[PATCH v2 02/16] powerpc: override __ALIGN() and __ALIGN_STR() macros
Sathvika Vasireddy
sv at linux.vnet.ibm.com
Tue Aug 30 00:39:08 AEST 2022
Hi Christophe,
On 29/08/22 18:56, Christophe Leroy wrote:
>
> Le 29/08/2022 à 07:52, Sathvika Vasireddy a écrit :
>> Powerpc instructions must be word-aligned. Currently,
>> there is an alignment of 16 bytes (by default), and it is
>> much more than what is required for powerpc (4 bytes).
>>
>> The default expansion of __ALIGN() macro is:
>> #define __ALIGN .align 4,0x90
>>
>> Since Powerpc Linux does not require a 16 byte alignment,
>> override __ALIGN() and __ALIGN_STR() macros to use required
>> 4 byte alignment.
>>
>> Signed-off-by: Sathvika Vasireddy <sv at linux.ibm.com>
>> ---
>> arch/powerpc/include/asm/linkage.h | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/powerpc/include/asm/linkage.h b/arch/powerpc/include/asm/linkage.h
>> index b71b9582e754..8df88fe61438 100644
>> --- a/arch/powerpc/include/asm/linkage.h
>> +++ b/arch/powerpc/include/asm/linkage.h
>> @@ -2,8 +2,12 @@
>> #ifndef _ASM_POWERPC_LINKAGE_H
>> #define _ASM_POWERPC_LINKAGE_H
>>
>> +#include <linux/stringify.h>
>> #include <asm/types.h>
>>
>> +#define __ALIGN .align 2
>> +#define __ALIGN_STR __stringify(__ALIGN)
>> +
> I still can't see the added value of using __stringify() macro here. In
> order to use that macro you have to include linux/stringify.h . Usually
> we try to minimise the amount of headers required by other headers.
Oh ok, makes sense to me. I'll wait for a day to see if there are any
other comments, and make this change as part of v3.
Thanks for reviewing!
- Sathvika
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