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libxl: avoid compiler warning

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cc1: warnings being treated as errors
libxl/libxl_driver.c: In function 'libxlDomainSetVcpusFlags':
libxl/libxl_driver.c:1570:14: error: cast from function call of type 'double' to non-matching type 'unsigned int' [-Wbad-function-cast]
libxl/libxl_driver.c:1578:15: error: cast from function call of type 'double' to non-matching type 'unsigned int' [-Wbad-function-cast]

This was the only use of floor() and ceil(), and floating-point
is overkill for power-of-two manipulations.

* src/libxl/libxl_driver.c (libxlDomainSetVcpusFlags): Avoid -lm
for trivial computations.
This commit is contained in:
Eric Blake 2011-04-05 10:07:57 -06:00
parent a7e80bde11
commit 3eb869a04b
1 changed files with 2 additions and 3 deletions
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5
src/libxl/libxl_driver.c
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@ -1567,15 +1567,14 @@ libxlDomainSetVcpusFlags(virDomainPtr dom, unsigned int nvcpus,
if (!(def = virDomainObjGetPersistentDef(driver->caps, vm)))
goto cleanup;
maplen = (unsigned int) ceil((double) nvcpus / 8);
maplen = VIR_CPU_MAPLEN(nvcpus);
if (VIR_ALLOC_N(bitmask, maplen) < 0) {
virReportOOMError();
goto cleanup;
}
memset(bitmask, 0, maplen);
for (i = 0; i < nvcpus; ++i) {
pos = (unsigned int) floor((double) i / 8);
pos = i / 8;
bitmask[pos] |= 1 << (i % 8);
}