diff options
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index c554768b1fa2..d0ee17029e99 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -981,6 +981,19 @@ void __init hash__early_init_devtree(void) void __init hash__early_init_mmu(void) { + /* + * We have code in __hash_page_64K() and elsewhere, which assumes it can + * do the following: + * new_pte |= (slot << H_PAGE_F_GIX_SHIFT) & (H_PAGE_F_SECOND | H_PAGE_F_GIX); + * + * Where the slot number is between 0-15, and values of 8-15 indicate + * the secondary bucket. For that code to work H_PAGE_F_SECOND and + * H_PAGE_F_GIX must occupy four contiguous bits in the PTE, and + * H_PAGE_F_SECOND must be placed above H_PAGE_F_GIX. Assert that here + * with a BUILD_BUG_ON(). + */ + BUILD_BUG_ON(H_PAGE_F_SECOND != (1ul << (H_PAGE_F_GIX_SHIFT + 3))); + htab_init_page_sizes(); /* |