diff options
| author | Paul Mackerras <paulus@ozlabs.org> | 2016-11-03 16:10:55 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-16 16:25:47 +0100 |
| commit | eae3f3ab7fb34732fbdd86fad79410aec48faf1d (patch) | |
| tree | 6c92cba760d9d03a6eea7ce087809eda4a5a8051 /Makefile | |
| parent | 9414a6309c7205c38ee3559a871ef165dd44c657 (diff) | |
powerpc/64: Fix checksum folding in csum_tcpudp_nofold and ip_fast_csum_nofold
commit b492f7e4e07a28e706db26cf4943bb0911435426 upstream.
These functions compute an IP checksum by computing a 64-bit sum and
folding it to 32 bits (the "nofold" in their names refers to folding
down to 16 bits). However, doing (u32) (s + (s >> 32)) is not
sufficient to fold a 64-bit sum to 32 bits correctly. The addition
can produce a carry out from bit 31, which needs to be added in to
the sum to produce the correct result.
To fix this, we copy the from64to32() function from lib/checksum.c
and use that.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions