linux内核编译make碰到了一个error?
In file included from drivers/video/console/vgacon.c:51:
include/video/vga.h: In function `vga_io_r':
include/video/vga.h:226: warning: comparison is always true due to limited range of data type
include/video/vga.h: In function `vga_io_w':
include/video/vga.h:231: warning: comparison is always true due to limited range of data type
include/video/vga.h: In function `vga_io_w_fast':
include/video/vga.h:237: warning: comparison is always true due to limited range of data type
include/video/vga.h:237: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `write_vga':
drivers/video/console/vgacon.c:149: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:149: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:150: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:150: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `vgacon_startup':
drivers/video/console/vgacon.c:489: error: `PCIMEM_BASE' undeclared (first use in this function)
drivers/video/console/vgacon.c:489: error: (Each undeclared identifier is reported only once
drivers/video/console/vgacon.c:489: error: for each function it appears in.)
drivers/video/console/vgacon.c: In function `vgacon_set_cursor_size':
drivers/video/console/vgacon.c:647: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:648: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:649: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:650: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:659: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:660: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:661: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:662: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `vgacon_doresize':
drivers/video/console/vgacon.c:743: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:744: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:749: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:750: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:758: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:759: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:767: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:768: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:769: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:770: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:773: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:774: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:775: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:776: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:779: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:780: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:781: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:782: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:785: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:786: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `vga_vesa_blank':
drivers/video/console/vgacon.c
74: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c
78: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c
79: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c
80: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c
81: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:882: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:883: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:884: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:885: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:886: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:887: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:888: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:889: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:890: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:891: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:892: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:893: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:912: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:913: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:914: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:915: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:916: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:917: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:926: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:927: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:928: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:929: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:934: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `vga_vesa_unblank':
drivers/video/console/vgacon.c:944: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:945: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:946: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:947: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:948: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:949: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:950: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:951: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:952: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:953: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:954: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:955: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:956: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:957: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:958: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:959: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:965: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `vgacon_do_font_op':
drivers/video/console/vgacon.c:1047: error: `PCIMEM_BASE' undeclared (first use in this function)
drivers/video/console/vgacon.c:1162: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1167: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c: In function `vgacon_adjust_height':
drivers/video/console/vgacon.c:1197: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1198: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1199: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1200: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1209: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1210: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1211: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1212: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1213: warning: comparison is always true due to limited range of data type
drivers/video/console/vgacon.c:1214: warning: comparison is always true due to limited range of data type
make[3]: *** [drivers/video/console/vgacon.o] Error 1
make[2]: *** [drivers/video/console] Error 2
make[1]: *** [drivers/video] Error 2
make: *** [drivers] Error 2
谢谢各位帮忙指点一下，谢谢
