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[compiler] Allow for selective disabling of debug levels at runtime 

The usefulness of DBGLVL_IO is limited by the fact that many cards
require large numbers of uninteresting I/O reads/writes at device
probe time, typically when driving a bit-bashing I2C/SPI bus to read
the MAC address.

This patch adds the DBG_DISABLE() and DBG_ENABLE() macros, which can
be used to temporarily disable and re-enable selected debug levels.
Note that debug levels must still be enabled in the build in order to
function at all: you can't use DBG_ENABLE(DBGLVL_IO) in an object
built with DEBUG=object:1 and expect it to do anything.
This commit is contained in:
Michael Brown 2008-10-01 18:58:21 +01:00
parent 9b01a9fd9c
commit afe1323c76
1 changed files with 17 additions and 2 deletions
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19
src/include/compiler.h
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@ -131,11 +131,26 @@ extern void dbg_decolourise ( void );
extern void dbg_hex_dump_da ( unsigned long dispaddr,
const void *data, unsigned long len );
/* Compatibility with existing Makefile */
#if DEBUG_SYMBOL
#define DBGLVL DEBUG_SYMBOL
#define DBGLVL_MAX DEBUG_SYMBOL
#else
#define DBGLVL_MAX 0
#endif
/* Allow for selective disabling of enabled debug levels */
#if DBGLVL_MAX
int __debug_disable;
#define DBGLVL ( DBGLVL_MAX & ~__debug_disable )
#define DBG_DISABLE( level ) do { \
__debug_disable |= ( (level) & DBGLVL_MAX ); \
} while ( 0 )
#define DBG_ENABLE( level ) do { \
__debug_disable &= ~( (level) & DBGLVL_MAX ); \
} while ( 0 )
#else
#define DBGLVL 0
#define DBG_DISABLE( level ) do { } while ( 0 )
#define DBG_ENABLE( level ) do { } while ( 0 )
#endif
#define DBGLVL_LOG 1