郁闷啊，我load /boot/config*编译内核也不行
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: *** Error 1
make: Leaving directory `/usr/src/linux-2.4.21-27.EL/net/xfrm'
make: *** Error 2
make: Leaving directory `/usr/src/linux-2.4.21-27.EL/net/xfrm'
make: *** Error 2
make: Leaving directory `/usr/src/linux-2.4.21-27.EL/net'
make: *** 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 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？
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