linux-kernel - Re: [PATCH] scripts/gdb/symbols: follow up on refactoring for const struct bin

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Message-ID: <20250227001759.GA351718-mkhalfella@purestorage.com>
Date: Wed, 26 Feb 2025 16:17:59 -0800
From: Mohamed Khalfella <mkhalfella@...estorage.com>
To: Koichiro Den <koichiro.den@...onical.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Kieran Bingham <kbingham@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Etienne Buira <etienne.buira@...e.fr>,
	Andrew Ballance <andrewjballance@...il.com>
Cc: linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Weißschuh <linux@...ssschuh.net>
Subject: Re: [PATCH] scripts/gdb/symbols: follow up on refactoring for const
 struct bin_attribute

On 2025-02-12 20:38:06 -0800, Mohamed Khalfella wrote:
> On 2025-01-12 21:21:49 +0900, Koichiro Den wrote:
> > The work for 'const struct bin_attribute' [1] was merged into linux-next
> > but did not include updates to the lx-symbols code. So it now fails with
> > the following error:
> > Python Exception <class 'gdb.error'>: There is no member named nsections.
> > Error occurred in Python: There is no member named nsections.
> > 
> > Restore its functionality by aligning it with those changes on
> > kernel/module/sysfs.c.
> > 
> > [1] https://lore.kernel.org/all/20241227-sysfs-const-bin_attr-module-v2-0-e267275f0f37@weissschuh.net/
> > 
> > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> > ---
> >  scripts/gdb/linux/symbols.py | 16 +++++++++++++---
> >  1 file changed, 13 insertions(+), 3 deletions(-)
> > 
> > diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
> > index f6c1b063775a..8efefd30df49 100644
> > --- a/scripts/gdb/linux/symbols.py
> > +++ b/scripts/gdb/linux/symbols.py
> > @@ -89,16 +89,26 @@ lx-symbols command."""
> >                  return name
> >          return None
> >  
> > +    def _iter_bin_attrs(self, bin_attrs):
> > +        while True:
> > +            try:
> > +                bin_attr = bin_attrs.dereference()
> > +            except gdb.MemoryError:
> 
> This should not result in an exception. The array should at least have
> one element on it, that is the NULL terminator.
> 
> > +                break
> > +            if bin_attr == 0:
> > +                break
> > +            yield bin_attr
> > +            bin_attrs += 1
> > +
> >      def _section_arguments(self, module, module_addr):
> >          try:
> >              sect_attrs = module['sect_attrs'].dereference()
> >          except gdb.error:
> >              return str(module_addr)
> >  
> > -        attrs = sect_attrs['attrs']
> >          section_name_to_address = {
> > -            attrs[n]['battr']['attr']['name'].string(): attrs[n]['address']
> > -            for n in range(int(sect_attrs['nsections']))}
> > +            bin_attr['attr']['name'].string(): bin_attr['private']
> > +            for bin_attr in self._iter_bin_attrs(sect_attrs['grp']['bin_attrs'])}
> >  
> >          textaddr = section_name_to_address.get(".text", module_addr)
> >          args = []
> > -- 
> > 2.45.2
> > 
> 
> Hello Koichiro,
> 
> I hit the same problem came up with similar fix below. Of course I am
> biased and I think my change is more concise. Feel free to take from it.
> Looks like many commits changed this code and any of them would break
> python code. Can you please add Fixes tag at least to the top commit.
> 
> 34f5ec0f8252 ("module: sysfs: Drop 'struct module_sect_attr'")
> 4b2c11e4aaf7 ("module: sysfs: Drop member 'module_sect_attr::address'")
> d8959b947a8d ("module: sysfs: Drop member 'module_sect_attrs::nsections'")
> 
> diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
> index f6c1b063775a..e4865ec5aebe 100644
> --- a/scripts/gdb/linux/symbols.py
> +++ b/scripts/gdb/linux/symbols.py
> @@ -95,10 +95,15 @@ lx-symbols command."""
>          except gdb.error:
>              return str(module_addr)
> 
> -        attrs = sect_attrs['attrs']
> -        section_name_to_address = {
> -            attrs[n]['battr']['attr']['name'].string(): attrs[n]['address']
> -            for n in range(int(sect_attrs['nsections']))}
> +        section_name_to_address = {}
> +        gattr = sect_attrs['grp']['bin_attrs']
> +        battr = gattr.dereference()
> +        while battr:
> +            sec_name = battr['attr']['name'].string()
> +            sec_addr = battr['private']
> +            section_name_to_address[sec_name] = sec_addr
> +            gattr = gattr + 1
> +            battr = gattr.dereference()
> 
>          textaddr = section_name_to_address.get(".text", module_addr)
>          args = []

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