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ARM/keystone: move the DMA offset handling under ifdef CONFIG_ARM_LPAE

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The DMA offset notifier can only be used if PHYS_OFFSET is at least
KEYSTONE_HIGH_PHYS_START, which can't be represented by a 32-bit
phys_addr_t.  Currently the code compiles fine despite that, a pending
change to the DMA offset handling would create a compiler warning for
this case.  Add an ifdef to not compile the code except for LPAE
configs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2020-09-08 19:24:00 +02:00
parent 3799e402a4
commit cf141ae989
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mach-keystone/keystone.c
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@ -24,6 +24,7 @@
#include "keystone.h"
#ifdef CONFIG_ARM_LPAE
static unsigned long keystone_dma_pfn_offset __read_mostly;
static int keystone_platform_notifier(struct notifier_block *nb,
@ -48,14 +49,17 @@ static int keystone_platform_notifier(struct notifier_block *nb,
static struct notifier_block platform_nb = {
.notifier_call = keystone_platform_notifier,
};
#endif /* CONFIG_ARM_LPAE */
static void __init keystone_init(void)
{
#ifdef CONFIG_ARM_LPAE
if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
KEYSTONE_LOW_PHYS_START);
bus_register_notifier(&platform_bus_type, &platform_nb);
}
#endif
keystone_pm_runtime_init();
}