linux-kernel - Re: [PATCH] gendwarfksyms: Fix build on 32-bit hosts

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Message-ID: <aRycVOe5ZXSJJFpn@kitsune.suse.cz>
Date: Tue, 18 Nov 2025 17:18:28 +0100
From: Michal Suchánek <msuchanek@...e.de>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: linux-modules@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Daniel Gomez <da.gomez@...nel.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gendwarfksyms: Fix build on 32-bit hosts

Hello,

On Mon, Nov 17, 2025 at 08:38:07PM +0000, Sami Tolvanen wrote:
> We have interchangeably used unsigned long for some of the types
> defined in elfutils, assuming they're always 64-bit. This obviously
> fails when building gendwarfksyms on 32-bit hosts. Fix the types.
> 
> Reported-by: Michal Suchánek <msuchanek@...e.de>
> Closes: https://lore.kernel.org/linux-modules/aRcxzPxtJblVSh1y@kitsune.suse.cz/
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> ---
>  scripts/gendwarfksyms/dwarf.c   | 4 +++-
>  scripts/gendwarfksyms/symbols.c | 5 +++--
>  2 files changed, 6 insertions(+), 3 deletions(-)

with this patch gendwarfksyms builds on 32bit x86 and Arm.

Tested-by: Michal Suchánek <msuchanek@...e.de>

Thanks

Michal

> 
> diff --git a/scripts/gendwarfksyms/dwarf.c b/scripts/gendwarfksyms/dwarf.c
> index 3538a7d9cb07..e76d732f5f60 100644
> --- a/scripts/gendwarfksyms/dwarf.c
> +++ b/scripts/gendwarfksyms/dwarf.c
> @@ -750,6 +750,7 @@ static void process_enumerator_type(struct state *state, struct die *cache,
>  				    Dwarf_Die *die)
>  {
>  	bool overridden = false;
> +	unsigned long override;
>  	Dwarf_Word value;
>  
>  	if (stable) {
> @@ -761,7 +762,8 @@ static void process_enumerator_type(struct state *state, struct die *cache,
>  			return;
>  
>  		overridden = kabi_get_enumerator_value(
> -			state->expand.current_fqn, cache->fqn, &value);
> +			state->expand.current_fqn, cache->fqn, &override);
> +		value = override;
>  	}
>  
>  	process_list_comma(state, cache);
> diff --git a/scripts/gendwarfksyms/symbols.c b/scripts/gendwarfksyms/symbols.c
> index ecddcb5ffcdf..42cd27c9cec4 100644
> --- a/scripts/gendwarfksyms/symbols.c
> +++ b/scripts/gendwarfksyms/symbols.c
> @@ -3,6 +3,7 @@
>   * Copyright (C) 2024 Google LLC
>   */
>  
> +#include <inttypes.h>
>  #include "gendwarfksyms.h"
>  
>  #define SYMBOL_HASH_BITS 12
> @@ -242,7 +243,7 @@ static void elf_for_each_global(int fd, elf_symbol_callback_t func, void *arg)
>  				error("elf_getdata failed: %s", elf_errmsg(-1));
>  
>  			if (shdr->sh_entsize != sym_size)
> -				error("expected sh_entsize (%lu) to be %zu",
> +				error("expected sh_entsize (%" PRIu64 ") to be %zu",
>  				      shdr->sh_entsize, sym_size);
>  
>  			nsyms = shdr->sh_size / shdr->sh_entsize;
> @@ -292,7 +293,7 @@ static void set_symbol_addr(struct symbol *sym, void *arg)
>  		hash_add(symbol_addrs, &sym->addr_hash,
>  			 symbol_addr_hash(&sym->addr));
>  
> -		debug("%s -> { %u, %lx }", sym->name, sym->addr.section,
> +		debug("%s -> { %u, %" PRIx64 " }", sym->name, sym->addr.section,
>  		      sym->addr.address);
>  	} else if (sym->addr.section != addr->section ||
>  		   sym->addr.address != addr->address) {
> 
> base-commit: 6a23ae0a96a600d1d12557add110e0bb6e32730c
> -- 
> 2.52.0.rc1.455.g30608eb744-goog
>