Messages in this thread Patch in this message |  | | Date | Sun, 10 Sep 2000 20:31:35 +0200 (CEST) | From | wollny <> | Subject | Bug in 2.4.0-test8: ramfs + highmem + patch |
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Hello,
using ramfs with highmem enabled (and ehough RAM ;) yields a possible :Unable to handle kernel NULL pointer dereference at virtual address 00000000 :printing eip: :c0166f88 [snip]
This is in asm/string.h: 518 called by fs/ramfs/inode.c:68
here page_address used to access the memory. With the following patch I replaced it by kmap/kunmap. This solved the problem for me:
--- 2.4.0-test8/fs/ramfs/inode.c Fri Aug 11 20:06:19 2000 +++ 2.4.0-test8-my/fs/ramfs/inode.c Sun Sep 10 19:48:59 2000 @@ -65,7 +65,8 @@ static int ramfs_readpage(struct file *file, struct page * page) { if (!Page_Uptodate(page)) { - memset(page_address(page), 0, PAGE_CACHE_SIZE); + memset(kmap(page), 0, PAGE_CACHE_SIZE); + kunmap(page); flush_dcache_page(page); SetPageUptodate(page); }
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