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[POWERPC] Size swapper_pg_dir correctly

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David Gibson pointed out that swapper_pg_dir actually need to be
PGD_TABLE_SIZE bytes long not PAGE_SIZE.  This actually saves 64k in
the bss for a kernel ppc64_defconfig built with CONFIG_PPC_64K_PAGES.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Stephen Rothwell 2007-09-18 17:22:59 +10:00 committed by Paul Mackerras
parent 19a8d97d89
commit ee7a76da1e
4 changed files with 9 additions and 1 deletions
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4
arch/powerpc/kernel/asm-offsets.c
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@ -320,5 +320,9 @@ int main(void)
DEFINE(VMALLOC_START_ESID, GET_ESID(VMALLOC_START));
DEFINE(VMALLOC_START_VSID, KERNEL_VSID(VMALLOC_START));
#endif
#ifdef CONFIG_PPC64
DEFINE(PGD_TABLE_SIZE, PGD_TABLE_SIZE);
#endif
return 0;
}

2
arch/powerpc/kernel/head_64.S
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@ -1539,4 +1539,4 @@ empty_zero_page:
.globl swapper_pg_dir
swapper_pg_dir:
.space PAGE_SIZE
.space PGD_TABLE_SIZE

2
include/asm-powerpc/pgtable-4k.h
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@ -10,10 +10,12 @@
#define PUD_INDEX_SIZE 7
#define PGD_INDEX_SIZE 9
#ifndef __ASSEMBLY__
#define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
#define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
#define PUD_TABLE_SIZE (sizeof(pud_t) << PUD_INDEX_SIZE)
#define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
#endif /* __ASSEMBLY__ */
#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
#define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)

2
include/asm-powerpc/pgtable-64k.h
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@ -9,9 +9,11 @@
#define PUD_INDEX_SIZE 0
#define PGD_INDEX_SIZE 4
#ifndef __ASSEMBLY__
#define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE)
#define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
#define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
#endif /* __ASSEMBLY__ */
#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
#define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)