- 16 1月, 2018 1 次提交
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由 Eric Blake 提交于
The point of writing a macro embedded in a 'do { ... } while (0)' loop (particularly if the macro has multiple statements or would otherwise end with an 'if' statement) is so that the macro can be used as a drop-in statement with the caller supplying the trailing ';'. Although our coding style frowns on brace-less 'if': if (cond) statement; else something else; that is the classic case where failure to use do/while(0) wrapping would cause the 'else' to pair with any embedded 'if' in the macro rather than the intended outer 'if'. But conversely, if the macro includes an embedded ';', then the same brace-less coding style would now have two statements, making the 'else' a syntax error rather than pairing with the outer 'if'. Thus, even though our coding style with required braces is not impacted, ending a macro with ';' makes our code harder to port to projects that use brace-less styles. The change should have no semantic impact. I was not able to fully compile-test all of the changes (as some of them are examples of the ugly bit-rotting debug print statements that are completely elided by default, and I didn't want to recompile with the necessary -D witnesses - cleaning those up is left as a bite-sized task for another day); I did, however, audit that for all files touched, all callers of the changed macros DID supply a trailing ';' at the callsite, and did not appear to be used as part of a brace-less conditional. Found mechanically via: $ git grep -B1 'while (0);' | grep -A1 \\\\ Signed-off-by: NEric Blake <eblake@redhat.com> Acked-by: NCornelia Huck <cohuck@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Acked-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20171201232433.25193-7-eblake@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 14 6月, 2016 1 次提交
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由 KONRAD Frederic 提交于
This is the implementation of the DPDMA. Signed-off-by: NKONRAD Frederic <fred.konrad@greensocs.com> Reviewed-by: NAlistair Francis <alistair.francis@xilinx.com> Tested-By: NHyun Kwon <hyun.kwon@xilinx.com> Message-id: 1465833014-21982-8-git-send-email-fred.konrad@greensocs.com Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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