks. I have DEBUG enabled. thanks, Tobin. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Wed, Mar 15, 2017 at 11:15 PM, Tobin C. Hardingwrote: > On Wed, Mar 15, 2017 at 12:12:48PM +0100, Bjørn Mork wrote: >> Alexander Kapshuk writes: >> >> >>> On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Harding wrote: >> >>> > why does calling pr_debug() with more than one argument cause a sparse >> >>> > warning? >> >>> > >> >>> > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in >> >>> > initializer >> >>> > >> >>> > sdio_io.c:70: >> >>> > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); >> .. >> > 'sdio_func_id()' is a macro defined here: >> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2 >> > #define sdio_func_id(f) (dev_name(&(f)->dev)) >> >> >> So the "func" in that debug call contains a 'struct device'. Any >> reason why the pr_debug() shouldn't be converted to something like >> >> dev_dbg(>dev, "SDIO: Enabling device...\n"); > > Good point Bjørn, thanks. And thank you Alexander for your input. I > fear I may have sent you both on a wild goose chase with the example > that I chose. pr_debug() causes a sparse warning in many instances > when the format string includes format specifiers. > > /* this is fine */ > pr_debug("some info string"); > > /* this often causes Sparse warning */ > pr_debug("string with specifier: %d", foo); > > A simple example can be seen by adding this function > > void foo(const char *baz) > { > pr_debug("cause Sparse warning - %s\n", baz); > } > > To a random driver, and running `make C=2 M=drivers/staging/ks7010` > > drivers/staging/ks7010/ks_hostif.c:2702:9: error: unknown field name in > initializer > > For more examples from the kernel tree, running: > $ make -j9 C=2 M=drivers/staging 2>sparse.out > > gives many such cases, for example: > > drivers/staging/fbtft/fbtft-core.c:472:17: error: unknown field name in > initialize > drivers/staging/media/bcm2048/radio-bcm2048.c:2596:17: error: unknown field > name in initializer > drivers/staging/dgnc/dgnc_tty.c:1274:17: error: unknown field name in > initializer > > Also dev_debug causes the same sparse warning at times, for example: > > drivers/staging/comedi/comedi_fops.c:352:17: error: unknown field name in > initialize > > if (s->busy) { > dev_dbg(dev->class_dev, > "subdevice is busy, cannot resize buffer\n"); > return -EBUSY; > } > > And 2 more example instances of dev_debug: > drivers/staging/comedi/drivers/das16.c:578:25: error: unknown field name in > initialize > drivers/staging/dgnc/dgnc_tty.c:1274:17: error: unknown field name in > initializer > > thanks, > Tobin. The pr_debug() manpage, https://www.kernel.org/doc/local/pr_debug.txt, states that: Some files call pr_debug(), which is ordinarily an empty macro that discards its arguments at compile time. To enable debugging output, build the appropriate file with -DDEBUG by adding CFLAGS_[filename].o := -DDEBUG to the makefile. You did not mention whether you have compiling those modules with the DEBUG flag enabled, so, perhaps if you didn't, that could be the reason why you've been getting those errors. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Wed, Mar 15, 2017 at 12:12:48PM +0100, Bjørn Mork wrote: > Alexander Kapshukwrites: > > >>> On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Harding wrote: > >>> > why does calling pr_debug() with more than one argument cause a sparse > >>> > warning? > >>> > > >>> > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in > >>> > initializer > >>> > > >>> > sdio_io.c:70: > >>> > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); > .. > > 'sdio_func_id()' is a macro defined here: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2 > > #define sdio_func_id(f) (dev_name(&(f)->dev)) > > > So the "func" in that debug call contains a 'struct device'. Any > reason why the pr_debug() shouldn't be converted to something like > > dev_dbg(>dev, "SDIO: Enabling device...\n"); Good point Bjørn, thanks. And thank you Alexander for your input. I fear I may have sent you both on a wild goose chase with the example that I chose. pr_debug() causes a sparse warning in many instances when the format string includes format specifiers. /* this is fine */ pr_debug("some info string"); /* this often causes Sparse warning */ pr_debug("string with specifier: %d", foo); A simple example can be seen by adding this function void foo(const char *baz) { pr_debug("cause Sparse warning - %s\n", baz); } To a random driver, and running `make C=2 M=drivers/staging/ks7010` drivers/staging/ks7010/ks_hostif.c:2702:9: error: unknown field name in initializer For more examples from the kernel tree, running: $ make -j9 C=2 M=drivers/staging 2>sparse.out gives many such cases, for example: drivers/staging/fbtft/fbtft-core.c:472:17: error: unknown field name in initialize drivers/staging/media/bcm2048/radio-bcm2048.c:2596:17: error: unknown field name in initializer drivers/staging/dgnc/dgnc_tty.c:1274:17: error: unknown field name in initializer Also dev_debug causes the same sparse warning at times, for example: drivers/staging/comedi/comedi_fops.c:352:17: error: unknown field name in initialize if (s->busy) { dev_dbg(dev->class_dev, "subdevice is busy, cannot resize buffer\n"); return -EBUSY; } And 2 more example instances of dev_debug: drivers/staging/comedi/drivers/das16.c:578:25: error: unknown field name in initialize drivers/staging/dgnc/dgnc_tty.c:1274:17: error: unknown field name in initializer thanks, Tobin. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
Alexander Kapshukwrites: >>> On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Harding wrote: >>> > why does calling pr_debug() with more than one argument cause a sparse >>> > warning? >>> > >>> > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in initializer >>> > >>> > sdio_io.c:70: >>> > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); .. > 'sdio_func_id()' is a macro defined here: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2 > #define sdio_func_id(f) (dev_name(&(f)->dev)) So the "func" in that debug call contains a 'struct device'. Any reason why the pr_debug() shouldn't be converted to something like dev_dbg(>dev, "SDIO: Enabling device...\n"); ? Bjørn ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Wed, Mar 15, 2017 at 12:40 PM, Tobin C. Hardingwrote: > On Wed, Mar 15, 2017 at 12:01:39PM +0200, Alexander Kapshuk wrote: >> On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Harding wrote: >> > why does calling pr_debug() with more than one argument cause a sparse >> > warning? >> > >> > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in initializer >> > >> > sdio_io.c:70: >> > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); >> > >> > What can we do about this? >> > >> > thanks, >> > Tobin. >> > >> > ___ >> > Kernelnewbies mailing list >> > Kernelnewbies@kernelnewbies.org >> > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> What is the version of the sources you are using? > > I'm usually working of gregKH's staging tree using branch staging-next > and/or staging-testing > > thanks, > Tobin. 'sdio_func_id()' is a macro defined here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2 #define sdio_func_id(f) (dev_name(&(f)->dev)) The 'func' parameter passed into 'sdio_func_id()' is a pointer to 'struct device dev', which is a member of 'struct sdio_func' defined here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/linux/mmc/sdio_func.h?id=refs/tags/v4.11-rc2 Based on my understanding of the error message you got, the error must lie in code that initialises 'func' to a field name of a struct that isn't known at compile time. At this stage, I'm not sure how to identify the code where the faulty initialisation takes place. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Wed, Mar 15, 2017 at 12:01:39PM +0200, Alexander Kapshuk wrote: > On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Hardingwrote: > > why does calling pr_debug() with more than one argument cause a sparse > > warning? > > > > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in initializer > > > > sdio_io.c:70: > > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); > > > > What can we do about this? > > > > thanks, > > Tobin. > > > > ___ > > Kernelnewbies mailing list > > Kernelnewbies@kernelnewbies.org > > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > What is the version of the sources you are using? I'm usually working of gregKH's staging tree using branch staging-next and/or staging-testing thanks, Tobin. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Wed, Mar 15, 2017 at 10:31 AM, Tobin C. Hardingwrote: > why does calling pr_debug() with more than one argument cause a sparse > warning? > > drivers/mmc/core/sdio_io.c:70:9: error: unknown field name in initializer > > sdio_io.c:70: > pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); > > What can we do about this? > > thanks, > Tobin. > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies What is the version of the sources you are using? ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Tue, May 10, 2016 at 09:33:46AM +0200, Greg KH wrote: > Please read Documentation/dynamic-debug-howto.txt thanks Greg, your are a gentleman. tobin ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: pr_debug
On Tue, May 10, 2016 at 05:21:35PM +1000, Tobin Harding wrote: > pr_debug messages do not appear in dmesg output (or via cat /proc/kmsg). I > have > set console level to 8 (cat /proc/sys/kernel/printk -> 8 1 4 8). > > Any suggestions please? Please read Documentation/dynamic-debug-howto.txt ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies