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oslib-posix: check for posix_memalign in configure script

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Check for the presence of posix_memalign() in the configure script,
not using "defined(_POSIX_C_SOURCE) && !defined(__sun__)".  This
lets qemu use posix_memalign() on NetBSD versions that have it,
instead of falling back to valloc() which is wasteful when the
required alignment is smaller than a page.

Signed-off-by: Andreas Gustafsson <gson@gson.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Kamil Rytarowski <n54@gmx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andreas Gustafsson 2018-01-04 19:39:36 +02:00 committed by Michael Tokarev
parent a348f64d46
commit 9bc5a7193f
2 changed files with 20 additions and 1 deletions
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19
configure vendored
View File

@ -4658,6 +4658,21 @@ if compile_prog "" "" ; then
posix_madvise=yes
fi
##########################################
# check if we have posix_memalign()
posix_memalign=no
cat > $TMPC << EOF
#include <stdlib.h>
int main(void) {
void *p;
return posix_memalign(&p, 8, 8);
}
EOF
if compile_prog "" "" ; then
posix_memalign=yes
fi
##########################################
# check if we have posix_syslog
@ -5746,6 +5761,7 @@ echo "preadv support $preadv"
echo "fdatasync $fdatasync"
echo "madvise $madvise"
echo "posix_madvise $posix_madvise"
echo "posix_memalign $posix_memalign"
echo "libcap-ng support $cap_ng"
echo "vhost-net support $vhost_net"
echo "vhost-scsi support $vhost_scsi"
@ -6232,6 +6248,9 @@ fi
if test "$posix_madvise" = "yes" ; then
echo "CONFIG_POSIX_MADVISE=y" >> $config_host_mak
fi
if test "$posix_memalign" = "yes" ; then
echo "CONFIG_POSIX_MEMALIGN=y" >> $config_host_mak
fi
if test "$spice" = "yes" ; then
echo "CONFIG_SPICE=y" >> $config_host_mak

2
util/oslib-posix.c
View File

@ -105,7 +105,7 @@ void *qemu_try_memalign(size_t alignment, size_t size)
alignment = sizeof(void*);
}
#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
#if defined(CONFIG_POSIX_MEMALIGN)
int ret;
ret = posix_memalign(&ptr, alignment, size);
if (ret != 0) {