From: Stefano Stabellini <sstabellini@kernel.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Russell King <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org, Ian Abbott <abbotti@mev.co.uk>,
xen-devel@lists.xenproject.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] xen: avoid type warning in xchg_xen_ulong
Date: Thu, 8 Jun 2017 11:12:02 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.10.1706081110190.26108__2942.85464701733$1496945576$gmane$org@sstabellini-ThinkPad-X260> (raw)
In-Reply-To: <20170608085323.2209174-1-arnd@arndb.de>
On Thu, 8 Jun 2017, Arnd Bergmann wrote:
> The improved type-checking version of container_of() triggers a warning for
> xchg_xen_ulong, pointing out that 'xen_ulong_t' is unsigned, but atomic64_t
> contains a signed value:
>
> drivers/xen/events/events_2l.c: In function 'evtchn_2l_handle_events':
> drivers/xen/events/events_2l.c:187:1020: error: call to '__compiletime_assert_187' declared with attribute error: pointer type mismatch in container_of()
>
> This adds a cast to work around the warning.
>
> Cc: Ian Abbott <abbotti@mev.co.uk>
> Fixes: 85323a991d40 ("xen: arm: mandate EABI and use generic atomic operations.")
> Fixes: daa2ac80834d ("kernel.h: handle pointers to arrays better in container_of()")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
I'll queue it up on xentip for Linux 4.13.
> ---
> v2: found the correct warning message and updated the changelog
> ---
> arch/arm/include/asm/xen/events.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
> index 71e473d05fcc..620dc75362e5 100644
> --- a/arch/arm/include/asm/xen/events.h
> +++ b/arch/arm/include/asm/xen/events.h
> @@ -16,7 +16,7 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
> return raw_irqs_disabled_flags(regs->ARM_cpsr);
> }
>
> -#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((ptr), \
> +#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((long long*)(ptr),\
> atomic64_t, \
> counter), (val))
>
> --
> 2.9.0
>
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
next prev parent reply other threads:[~2017-06-08 18:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170608085323.2209174-1-arnd@arndb.de>
2017-06-08 11:36 ` [PATCH v2] xen: avoid type warning in xchg_xen_ulong Ian Abbott
2017-06-08 18:12 ` Stefano Stabellini [this message]
2017-06-08 8:53 Arnd Bergmann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='alpine.DEB.2.10.1706081110190.26108__2942.85464701733$1496945576$gmane$org@sstabellini-ThinkPad-X260' \
--to=sstabellini@kernel.org \
--cc=abbotti@mev.co.uk \
--cc=arnd@arndb.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).