郁闷啊，我load /boot/config*编译内核也不行

harryzhu

我想打开硬盘的DMA模式，操作失败
hdparm -d1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma    =  0 (off)

想想可能是内核不支持，需要重新编译一下，可是改来改去总是在make bzImage时出错，后来索性load /boot/config*，看看当前使用的内核能不能编译通过，结果是照样出错，出错信息如下：
/usr/src/linux-2.4.21-27.EL/include/net/ah.h: In function `ah_hmac_digest':
/usr/src/linux-2.4.21-27.EL/include/net/ah.h:26: warning: implicit declaration of function `crypto_hmac_init'
/usr/src/linux-2.4.21-27.EL/include/net/ah.h:27: `crypto_hmac_update' undeclared (first use in this function)
/usr/src/linux-2.4.21-27.EL/include/net/ah.h:27: (Each undeclared identifier is reported only once
/usr/src/linux-2.4.21-27.EL/include/net/ah.h:27: for each function it appears in.)
/usr/src/linux-2.4.21-27.EL/include/net/ah.h:28: warning: implicit declaration of function `crypto_hmac_final'
In file included from xfrm_algo.c:19:
/usr/src/linux-2.4.21-27.EL/include/net/esp.h: In function `esp_hmac_digest':
/usr/src/linux-2.4.21-27.EL/include/net/esp.h:49: `crypto_hmac_update' undeclared (first use in this function)
make[3]: *** [xfrm_algo.o] Error 1
make[3]: Leaving directory `/usr/src/linux-2.4.21-27.EL/net/xfrm'
make[2]: *** [first_rule] Error 2
make[2]: Leaving directory `/usr/src/linux-2.4.21-27.EL/net/xfrm'
make[1]: *** [_subdir_xfrm] Error 2
make[1]: Leaving directory `/usr/src/linux-2.4.21-27.EL/net'
make: *** [_dir_net] Error 2

哪位老大帮帮忙了，看看什么问题，郁闷哦，我保证什么都没有改

harryzhu

发现个问题，即时我load /boot/config*，直接save and exit，对比.config & /boot/config*，两个文件也有很大差别，不知道为什么

后来再测，直接把cp /boot/config* /usr/src/linux-2.4/.config，运行make dep时就出错，是不是这个/boot/config*文件并不可靠啊？最好还是自己重新编译一遍？