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util/error: Introduce warn_report_err_once()

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Depending on the configuration of the host and VM, a passthrough
device may generate recurring DMA mapping errors at runtime. In such
cases, reporting the issue once is sufficient.

We have already the warn/error_report_once() routines taking a format
and arguments. Using the same design pattern, add a new warning
variant taking an 'Error *' parameter.

Cc: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250206131438.1505542-2-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Cédric Le Goater 2025-02-06 14:14:29 +01:00
parent 7b3d5b84cb
commit 96b339cc4c
2 changed files with 23 additions and 0 deletions
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12
include/qapi/error.h
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@ -466,6 +466,18 @@ void warn_reportf_err(Error *err, const char *fmt, ...)
void error_reportf_err(Error *err, const char *fmt, ...)
G_GNUC_PRINTF(2, 3);
/*
* Similar to warn_report_err(), except it prints the message just once.
* Return true when it prints, false otherwise.
*/
bool warn_report_err_once_cond(bool *printed, Error *err);
#define warn_report_err_once(err) \
({ \
static bool print_once_; \
warn_report_err_once_cond(&print_once_, err); \
})
/*
* Just like error_setg(), except you get to specify the error class.
* Note: use of error classes other than ERROR_CLASS_GENERIC_ERROR is