Looking at the source code, it seems like the __get_free_pages call is
failing. But I don't know what is the significance of said call, and why
it fails beyond the 1MiB limit.
/**
* hmcdrv_cache_startup() - startup of HMC drive cache
* @cachesize: cache size
*
* Return: 0 on success, else a (negative) error code
*/
int hmcdrv_cache_startup(size_t cachesize)
{
if (cachesize > 0) { /* perform caching ? */
hmcdrv_cache_order = get_order(cachesize);
hmcdrv_cache_file.content =
(void *) __get_free_pages(GFP_KERNEL | GFP_DMA,
hmcdrv_cache_order);
if (!hmcdrv_cache_file.content) {
pr_err("Allocating the requested cache size of %zu
bytes failed\n",
cachesize);
return -ENOMEM;
}
pr_debug("content cache enabled, size is %zu bytes\n",
cachesize);
}
hmcdrv_cache_file.len = cachesize;
return 0;
}
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https://bugs.launchpad.net/bugs/1806115
Title:
cannot set hmcdrv cachesize to 1GB
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