[Intel-gfx] [PATCH xf86-video-intel] sna: Use a more portable way to determine total RAM size

[Mark Kettenis]

From: Mark Kettenis <kettenis at openbsd.org>

The sysinfo function is Linux-specific.  sysconf(_SC_PHYS_PAGES), while
not truly portable, is available on many more systems, including Linux,
Solaris, NetBSD, FreeBSD and OpenBSD.  So use that instead.  Verified
that this results in the same value as the sysinfo call on a handful of
Linux systems.

Signed-off-by: Mark Kettenis <kettenis at openbsd.org>
---
 configure.ac   |  1 -
 src/sna/kgem.c | 14 ++++----------
 2 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/configure.ac b/configure.ac
index de3990d..88e2c80 100644
--- a/configure.ac
+++ b/configure.ac
@@ -200,7 +200,6 @@ AC_ARG_ENABLE(sna,
 	      [SNA="$enableval"],
 	      [SNA=auto])
 
-AC_CHECK_HEADERS([sys/sysinfo.h], , SNA=no)
 if test "x$SNA" = "xauto" && pkg-config --exists "xorg-server >= 1.10"; then
 	SNA=yes
 fi
diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index c6ed114..20f774a 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -46,10 +46,6 @@
 #include <memcheck.h>
 #endif
 
-#if HAVE_SYS_SYSINFO_H
-#include <sys/sysinfo.h>
-#endif
-
 static struct kgem_bo *
 search_linear_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags);
 
@@ -641,13 +637,11 @@ agp_aperture_size(struct pci_device *dev, unsigned gen)
 static size_t
 total_ram_size(void)
 {
-#if HAVE_SYS_SYSINFO_H
-	struct sysinfo info;
-	if (sysinfo(&info) == 0)
-		return info.totalram * info.mem_unit;
-#endif
-
+#ifdef _SC_PHYS_PAGES
+	return sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGE_SIZE);
+#else
 	return 0;
+#endif
 }
 
 static size_t
-- 
1.8.1.2