linux-kernel - Re: [PATCH v2] s390/mm: Make virt_to

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Date:   Tue, 15 Aug 2023 10:09:11 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        kasan-dev@...glegroups.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] s390/mm: Make virt_to_pfn() a static inline

On Sat, Aug 12, 2023 at 05:12:54PM +0200, Linus Walleij wrote:
> Making virt_to_pfn() a static inline taking a strongly typed
> (const void *) makes the contract of a passing a pointer of that
> type to the function explicit and exposes any misuse of the
> macro virt_to_pfn() acting polymorphic and accepting many types
> such as (void *), (unitptr_t) or (unsigned long) as arguments
> without warnings.
> 
> For symmetry do the same with pfn_to_virt() reflecting the
> current layout in asm-generic/page.h.
> 
> Doing this reveals a number of offenders in the arch code and
> the S390-specific drivers, so just bite the bullet and fix up
> all of those as well.
> 
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> Changes in v2:
> - Just drop the cast to (unsigned long) in drivers/s390/char/vmcp.c,
>   we do not need to cast to (void *) from (char *), a pointer is
>   a pointer.
> - Link to v1: https://lore.kernel.org/r/20230811-virt-to-phys-s390-v1-1-b661426ca9cd@linaro.org
> ---
>  arch/s390/include/asm/kfence.h |  2 +-
>  arch/s390/include/asm/page.h   | 12 ++++++++++--
>  arch/s390/mm/cmm.c             |  2 +-
>  arch/s390/mm/vmem.c            |  2 +-
>  drivers/s390/block/scm_blk.c   |  2 +-
>  drivers/s390/char/vmcp.c       |  2 +-
>  6 files changed, 15 insertions(+), 7 deletions(-)

Applied, thanks!