m68k/sun3: Dynamically allocate the table to track IOMMU use (7b3e8de9) · Commits · e / devices / android_kernel_teracube_2e

As Sun 3 kernels cannot be multi-platform due to the different Sun 3 MMU type, it made sense to statically allocate the table to track IOMMU use. However, Sun 3x kernels can be multi-platform. Furthermore, Sun 3x uses a larger table than Sun 3 (8192 bytes instead of 512 bytes). Hence switch to dynamic allocation of this table using the bootmem allocator to avoid wasting 8192 bytes when not running on a Sun 3x. As this allocator returns zeroed memory, there's no need to explicitly initialize the table to zeroes. Signed-off-by:

Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/sun3/sun3dvma.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@
		* Contains common routines for sun3/sun3x DVMA management.
		*/

		#include <linux/bootmem.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/kernel.h>
		@@ -31,7 +32,7 @@ static inline void dvma_unmap_iommu(unsigned long a, int b)
		extern void sun3_dvma_init(void);
		#endif

		static unsigned long iommu_use[IOMMU_TOTAL_ENTRIES];
		static unsigned long *iommu_use;

		#define dvma_index(baddr) ((baddr - DVMA_START) >> DVMA_PAGE_SHIFT)

		@@ -266,7 +267,7 @@ void __init dvma_init(void)

		list_add(&(hole->list), &hole_list);

		memset(iommu_use, 0, sizeof(iommu_use));
		iommu_use = alloc_bootmem(IOMMU_TOTAL_ENTRIES * sizeof(unsigned long));

		dvma_unmap_iommu(DVMA_START, DVMA_SIZE);