Fix compilation on musl-based systems

This allows to build ROCT-Thunk-Interface for Alpine Linux, Gentoo with musl profile and so on.

List of changes:
* Fix redefinition of PAGE_SIZE from limits.h
* Use NAME_MAX from limits.h

Closes #65

Change-Id: Ibdb0ef5668a07b7b403fcc4a44cd2658e00a584a
Signed-off-by: Sv. Lockal <lockalsash@gmail.com>
Signed-off-by: Kent Russell <kent.russell@amd.com>


[ROCm/ROCR-Runtime commit: 9a89997b5f]

projects/rocr-runtime/src/globals.c

@@ -32,7 +32,11 @@ unsigned long kfd_open_count;
 unsigned long system_properties_count;
 pthread_mutex_t hsakmt_mutex = PTHREAD_MUTEX_INITIALIZER;
 bool is_dgpu;
+
+#ifndef PAGE_SIZE
 int PAGE_SIZE;
+#endif
+
 int PAGE_SHIFT;
 
 /* whether to check all dGPUs in the topology support SVM API */

projects/rocr-runtime/src/libhsakmt.h

@@ -64,7 +64,11 @@ extern HsaVersionInfo kfd_version_info;
 	do { if ((minor) > kfd_version_info.KernelInterfaceMinorVersion)\
 		return HSAKMT_STATUS_NOT_SUPPORTED; } while (0)
 
+/* Might be defined in limits.h on platforms where it is constant (used by musl) */
+/* See also: https://pubs.opengroup.org/onlinepubs/7908799/xsh/limits.h.html */
+#ifndef PAGE_SIZE
 extern int PAGE_SIZE;
+#endif
 extern int PAGE_SHIFT;
 
 /* VI HW bug requires this virtual address alignment */

projects/rocr-runtime/src/openclose.c

@@ -114,7 +114,9 @@ static void clear_after_fork(void)
 
 static inline void init_page_size(void)
 {
+#ifndef PAGE_SIZE
 	PAGE_SIZE = sysconf(_SC_PAGESIZE);
+#endif
 	PAGE_SHIFT = ffs(PAGE_SIZE) - 1;
 }
 

projects/rocr-runtime/src/topology.c

@@ -32,6 +32,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <ctype.h>
+#include <limits.h>
 
 #include <errno.h>
 #include <sys/sysinfo.h>
@@ -1372,6 +1373,10 @@ static int topology_create_temp_cpu_cache_list(int node,
 	 * which can be present twice in the string above. 29 is for the prefix
 	 * and the +6 is for the cache suffix
 	 */
+#ifndef MAXNAMLEN
+/* MAXNAMLEN is the BSD name for NAME_MAX. glibc aliases this as NAME_MAX, but not musl */
+#define MAXNAMLEN NAME_MAX
+#endif
 	const uint32_t MAXPATHSIZE = 29 + MAXNAMLEN + (MAXNAMLEN + 6);
 	cpu_cacheinfo_t *p_temp_cpu_ci_list; /* a list of cpu_ci */
 	char path[MAXPATHSIZE], node_dir[MAXPATHSIZE];