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SubjectRe: [PATCH 1/2] Move the pt_regs_offset struct definition from arch to common include file
On 06/16/15 09:17, Rob Herring wrote:
> On Mon, Jun 15, 2015 at 11:42 AM, David Long <dave.long@linaro.org> wrote:
>> From: "David A. Long" <dave.long@linaro.org>
>>
>> The pt_regs_offset structure is used for HAVE_REGS_AND_STACK_ACCESS_API
>> feature and has identical definitions in four different arch ptrace.h
>> include files. It seems unlikely that definition would ever need to be
>> changed regardless of architecture so lets move it into
>> include/linux/ptrace.h.
>>
>> Signed-off-by: David A. Long <dave.long@linaro.org>
>> ---
>> arch/arm/kernel/ptrace.c | 5 -----
>> arch/powerpc/kernel/ptrace.c | 5 -----
>> arch/sh/include/asm/ptrace.h | 5 -----
>> arch/x86/kernel/ptrace.c | 5 -----
>> include/linux/ptrace.h | 9 +++++++++
>> 5 files changed, 9 insertions(+), 20 deletions(-)
>>
>> diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
>> index ef9119f..fb45cf1 100644
>> --- a/arch/arm/kernel/ptrace.c
>> +++ b/arch/arm/kernel/ptrace.c
>> @@ -59,11 +59,6 @@
>> #define BREAKINST_THUMB 0xde01
>> #endif
>>
>> -struct pt_regs_offset {
>> - const char *name;
>> - int offset;
>> -};
>> -
>> #define REG_OFFSET_NAME(r) \
>> {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
>> #define REG_OFFSET_END {.name = NULL, .offset = 0}
>
> Can't you also move these? ARM is complicated with the "ARM_"
> prefixing, but the others appear to be the same. Maybe you can remove
> the prefix or redefine the macro for ARM.
>
> Rob
>

That would mandate that all the architecture-specific pt_regs structures
would have to use a top-level named field for each named register. That
seems to me like an unnecessary restriction when the point of
regs_offset_table is to provide the offset of the register inside an
arbitarily complex pt_regs struct. The often redundant definition of
these two macros doesn't seem to me that high a price for that.

-dl



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