Red Hat Bugzilla – Bug 192396
Userspace software relying on PAGE_SIZE is broken
Last modified: 2007-11-30 17:11:33 EST
Description of problem: There is no PAGE_SIZE define in /usr/include/asm/page.h for ppc64. Version-Release number of selected component (if applicable): glibc-kernheaders-3.0-34 How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: The missing defines are: /* PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 12 #define PAGE_SIZE (1UL << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1))
Page size is variable; it is not a compile-time constant. If the #define still exists in other architectures' page.h, that's a temporary aberration and will also be fixed soon. Use sysconf(_SC_PAGE_SIZE);
If there is no PAGE_SIZE anymore, then remove the include file. It does not make sense to have an empty include file.
That's being worked upon. Some other files still include it without #ifdef __KERNEL__ though -- so until those are cleaned up, the empty file is still required.
(Clarifying since I expect to get duplicates...) http://www.opengroup.org/onlinepubs/009695399/basedefs/limits.h.html PAGE_SIZE (and PAGESIZE) are optional. Glibc has never defined them. Portable software must cope with that and use sysconf(_SC_PAGE_SIZE). Including kernel-private headers like <asm/page.h> is broken. That file is going away (from user visibility) and in some architectures PAGE_SIZE has _already_ been removed from the user-visible parts of it. Page size can be variable, and should be checked at runtime.