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[TIPC]: Enhancements to message header writing 

This patch makes two enhancements to the routine used to
set bit fields within a TIPC message header:

 1) It now ignores any bits of the new field value that are not
    covered by the mask being used.  (Previously, if the new value
    exceeded the size of the mask the extra bits could corrupt
    other fields in the message header word being updated.)

 2) The code has been optimized to minimize the number of run-time
    endianness conversion operations by leveraging the fact that the
    mask (and, in some cases, the value as well) is constant and the
    necessary conversion can be performed by the compiler.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2008-03-06 15:08:10 -08:00 committed by David S. Miller
parent 37695420a2
commit c0cb7ef086
1 changed files with 4 additions and 2 deletions
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6
net/tipc/msg.h
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@ -70,8 +70,10 @@ static inline void msg_set_bits(struct tipc_msg *m, u32 w,
u32 pos, u32 mask, u32 val) u32 pos, u32 mask, u32 val)
{ {
val = (val & mask) << pos; val = (val & mask) << pos;
m->hdr[w] &= ~htonl(mask << pos); val = htonl(val);
m->hdr[w] |= htonl(val); mask = htonl(mask << pos);
m->hdr[w] &= ~mask;
m->hdr[w] |= val;
} }
/* /*