linux-kernel - RE: [PATCH] efi: Fix warning of int-to-pointer-cast on x86 32-bit builds

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Message-ID: <E86EADE93E2D054CBCD4E708C38D364A54280C05@G01JPEXMBYT01>
Date:	Fri, 23 Oct 2015 00:39:00 +0000
From:	"Izumi, Taku" <izumi.taku@...fujitsu.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo.kernel.org@...il.com" <mingo.kernel.org@...il.com>,
	"matt.fleming@...el.com" <matt.fleming@...el.com>,
	"Kamezawa, Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: RE: [PATCH] efi: Fix warning of int-to-pointer-cast on x86 32-bit
 builds

Dear Ard,

> > commit-0f96a99 introduces the following warning message:
> >
> >  drivers/firmware/efi/fake_mem.c:186:20: warning: cast to pointer
> >  from integer of different size [-Wint-to-pointer-cast]
> >
> > new_memmap_phy was defined as a u64 value and casted to void*.
> > This causes a warning of int-to-pointer-cast on x86 32-bit
> > environment.
> >
> > This patch changes the type of "new_memmap_phy" variable
> > from "u64" into "phys_addr_t" to avoid it.
> 
> This assumes sizeof(void*) == sizeof(phys_addr_t), which is not always true, e.g., on 32-bit ARM (whose UEFI support is
> in development but not yet merged) with LPAE enabled.
> 
> Could we use unsigned long instead?

  Okay. I'll update my patch.

Sincerely,
Taku Izumi
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