内核启动错误：vmap allocation for size 314576896 failed: use vmalloc= to increase size
逻辑部分加了一个PCIE-RC组件，启动时发现如下错误：
# insmod recorder_all_dongtai.ko
[ 188.999787] recorder_all: loading out-of-tree module taints kernel.
[ 189.007265] module loading...
[ 189.779610] vmap allocation for size 314576896 failed: use vmalloc= to increase size
[ 189.827439] alloc rcd buffer memory failed
从打印信息来看，是vmalloc 申请失败，原因是申请的空间太大了。
从逻辑组件的设备树可以看到，需要申请256M，而目前实际分配给vmalloc的只有200多M (通过 cat /proc/meminfo查看)。
修改办法：
修改bootargs的vmalloc大小。（在设备树中修改）
chosen {
bootargs = "console=ttyPS0,115200 root=/dev/ram rw earlyprintk vmalloc=400M";
linux,stdout-path = "/amba@0/serial@e0000000";
};修改后，打印如下：
zynq> cat /proc/meminfo
MemTotal: 901364 kB
MemFree: 871852 kB
MemAvailable: 870244 kB
Buffers: 184 kB
Cached: 4696 kB
SwapCached: 0 kB
Active: 3036 kB
Inactive: 2516 kB
Active(anon): 672 kB
Inactive(anon): 0 kB
Active(file): 2364 kB
Inactive(file): 2516 kB
Unevictable: 0 kB
Mlocked: 0 kB
HighTotal: 293888 kB
HighFree: 285408 kB
LowTotal: 607476 kB
LowFree: 586444 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 672 kB
Mapped: 3268 kB
Shmem: 0 kB
Slab: 3700 kB
SReclaimable: 1264 kB
SUnreclaim: 2436 kB
KernelStack: 320 kB
PageTables: 104 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 450680 kB
Committed_AS: 1824 kB
VmallocTotal: 401408 kB
VmallocUsed: 19516 kB
VmallocChunk: 277500 kB
CmaTotal: 16384 kB
CmaFree: 16128 kB