Messages in this thread |  | | From | Sardañons, Eliel <> | | Subject | linux/mm/memory.c [ void clear_page_tables(...); ] question... | | Date | Tue, 27 Mar 2001 11:54:55 -0300 |
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Function taked from: linux/mm/memory.c
void clear_page_tables(struct mm_struct *mm, unsigned long first, int nr) { pgd_t * page_dir = mm->pgd;
if (page_dir && page_dir != swapper_pg_dir) { page_dir += first; do { free_one_pgd(page_dir); page_dir++; } while (--nr);
/* keep the page table cache within bounds */ check_pgt_cache(); } }
Hello: I'm trying to understand the code, and sorry if this is a stupid question. Here in this function you check if mm->pgd is the swapper_pg_dir if it's you don't clear it, but then you increment page_dir++ in the loop and you don't check if page_dir != swapper_pg_dir ...why? may be when you increment page_dir it can't become swapper_pg_dir because swapper_pg_dir is always <= page_dir?.. or is something else?
Thanks in advance
Eliel Sardanons
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