asm/page.h

[Dan Nicholson]

On Tue, Apr 22, 2008 at 12:12 PM, Jeremy Huntwork
<jhuntwork at linuxfromscratch.org> wrote:
> On Tue, Apr 22, 2008 at 01:09:10PM -0600, Jeremy Huntwork wrote:
>  > I removed the line where it includes the header and Perl built
>  > successfully and all tests passed. This is also what Gentoo does:
>  > https://bugs.gentoo.org/show_bug.cgi?id=168312
>  >
>  > However, there's likely a better and more robust solution. I haven't dug
>  > any deeper yet.
>
>  Actually, removing the line may just be good enough. PAGE_SIZE doesn't
>  really seem to be used anywhere relevant:
>
>  grep PAGE_SIZE . -R
>  ./ext/IPC/SysV/SysV.xs:/* Required in BSDI to get PAGE_SIZE definition
>  for SHMLBA.
>  ./os2/os2.c:  "PAGE_SIZE",
>  ./os2/Changes:          MAX_WAIT, MIN_SLICE, MAX_SLICE, PAGE_SIZE,
>  ./pod/perl571delta.pod:For getpagesize(), though you should prefer
>  POSIX::sysconf(_SC_PAGE_SIZE))
>  ./README.os2:   MAX_WAIT, MIN_SLICE, MAX_SLICE, PAGE_SIZE,
>  ./perlio.c:#if defined(HAS_SYSCONF) && (defined(_SC_PAGESIZE) ||
>  defined(_SC_PAGE_SIZE))
>  ./perlio.c:                     page_size = sysconf(_SC_PAGE_SIZE);

Cool. I guess it's just an extraneous #include in SysV.xs. Here's
everything defined in my 2.6.22 asm/page.h (on x86):

#define PAGE_SHIFT      12
#define PAGE_SIZE       (1UL << PAGE_SHIFT)
#define PAGE_MASK       (~(PAGE_SIZE-1))

#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)

So, I suppose you could grep for some regex (PAGE_(SHIFT|SIZE|MASK))
of those macros to be safe.

--
Dan