uclinux-2008R1-RC8(bf561)到VDSP5的移植(56): __grab_cache_page

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本文适用于
ADI bf561 DSP
优视BF561EVB开发板
uclinux-2008r1-rc8 (移植到vdsp5)
Visual DSP++ 5.0


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在mm/filemap.c中有一个__grab_cache_page函数，此函数同样引起VDSP编译器错误：
../../mm/filemap.c
At end of source: : internal error: Uncaught exception Assertion failed raised
at ../../../bril/optimiser/dominators.c:910 (in pass
cleanup_scalar_stores_nonopt during compilation of
___grab_cache_page). Please submit a bug report with this message,
the command line used, type of machine and the output of the
compiler when you add -ED -v to the command line. Please also send
us the pre-processed file that is generated by the -ED option (the
file generated is named <original_filename>.i)

1 catastrophic error detected in the compilation of "../../mm/filemap.c".
Compilation aborted.
cc3089: fatal error: Compilation failed
看看这个函数的代码：
/*
* If the page was newly created, increment its refcount and add it to the
* caller's lru-buffering pagevec. This function is specifically for
* generic_file_write().
*/
static inline struct page *
__grab_cache_page(struct address_space *mapping, unsigned long index,
struct page **cached_page, struct pagevec *lru_pvec)
{
int err;
struct page *page;
repeat:
page = find_lock_page(mapping, index);
if (!page) {
if (!*cached_page) {
*cached_page = page_cache_alloc(mapping);
if (!*cached_page)
return NULL;
}
err = add_to_page_cache(*cached_page, mapping,
index, GFP_KERNEL);
if (err == -EEXIST)
goto repeat;
if (err == 0) {
page = *cached_page;
page_cache_get(page);
if (!pagevec_add(lru_pvec, page))
__pagevec_lru_add(lru_pvec);
*cached_page = NULL;
}
}
return page;
}
有了上次的经验，可以肯定问题发生在
*cached_page = page_cache_alloc(mapping);
将之修改为：
*cached_page = __alloc_pages(mapping_gfp_mask(mapping), 0,
NODE_DATA(0)->node_zonelists + gfp_zone(mapping_gfp_mask(mapping)));
搞定！