libbb: add and use infrastructure for fixed page size optimization

function                                             old     new   delta
procps_scan                                         1121    1118      -3
getpagesize                                            6       -      -6
rpm_main                                            1037    1027     -10
rpm2cpio_main                                        120     110     -10
ptok                                                  38      21     -17
time_main                                           1282    1261     -21
mkswap_main                                          317     278     -39
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 0/6 up/down: 0/-106)           Total: -106 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/miscutils/devmem.c b/miscutils/devmem.c
index e8dce5225..f9f0276bc 100644
--- a/miscutils/devmem.c
+++ b/miscutils/devmem.c
@@ -75,7 +75,7 @@ int devmem_main(int argc UNUSED_PARAM, char **argv)
                 bb_show_usage(); /* one of bb_strtouXX failed */
 
         fd = xopen("/dev/mem", argv[3] ? (O_RDWR | O_SYNC) : (O_RDONLY | O_SYNC));
-        mapped_size = page_size = getpagesize();
+        mapped_size = page_size = bb_getpagesize();
         offset_in_page = (unsigned)target & (page_size - 1);
         if (offset_in_page + width > page_size) {
                 /* This access spans pages.