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queue: fix QTAILQ_FOREACH_REVERSE_SAFE 

The iteration was stopping as soon as prev_var was set to NULL, and
therefore it skipped the first element.  Fortunately, or unfortunately,
we have only one use of QTAILQ_FOREACH_REVERSE_SAFE.  Thus this only
showed up as incorrect register preferences on the very first translation
block that was compiled.

Reported-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-02-04 16:40:18 +01:00
parent 5685349864
commit 5ed76a4c63
1 changed files with 1 additions and 1 deletions
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2
include/qemu/queue.h
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@ -439,7 +439,7 @@ union { \
#define QTAILQ_FOREACH_REVERSE_SAFE(var, head, field, prev_var) \
for ((var) = QTAILQ_LAST(head); \
(var) && ((prev_var) = QTAILQ_PREV(var, field)); \
(var) && ((prev_var) = QTAILQ_PREV(var, field), 1); \
(var) = (prev_var))
/*