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2562755ee7
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: Eric Blake <eblake@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20171201232433.25193-7-eblake@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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| .. | ||
| a9gtimer.c | ||
| allwinner-a10-pit.c | ||
| altera_timer.c | ||
| arm_mptimer.c | ||
| arm_timer.c | ||
| armv7m_systick.c | ||
| aspeed_timer.c | ||
| cadence_ttc.c | ||
| cmsdk-apb-timer.c | ||
| digic-timer.c | ||
| ds1338.c | ||
| etraxfs_timer.c | ||
| exynos4210_mct.c | ||
| exynos4210_pwm.c | ||
| exynos4210_rtc.c | ||
| grlib_gptimer.c | ||
| hpet.c | ||
| i8254_common.c | ||
| i8254.c | ||
| imx_epit.c | ||
| imx_gpt.c | ||
| lm32_timer.c | ||
| m48t59-internal.h | ||
| m48t59-isa.c | ||
| m48t59.c | ||
| Makefile.objs | ||
| mc146818rtc.c | ||
| milkymist-sysctl.c | ||
| mips_gictimer.c | ||
| mss-timer.c | ||
| omap_gptimer.c | ||
| omap_synctimer.c | ||
| pl031.c | ||
| puv3_ost.c | ||
| pxa2xx_timer.c | ||
| sh_timer.c | ||
| slavio_timer.c | ||
| stm32f2xx_timer.c | ||
| sun4v-rtc.c | ||
| trace-events | ||
| twl92230.c | ||
| xilinx_timer.c | ||