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Re: [PATCH v5 01/30] regset: Add support for dynamically sized regsets
- From: Alex Bennée <alex dot bennee at linaro dot org>
- To: Dave Martin <Dave dot Martin at arm dot com>
- Cc: Catalin Marinas <catalin dot marinas at arm dot com>, linux-arch at vger dot kernel dot org, "H. J. Lu" <hjl dot tools at gmail dot com>, Okamoto Takayuki <tokamoto at jp dot fujitsu dot com>, libc-alpha at sourceware dot org, Ard Biesheuvel <ard dot biesheuvel at linaro dot org>, Szabolcs Nagy <szabolcs dot nagy at arm dot com>, Dmitry Safonov <dsafonov at virtuozzo dot com>, Will Deacon <will dot deacon at arm dot com>, Oleg Nesterov <oleg at redhat dot com>, Ingo Molnar <mingo at redhat dot com>, Alexander Viro <viro at zeniv dot linux dot org dot uk>, "H. Peter Anvin" <hpa at zytor dot com>, Thomas Gleixner <tglx at linutronix dot de>, kvmarm at lists dot cs dot columbia dot edu, linux-arm-kernel at lists dot infradead dot org
- Date: Wed, 08 Nov 2017 11:50:00 +0000
- Subject: Re: [PATCH v5 01/30] regset: Add support for dynamically sized regsets
- Authentication-results: sourceware.org; auth=none
- References: <1509465082-30427-1-git-send-email-Dave.Martin@arm.com> <1509465082-30427-2-git-send-email-Dave.Martin@arm.com> <20171101114228.jm53aj7jx6j4mxhn@armageddon.cambridge.arm.com> <20171101131644.GL19485@e103592.cambridge.arm.com>
Dave Martin <Dave.Martin@arm.com> writes:
> On Wed, Nov 01, 2017 at 11:42:29AM +0000, Catalin Marinas wrote:
>> On Tue, Oct 31, 2017 at 03:50:53PM +0000, Dave P Martin wrote:
>> > Currently the regset API doesn't allow for the possibility that
>> > regsets (or at least, the amount of meaningful data in a regset)
>> > may change in size.
>> >
>> > In particular, this results in useless padding being added to
>> > coredumps if a regset's current size is smaller than its
>> > theoretical maximum size.
>> >
>> > This patch adds a get_size() function to struct user_regset.
>> > Individual regset implementations can implement this function to
>> > return the current size of the regset data. A regset_size()
>> > function is added to provide callers with an abstract interface for
>> > determining the size of a regset without needing to know whether
>> > the regset is dynamically sized or not.
>> >
>> > The only affected user of this interface is the ELF coredump code:
>> > This patch ports ELF coredump to dump regsets with their actual
>> > size in the coredump. This has no effect except for new regsets
>> > that are dynamically sized and provide a get_size() implementation.
>> >
>> > Signed-off-by: Dave Martin <Dave.Martin@arm.com>
>> > Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
>> > Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
>> > Cc: Oleg Nesterov <oleg@redhat.com>
>> > Cc: Alexander Viro <viro@zeniv.linux.org.uk>
>> > Cc: Thomas Gleixner <tglx@linutronix.de>
>> > Cc: Ingo Molnar <mingo@redhat.com>
>> > Cc: "H. Peter Anvin" <hpa@zytor.com>
>> > Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
>> > Cc: H. J. Lu <hjl.tools@gmail.com>
>> >
>> > ---
>> >
>> > **Dropped** Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
>> > **Dropped** Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
>> > (due to bug fix applied against v4 of this patch.)
>>
>> It seems that the Reviewed-by tags are still there ;). Anyway, on the
>
> Oops, looks like that only happened on this patch. I've removed
> Alex's R-b from my own version in case of repost -- can you also
> do the same?
>
>> new patch:
>>
>> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
You can have my:
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
>
> Cheers
> ---Dave
--
Alex Bennée