From: Catalin Marinas <catalin.marinas@arm.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
Stephen Boyd <sboyd@codeaurora.org>,
Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 15/20] ARM: LPAE: use phys_addr_t instead of unsigned long for physical addresses
Date: Wed, 17 Nov 2010 15:28:33 +0000 [thread overview]
Message-ID: <AANLkTik39iqXsLJiJ7cWwweO2VBoJ0Y4ymwKqx7X5ziA@mail.gmail.com> (raw)
In-Reply-To: <201011171218.13910.arnd@arndb.de>
On 17 November 2010 11:18, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wednesday 17 November 2010, Catalin Marinas wrote:
>> >
>> > It may make sense to mark it const volatile, as that's the most
>> > permissive set of attributes possible (iow, it'll accept any pointer
>> > without warning.) However, might be an idea to check what other
>> > arches do.
>>
>> The majority of architectures use volatile and a few add both const
>> and volatile.
>>
>> I usually use the generic headers as reference for function prototypes
>> and that's just using volatile without a const (cc'ing Arnd for any
>> view on this).
>
> const volatile sounds right here, I can also change the generic header
> if we agree to do the same in arm.
That's what I plan to add, though it may be better to push as a
separate patch to fix compiler warnings now. I don't know when the
LPAE patches would go in.
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -189,7 +189,7 @@
* translation for translating DMA addresses. Use the driver
* DMA support - see dma-mapping.h.
*/
-static inline phys_addr_t virt_to_phys(void *x)
+static inline phys_addr_t virt_to_phys(const volatile void *x)
{
return __virt_to_phys((unsigned long)(x));
}
--
Catalin
next prev parent reply other threads:[~2010-11-17 15:28 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-15 17:40 [PATCH v3 00/20] ARM: Add support for the Large Physical Address Extensions Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 01/20] ARM: LPAE: Use PMD_(SHIFT|SIZE|MASK) instead of PGDIR_* Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 02/20] ARM: LPAE: Factor out 2-level page table definitions into separate files Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 03/20] ARM: LPAE: use long long format when printing physical addresses and ptes Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 04/20] ARM: LPAE: use u32 instead of unsigned long for 32-bit ptes Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 05/20] ARM: LPAE: Do not assume Linux PTEs are always at PTRS_PER_PTE offset Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 06/20] ARM: LPAE: Introduce L_PTE_NOEXEC and L_PTE_NOWRITE Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 07/20] ARM: LPAE: Introduce the 3-level page table format definitions Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 08/20] ARM: LPAE: Page table maintenance for the 3-level format Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 09/20] ARM: LPAE: MMU setup for the 3-level page table format Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 10/20] ARM: LPAE: Change setup_mm_for_reboot() to work with LPAE Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 11/20] ARM: LPAE: Remove the FIRST_USER_PGD_NR and USER_PTRS_PER_PGD definitions Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 12/20] ARM: LPAE: Add fault handling support Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 13/20] ARM: LPAE: Add context switching support Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 14/20] ARM: LPAE: Add SMP support for the 3-level page table format Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 15/20] ARM: LPAE: use phys_addr_t instead of unsigned long for physical addresses Catalin Marinas
2010-11-16 19:14 ` Stephen Boyd
2010-11-16 19:33 ` Russell King - ARM Linux
2010-11-17 10:47 ` Catalin Marinas
2010-11-17 11:18 ` Arnd Bergmann
2010-11-17 15:28 ` Catalin Marinas [this message]
2010-11-17 15:40 ` Arnd Bergmann
2010-11-15 17:40 ` [PATCH v3 16/20] ARM: LPAE: Use generic dma_addr_t type definition Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 17/20] ARM: LPAE: mark memory banks with start > ULONG_MAX as highmem Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 18/20] ARM: LPAE: use phys_addr_t for physical start address in early_mem Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 19/20] ARM: LPAE: add support for ATAG_MEM64 Catalin Marinas
2010-11-15 17:40 ` [PATCH v3 20/20] ARM: LPAE: Add the Kconfig entries Catalin Marinas
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