[PATCH] powerpc: fix sysconf support for cache geometries

[Paul Clarke]

Commit cdfbe5037f2f67bf5f560b73732b69d0fabe2314 added sysconf support
for cache geometries on powerpc, but mishandled errno.  For valid input
parameters, sysconf() should not set errno.

2017-06-15  Paul A. Clarke  <pc@us.ibm.com>

	* sysdeps/unix/sysv/linux/powerpc/sysconf.c: Remove references
	to errno, and simplify remaining related code.
---
 sysdeps/unix/sysv/linux/powerpc/sysconf.c | 37 +++++++------------------------
 1 file changed, 8 insertions(+), 29 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/powerpc/sysconf.c b/sysdeps/unix/sysv/linux/powerpc/sysconf.c
index 10c4aa0..7bed701 100644
--- a/sysdeps/unix/sysv/linux/powerpc/sysconf.c
+++ b/sysdeps/unix/sysv/linux/powerpc/sysconf.c
@@ -22,37 +22,16 @@
 
 static long linux_sysconf (int name);
 
-static long
-auxv2sysconf (unsigned long type)
-{
-  long rc;
-  rc = __getauxval (type);
-  if (rc == 0)
-  {
-    __set_errno (EINVAL);
-    rc = -1;
-  }
-  return rc;
-}
-
-static long
+static inline long
 auxv2sysconf_cache_associativity (unsigned long type)
 {
-  long rc;
-  rc = auxv2sysconf (type);
-  if (rc != -1)
-    rc = (rc & 0xffff0000) >> 16;
-  return rc;
+  return (__getauxval (type) & 0xffff0000) >> 16;
 }
 
-static long
+static inline long
 auxv2sysconf_cache_linesize (unsigned long type)
 {
-  long rc;
-  rc = auxv2sysconf (type);
-  if (rc != -1)
-    rc = rc & 0xffff;
-  return rc;
+  return __getauxval (type) & 0xffff;
 }
 
 /* Get the value of the system variable NAME.  */
@@ -62,25 +41,25 @@ __sysconf (int name)
   switch (name)
     {
       case _SC_LEVEL1_ICACHE_SIZE:
-	return auxv2sysconf (AT_L1I_CACHESIZE);
+	return __getauxval (AT_L1I_CACHESIZE);
       case _SC_LEVEL1_ICACHE_ASSOC:
 	return auxv2sysconf_cache_associativity (AT_L1I_CACHEGEOMETRY);
       case _SC_LEVEL1_ICACHE_LINESIZE:
 	return auxv2sysconf_cache_linesize (AT_L1I_CACHEGEOMETRY);
       case _SC_LEVEL1_DCACHE_SIZE:
-	return auxv2sysconf (AT_L1D_CACHESIZE);
+	return __getauxval (AT_L1D_CACHESIZE);
       case _SC_LEVEL1_DCACHE_ASSOC:
 	return auxv2sysconf_cache_associativity (AT_L1D_CACHEGEOMETRY);
       case _SC_LEVEL1_DCACHE_LINESIZE:
 	return auxv2sysconf_cache_linesize (AT_L1D_CACHEGEOMETRY);
       case _SC_LEVEL2_CACHE_SIZE:
-	return auxv2sysconf (AT_L2_CACHESIZE);
+	return __getauxval (AT_L2_CACHESIZE);
       case _SC_LEVEL2_CACHE_ASSOC:
 	return auxv2sysconf_cache_associativity (AT_L2_CACHEGEOMETRY);
       case _SC_LEVEL2_CACHE_LINESIZE:
 	return auxv2sysconf_cache_linesize (AT_L2_CACHEGEOMETRY);
       case _SC_LEVEL3_CACHE_SIZE:
-	return auxv2sysconf (AT_L3_CACHESIZE);
+	return __getauxval (AT_L3_CACHESIZE);
       case _SC_LEVEL3_CACHE_ASSOC:
 	return auxv2sysconf_cache_associativity (AT_L3_CACHEGEOMETRY);
       case _SC_LEVEL3_CACHE_LINESIZE:
-- 
1.8.3.1