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SubjectRe: [PATCH 1/4] Net device error logging, revised
Jim Keniston wrote:
> #define netdev_printk(sevlevel, netdev, msglevel, format, arg...) \
> do { \
> if (NETIF_MSG_##msglevel == NETIF_MSG_ALL || ((netdev)->msg_enable & NETIF_MSG_##msglevel)) { \
> char pfx[40]; \
> printk(sevlevel "%s: " format , make_netdev_msg_prefix(pfx, netdev) , ## arg); \
> }} while (0)
> This would make your code bigger, but not that much bigger for the common case where
> the msglevel is omitted (and the 'if(...)' is optimized out).

"NETIF_MSG_" is silly and should be eliminated.
A separate "NETIF_MSG_ALL" test is not needed, because msg_enable is a
bitmask. A msg_enable of 0xffffffff will naturally create a NETIF_MSG_ALL.

Also, whatever mechanism is created, it needs to preserve the feature of
the existing system:

if (a quick bitmask test)
do something

And preferably "do something" is not inlined, because printk'ing --
although it may appear in a fast path during debugging -- cannot be
considered a fast path itself.


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