linux-kernel - [PATCH 2/2] efi: Fix warning of int-to-pointer-cast on x86 32-bit builds

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Message-Id: <1445593697-1342-2-git-send-email-ard.biesheuvel@linaro.org>
Date:	Fri, 23 Oct 2015 11:48:17 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	linux-efi@...r.kernel.org, izumi.taku@...fujitsu.com,
	matt.fleming@...el.com, linux-kernel@...r.kernel.org,
	mingo@...nel.org
Cc:	kamezawa.hiroyu@...fujitsu.com,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH 2/2] efi: Fix warning of int-to-pointer-cast on x86 32-bit builds

From: Taku Izumi <izumi.taku@...fujitsu.com>

Commit 0f96a99dab36 ("efi: Add "efi_fake_mem" boot option")
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 cast to void*, causing
a int-to-pointer-cast warning on x86 32-bit builds.
However, since the void* type is inappropriate for a physical
address, the definition of struct efi_memory_map::phys_map has been
changed to phys_addr_t in the previous patch, and so the cast can be
dropped entirely.

This patch also changes the type of the "new_memmap_phy" variable
from "u64" to "phys_addr_t" to align with the types of
memblock_alloc() and struct efi_memory_map::phys_map.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Taku Izumi <izumi.taku@...fujitsu.com>
[ard.biesheuvel: removed void* cast, updated commit log]
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 drivers/firmware/efi/fake_mem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c
index 32bcb14df2c8..ed3a854950cc 100644
--- a/drivers/firmware/efi/fake_mem.c
+++ b/drivers/firmware/efi/fake_mem.c
@@ -59,7 +59,7 @@ void __init efi_fake_memmap(void)
 	u64 start, end, m_start, m_end, m_attr;
 	int new_nr_map = memmap.nr_map;
 	efi_memory_desc_t *md;
-	u64 new_memmap_phy;
+	phys_addr_t new_memmap_phy;
 	void *new_memmap;
 	void *old, *new;
 	int i;
@@ -183,7 +183,7 @@ void __init efi_fake_memmap(void)
 	/* swap into new EFI memmap */
 	efi_unmap_memmap();
 	memmap.map = new_memmap;
-	memmap.phys_map = (void *)new_memmap_phy;
+	memmap.phys_map = new_memmap_phy;
 	memmap.nr_map = new_nr_map;
 	memmap.map_end = memmap.map + memmap.nr_map * memmap.desc_size;
 	set_bit(EFI_MEMMAP, &efi.flags);
-- 
2.1.4

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