Messages in this thread |  | | Date | Tue, 6 Feb 2001 16:39:11 +0800 | From | Feng Chun <> | Subject | A Question About kernel source code |
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Hello everyone: I have a question about the linux source code.
consider the function:get_vm_area( mm/vmalloc.c ) struct vm_struct * get_vm_area(unsigned long size) { struct vm_struct **p, .... for (p = &vmlist; (tmp = *p) ; p = &tmp->next) { if (size + addr < (unsigned long) tmp->addr) break; addr = tmp->size + (unsigned long) tmp->addr; if (addr > VMALLOC_END-size) { kfree(area); return NULL; } } .... }
notice that here p is defined as a pointer to a pointer, why not
struct vm_struct *p, for (p=vmlist; (tmp=p); p=tmp->next) { .. }
does it mean that the later is not efficient as the former?
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