93026e217b
As noted by Akinobu Mita in patch b1fceac2b9,
alloc_bootmem and related functions never return NULL and always return a
zeroed region of memory. Thus a NULL test or memset after calls to these
functions is unnecessary.
This was fixed using the following semantic patch.
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@@
expression E;
statement S;
@@
E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...)
.. when != E
(
- BUG_ON (E == NULL);
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- if (E == NULL) S
)
@@
expression E,E1;
@@
E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...)
.. when != E
- memset(E,0,E1);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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* linux/arch/m68k/mm/sun3mmu.c
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*
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* Implementations of mm routines specific to the sun3 MMU.
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*
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* Moved here 8/20/1999 Sam Creasey
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*
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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extern void mmu_emu_init (unsigned long bootmem_end);
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const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
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extern unsigned long num_pages;
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void free_initmem(void)
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{
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}
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/* For the sun3 we try to follow the i386 paging_init() more closely */
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/* start_mem and end_mem have PAGE_OFFSET added already */
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/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
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void __init paging_init(void)
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{
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pgd_t * pg_dir;
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pte_t * pg_table;
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int i;
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unsigned long address;
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unsigned long next_pgtable;
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unsigned long bootmem_end;
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unsigned long zones_size[MAX_NR_ZONES] = { 0, };
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unsigned long size;
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#ifdef TEST_VERIFY_AREA
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wp_works_ok = 0;
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#endif
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empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
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address = PAGE_OFFSET;
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pg_dir = swapper_pg_dir;
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memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
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memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
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size = num_pages * sizeof(pte_t);
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size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
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next_pgtable = (unsigned long)alloc_bootmem_pages(size);
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bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
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/* Map whole memory from PAGE_OFFSET (0x0E000000) */
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pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
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while (address < (unsigned long)high_memory) {
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pg_table = (pte_t *) __pa (next_pgtable);
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next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
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pgd_val(*pg_dir) = (unsigned long) pg_table;
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pg_dir++;
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/* now change pg_table to kernel virtual addresses */
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pg_table = (pte_t *) __va ((unsigned long) pg_table);
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for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
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pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
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if (address >= (unsigned long)high_memory)
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pte_val (pte) = 0;
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set_pte (pg_table, pte);
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address += PAGE_SIZE;
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}
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}
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mmu_emu_init(bootmem_end);
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current->mm = NULL;
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/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
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zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
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/* I really wish I knew why the following change made things better... -- Sam */
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/* free_area_init(zones_size); */
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free_area_init_node(0, NODE_DATA(0), zones_size,
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(__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);
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}
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