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BUILD: debug: make sure debug macros are never empty
As outlined in commit f7ebe584d7
("BUILD: debug: Add braces to if
statement calling only CHECK_IF()"), the BUG_ON() family of macros
is incorrectly defined to be empty when debugging is disabled, and
that can lead to trouble. Make sure they always fall back to the
usual "do { } while (0)". This may be backported to 2.6 if needed,
though no such issue was met there to date.
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parent
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@ -140,9 +140,9 @@ static inline __attribute((always_inline)) void ha_crash_now(void)
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# define CHECK_IF(cond) _BUG_ON_ONCE(cond, __FILE__, __LINE__, 1, "FATAL: check ", "")
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# endif
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#else
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# define BUG_ON(cond)
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# define WARN_ON(cond)
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# define CHECK_IF(cond)
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# define BUG_ON(cond) do { } while (0)
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# define WARN_ON(cond) do { } while (0)
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# define CHECK_IF(cond) do { } while (0)
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#endif
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/* These macros are only for hot paths and remain disabled unless DEBUG_STRICT is 2 or above.
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@ -164,8 +164,8 @@ static inline __attribute((always_inline)) void ha_crash_now(void)
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# define CHECK_IF_HOT(cond) _BUG_ON_ONCE(cond, __FILE__, __LINE__, 1, "FATAL: check ", "")
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# endif
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#else
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# define BUG_ON_HOT(cond)
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# define CHECK_IF_HOT(cond)
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# define BUG_ON_HOT(cond) do { } while (0)
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# define CHECK_IF_HOT(cond) do { } while (0)
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#endif
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