Re: [PATCH v7 08/13] lib/vsprintf: Remove support for %pF and %pf in favour of %pS and %ps

Sakari Ailus
2019-10-02T12:06:46Z

Hi Petr,

Thank you for the review.

On Tue, Sep 24, 2019 at 12:38:29PM +0200, Petr Mladek wrote:
> On Wed 2019-09-18 16:34:14, Sakari Ailus wrote:
> > %pS and %ps are now the preferred conversion specifiers to print function
> > names. The functionality is equivalent; remove the old, deprecated %pF
> > and %pf support.
> >
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -909,7 +909,7 @@ char *symbol_string(char *buf, char *end, void *ptr,
> > #ifdef CONFIG_KALLSYMS
> > if (*fmt == 'B')
> > sprint_backtrace(sym, value);
> > - else if (*fmt != 'f' && *fmt != 's')
> > + else if (*fmt != 's')
> > sprint_symbol(sym, value);
> > else
> > sprint_symbol_no_offset(sym, value);
> > @@ -2007,9 +2007,7 @@ static char *kobject_string(char *buf, char *end, void *ptr,
> > *
> > * - 'S' For symbolic direct pointers (or function descriptors) with offset
> > * - 's' For symbolic direct pointers (or function descriptors) without offset
> > - * - 'F' Same as 'S'
> > - * - 'f' Same as 's'
> > - * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
> > + * - '[Ss]R' as above with __builtin_extract_return_addr() translation
> > * - 'B' For backtraced symbolic direct pointers with offset
> > * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
> > * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
> > @@ -2112,8 +2110,6 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
> > struct printf_spec spec)
> > {
> > switch (*fmt) {
> > - case 'F':
> > - case 'f':
> > case 'S':
> > case 's':
> > ptr = dereference_symbol_descriptor(ptr);
>
> IMHO, we should do the same also in vbin_printf().
>
> The compatibility with traceevent tools was discussed in the thread
> https://lkml.kernel.org/r/20190910084707.18380-2-sakari.ailus@linux.intel.com
>
> If I understand it correctly the tools should be able to handle stored
> 'f' and 'F' modifiers because they might be produced by
> older kernels. But new kernels should not longer produce them.

Agreed.

>
> Otherwise the patch looks good to me. I am getting used to the fact
> that we will remove the obsolete specifiers completely.

I'll address this in v8 soon.

--
Regards,

Sakari Ailus
sakari.ailus@linux.intel.com