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

  

 

欢迎转载，但请保留作者信息

 

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！