linux-kernel - Re: [PATCH 1/2] Fix a build warning in scripts/sortextable.h

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Date:	Wed, 03 Jul 2013 14:07:47 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Daniel Tang <dt.tangr@...il.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 1/2] Fix a build warning in scripts/sortextable.h

On 3.7.2013 14:06, Michal Marek wrote:
> Added David Daney to CC.

Second attempt, sorry.


> On 9.6.2013 04:33, Daniel Tang wrote:
>> The pointer passed to the _r() macro does not always match the type
>> of the function that it is aliasing and raises several of the following
>> warnings at compile time:
>>
>> warning: passing argument 1 of ‘r8’ from incompatible pointer type
> 
> In what environment (arch, compiler, glibc) are you seeing this?
> 
> Michal
> 
>> Fixed by casting the pointers to (void *) so they work with both the
>> 32bit and 64bit code.
>>
>> Signed-off-by: Daniel Tang <dt.tangr@...il.com>
>> ---
>>  scripts/sortextable.h | 29 +++++++++++++++--------------
>>  1 file changed, 15 insertions(+), 14 deletions(-)
>>
>> diff --git a/scripts/sortextable.h b/scripts/sortextable.h
>> index f5eb43d..0a38fbd 100644
>> --- a/scripts/sortextable.h
>> +++ b/scripts/sortextable.h
>> @@ -110,9 +110,9 @@ do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
>>  	int i;
>>  	int idx;
>>  
>> -	shdr = (Elf_Shdr *)((char *)ehdr + _r(&ehdr->e_shoff));
>> +	shdr = (Elf_Shdr *)((char *)ehdr + _r((void *)&ehdr->e_shoff));
>>  	shstrtab_sec = shdr + r2(&ehdr->e_shstrndx);
>> -	secstrtab = (const char *)ehdr + _r(&shstrtab_sec->sh_offset);
>> +	secstrtab = (const char *)ehdr + _r((void *)&shstrtab_sec->sh_offset);
>>  	for (i = 0; i < r2(&ehdr->e_shnum); i++) {
>>  		idx = r(&shdr[i].sh_name);
>>  		if (strcmp(secstrtab + idx, "__ex_table") == 0) {
>> @@ -122,8 +122,8 @@ do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
>>  		if ((r(&shdr[i].sh_type) == SHT_REL ||
>>  		     r(&shdr[i].sh_type) == SHT_RELA) &&
>>  		    r(&shdr[i].sh_info) == extab_index) {
>> -			relocs = (void *)ehdr + _r(&shdr[i].sh_offset);
>> -			relocs_size = _r(&shdr[i].sh_size);
>> +			relocs = (void *)ehdr + _r((void *)&shdr[i].sh_offset);
>> +			relocs_size = _r((void *)&shdr[i].sh_size);
>>  		}
>>  		if (strcmp(secstrtab + idx, ".symtab") == 0)
>>  			symtab_sec = shdr + i;
>> @@ -142,14 +142,14 @@ do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
>>  		fprintf(stderr,	"no __ex_table in  file: %s\n", fname);
>>  		fail_file();
>>  	}
>> -	strtab = (const char *)ehdr + _r(&strtab_sec->sh_offset);
>> +	strtab = (const char *)ehdr + _r((void *)&strtab_sec->sh_offset);
>>  
>> -	extab_image = (void *)ehdr + _r(&extab_sec->sh_offset);
>> +	extab_image = (void *)ehdr + _r((void *)&extab_sec->sh_offset);
>>  
>>  	if (custom_sort) {
>> -		custom_sort(extab_image, _r(&extab_sec->sh_size));
>> +		custom_sort(extab_image, _r((void *)&extab_sec->sh_size));
>>  	} else {
>> -		int num_entries = _r(&extab_sec->sh_size) / extable_ent_size;
>> +		int num_entries = _r((void *)&extab_sec->sh_size) / extable_ent_size;
>>  		qsort(extab_image, num_entries,
>>  		      extable_ent_size, compare_extable);
>>  	}
>> @@ -159,12 +159,13 @@ do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
>>  
>>  	/* find main_extable_sort_needed */
>>  	sort_needed_sym = NULL;
>> -	for (i = 0; i < _r(&symtab_sec->sh_size) / sizeof(Elf_Sym); i++) {
>> -		sym = (void *)ehdr + _r(&symtab_sec->sh_offset);
>> +	for (i = 0; i < _r((void *)&symtab_sec->sh_size) / sizeof(Elf_Sym); i++)
>> +	{
>> +		sym = (void *)ehdr + _r((void *)&symtab_sec->sh_offset);
>>  		sym += i;
>>  		if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
>>  			continue;
>> -		idx = r(&sym->st_name);
>> +		idx = r((void *)&sym->st_name);
>>  		if (strcmp(strtab + idx, "main_extable_sort_needed") == 0) {
>>  			sort_needed_sym = sym;
>>  			break;
>> @@ -178,9 +179,9 @@ do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
>>  	}
>>  	sort_needed_sec = &shdr[r2(&sort_needed_sym->st_shndx)];
>>  	sort_done_location = (void *)ehdr +
>> -		_r(&sort_needed_sec->sh_offset) +
>> -		_r(&sort_needed_sym->st_value) -
>> -		_r(&sort_needed_sec->sh_addr);
>> +		_r((void *)&sort_needed_sec->sh_offset) +
>> +		_r((void *)&sort_needed_sym->st_value) -
>> +		_r((void *)&sort_needed_sec->sh_addr);
>>  
>>  #if 0
>>  	printf("sort done marker at %lx\n",
>>
> 
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