Messages in this thread Patch in this message | | | Date | Mon, 27 Dec 2010 16:48:32 -0800 | From | Yinghai Lu <> | Subject | [PATCH 5/6] x86, 64bit: Move out cleanup higmap [_brk_end, _end) out of init_memory_mapping() |
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It is not related to init_memory_mapping(), and init_memory_mapping() is getting more bigger.
So make it as seperated function and call it from reserve_brk() and that is point when _brk_end is concluded.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
--- arch/x86/kernel/setup.c | 24 ++++++++++++++++++++++++ arch/x86/mm/init.c | 19 ------------------- 2 files changed, 24 insertions(+), 19 deletions(-)
Index: linux-2.6/arch/x86/kernel/setup.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/setup.c +++ linux-2.6/arch/x86/kernel/setup.c @@ -293,10 +293,32 @@ static void __init init_gbpages(void) else direct_gbpages = 0; } + +static void __init cleanup_highmap_brk_end(void) +{ + pud_t *pud; + pmd_t *pmd; + + mmu_cr4_features = read_cr4(); + + /* + * _brk_end cannot change anymore, but it and _end may be + * located on different 2M pages. cleanup_highmap(), however, + * can only consider _end when it runs, so destroy any + * mappings beyond _brk_end here. + */ + pud = pud_offset(pgd_offset_k(_brk_end), _brk_end); + pmd = pmd_offset(pud, _brk_end - 1); + while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1)) + pmd_clear(pmd); +} #else static inline void init_gbpages(void) { } +static inline void cleanup_highmap_brk_end(void) +{ +} #endif static void __init reserve_brk(void) @@ -307,6 +329,8 @@ static void __init reserve_brk(void) /* Mark brk area as locked down and no longer taking any new allocations */ _brk_start = 0; + + cleanup_highmap_brk_end(); } #ifdef CONFIG_BLK_DEV_INITRD Index: linux-2.6/arch/x86/mm/init.c =================================================================== --- linux-2.6.orig/arch/x86/mm/init.c +++ linux-2.6/arch/x86/mm/init.c @@ -270,25 +270,6 @@ unsigned long __init_refok init_memory_m load_cr3(swapper_pg_dir); #endif -#ifdef CONFIG_X86_64 - if (!after_bootmem && !start) { - pud_t *pud; - pmd_t *pmd; - - mmu_cr4_features = read_cr4(); - - /* - * _brk_end cannot change anymore, but it and _end may be - * located on different 2M pages. cleanup_highmap(), however, - * can only consider _end when it runs, so destroy any - * mappings beyond _brk_end here. - */ - pud = pud_offset(pgd_offset_k(_brk_end), _brk_end); - pmd = pmd_offset(pud, _brk_end - 1); - while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1)) - pmd_clear(pmd); - } -#endif __flush_tlb_all(); if (!after_bootmem && e820_table_end > e820_table_start)
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