| Message ID | 20240312170309.2546362-12-linux@roeck-us.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for suppressing warning backtraces | expand |
Hi Günter, On Tue, Mar 12, 2024 at 6:06 PM Guenter Roeck <linux@roeck-us.net> wrote: > Add name of functions triggering warning backtraces to the __bug_table > object section to enable support for suppressing WARNING backtraces. > > To limit image size impact, the pointer to the function name is only added > to the __bug_table section if both CONFIG_KUNIT and CONFIG_DEBUG_BUGVERBOSE > are enabled. Otherwise, the __func__ assembly parameter is replaced with a > (dummy) NULL parameter to avoid an image size increase due to unused > __func__ entries (this is necessary because __func__ is not a define but a > virtual variable). > > Signed-off-by: Guenter Roeck <linux@roeck-us.net> Thanks for your patch! > --- a/arch/s390/include/asm/bug.h > +++ b/arch/s390/include/asm/bug.h > @@ -8,19 +8,30 @@ > > #ifdef CONFIG_DEBUG_BUGVERBOSE > > +#if IS_ENABLED(CONFIG_KUNIT) > +# define HAVE_BUG_FUNCTION > +# define __BUG_FUNC_PTR " .long %0-.\n" > +# define __BUG_FUNC __func__ > +#else > +# define __BUG_FUNC_PTR > +# define __BUG_FUNC NULL > +#endif /* IS_ENABLED(CONFIG_KUNIT) */ > + > #define __EMIT_BUG(x) do { \ > asm_inline volatile( \ > "0: mc 0,0\n" \ > ".section .rodata.str,\"aMS\",@progbits,1\n" \ > "1: .asciz \""__FILE__"\"\n" \ > ".previous\n" \ > - ".section __bug_table,\"awM\",@progbits,%2\n" \ > + ".section __bug_table,\"awM\",@progbits,%3\n" \ This change conflicts with commit 3938490e78f443fb ("s390/bug: remove entry size from __bug_table section") in linus/master. I guess it should just be dropped? > "2: .long 0b-.\n" \ > " .long 1b-.\n" \ > - " .short %0,%1\n" \ > - " .org 2b+%2\n" \ > + __BUG_FUNC_PTR \ > + " .short %1,%2\n" \ > + " .org 2b+%3\n" \ > ".previous\n" \ > - : : "i" (__LINE__), \ > + : : "i" (__BUG_FUNC), \ > + "i" (__LINE__), \ > "i" (x), \ > "i" (sizeof(struct bug_entry))); \ > } while (0) Gr{oetje,eeting}s, Geert
On 3/14/24 00:57, Geert Uytterhoeven wrote: > Hi Günter, > > On Tue, Mar 12, 2024 at 6:06 PM Guenter Roeck <linux@roeck-us.net> wrote: >> Add name of functions triggering warning backtraces to the __bug_table >> object section to enable support for suppressing WARNING backtraces. >> >> To limit image size impact, the pointer to the function name is only added >> to the __bug_table section if both CONFIG_KUNIT and CONFIG_DEBUG_BUGVERBOSE >> are enabled. Otherwise, the __func__ assembly parameter is replaced with a >> (dummy) NULL parameter to avoid an image size increase due to unused >> __func__ entries (this is necessary because __func__ is not a define but a >> virtual variable). >> >> Signed-off-by: Guenter Roeck <linux@roeck-us.net> > > Thanks for your patch! > >> --- a/arch/s390/include/asm/bug.h >> +++ b/arch/s390/include/asm/bug.h >> @@ -8,19 +8,30 @@ >> >> #ifdef CONFIG_DEBUG_BUGVERBOSE >> >> +#if IS_ENABLED(CONFIG_KUNIT) >> +# define HAVE_BUG_FUNCTION >> +# define __BUG_FUNC_PTR " .long %0-.\n" >> +# define __BUG_FUNC __func__ >> +#else >> +# define __BUG_FUNC_PTR >> +# define __BUG_FUNC NULL >> +#endif /* IS_ENABLED(CONFIG_KUNIT) */ >> + >> #define __EMIT_BUG(x) do { \ >> asm_inline volatile( \ >> "0: mc 0,0\n" \ >> ".section .rodata.str,\"aMS\",@progbits,1\n" \ >> "1: .asciz \""__FILE__"\"\n" \ >> ".previous\n" \ >> - ".section __bug_table,\"awM\",@progbits,%2\n" \ >> + ".section __bug_table,\"awM\",@progbits,%3\n" \ > > This change conflicts with commit 3938490e78f443fb ("s390/bug: > remove entry size from __bug_table section") in linus/master. > I guess it should just be dropped? > Yes, I know. I'll send v2 rebased to v6.9-rc1 once it is available and, yes, the change will be gone after that. Thanks, Guenter
diff --git a/arch/s390/include/asm/bug.h b/arch/s390/include/asm/bug.h index aebe1e22c7be..01e2aa4069d7 100644 --- a/arch/s390/include/asm/bug.h +++ b/arch/s390/include/asm/bug.h @@ -8,19 +8,30 @@ #ifdef CONFIG_DEBUG_BUGVERBOSE +#if IS_ENABLED(CONFIG_KUNIT) +# define HAVE_BUG_FUNCTION +# define __BUG_FUNC_PTR " .long %0-.\n" +# define __BUG_FUNC __func__ +#else +# define __BUG_FUNC_PTR +# define __BUG_FUNC NULL +#endif /* IS_ENABLED(CONFIG_KUNIT) */ + #define __EMIT_BUG(x) do { \ asm_inline volatile( \ "0: mc 0,0\n" \ ".section .rodata.str,\"aMS\",@progbits,1\n" \ "1: .asciz \""__FILE__"\"\n" \ ".previous\n" \ - ".section __bug_table,\"awM\",@progbits,%2\n" \ + ".section __bug_table,\"awM\",@progbits,%3\n" \ "2: .long 0b-.\n" \ " .long 1b-.\n" \ - " .short %0,%1\n" \ - " .org 2b+%2\n" \ + __BUG_FUNC_PTR \ + " .short %1,%2\n" \ + " .org 2b+%3\n" \ ".previous\n" \ - : : "i" (__LINE__), \ + : : "i" (__BUG_FUNC), \ + "i" (__LINE__), \ "i" (x), \ "i" (sizeof(struct bug_entry))); \ } while (0)
Add name of functions triggering warning backtraces to the __bug_table object section to enable support for suppressing WARNING backtraces. To limit image size impact, the pointer to the function name is only added to the __bug_table section if both CONFIG_KUNIT and CONFIG_DEBUG_BUGVERBOSE are enabled. Otherwise, the __func__ assembly parameter is replaced with a (dummy) NULL parameter to avoid an image size increase due to unused __func__ entries (this is necessary because __func__ is not a define but a virtual variable). Signed-off-by: Guenter Roeck <linux@roeck-us.net> --- arch/s390/include/asm/bug.h | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)