diff options
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/page.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 6d5367060a5..39faa4ac966 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -158,6 +158,9 @@ static inline int page_reset_referenced(unsigned long addr) * race against modification of the referenced bit. This function * should therefore only be called if it is not mapped in any * address space. + * + * Note that the bit gets set whenever page content is changed. That means + * also when the page is modified by DMA or from inside the kernel. */ #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped) |