From dce452dc5278f2985d21315721a6ba802537b862 Mon Sep 17 00:00:00 2001
From: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Thu, 2 Aug 2018 23:49:19 +0530
Subject: [PATCH] Rename the glibc.tune namespace to glibc.cpu

The glibc.tune namespace is vaguely named since it is a 'tunable', so
give it a more specific name that describes what it refers to.  Rename
the tunable namespace to 'cpu' to more accurately reflect what it
encompasses.  Also rename glibc.tune.cpu to glibc.cpu.name since
glibc.cpu.cpu is weird.

	* NEWS: Mention the change.
	* elf/dl-tunables.list: Rename tune namespace to cpu.
	* sysdeps/powerpc/dl-tunables.list: Likewise.
	* sysdeps/x86/dl-tunables.list: Likewise.
	* sysdeps/aarch64/dl-tunables.list: Rename tune.cpu to
	cpu.name.
	* elf/dl-hwcaps.c (_dl_important_hwcaps): Adjust.
	* elf/dl-hwcaps.h (GET_HWCAP_MASK): Likewise.
	* manual/README.tunables: Likewise.
	* manual/tunables.texi: Likewise.
	* sysdeps/powerpc/cpu-features.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.c
	(init_cpu_features): Likewise.
	* sysdeps/x86/cpu-features.c: Likewise.
	* sysdeps/x86/cpu-features.h: Likewise.
	* sysdeps/x86/cpu-tunables.c: Likewise.
	* sysdeps/x86_64/Makefile: Likewise.
	* sysdeps/x86/dl-cet.c: Likewise.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
---
 NEWS                                          |  3 +-
 elf/dl-hwcaps.c                               |  2 +-
 elf/dl-hwcaps.h                               |  2 +-
 elf/dl-tunables.list                          |  2 +-
 manual/README.tunables                        |  6 +--
 manual/tunables.texi                          | 40 +++++++++----------
 sysdeps/aarch64/dl-tunables.list              |  4 +-
 sysdeps/powerpc/cpu-features.c                |  2 +-
 sysdeps/powerpc/dl-tunables.list              |  2 +-
 .../unix/sysv/linux/aarch64/cpu-features.c    |  2 +-
 sysdeps/x86/Makefile                          |  6 +--
 sysdeps/x86/cpu-features.c                    |  6 +--
 sysdeps/x86/cpu-features.h                    |  2 +-
 sysdeps/x86/cpu-tunables.c                    |  4 +-
 sysdeps/x86/dl-cet.c                          |  2 +-
 sysdeps/x86/dl-tunables.list                  |  2 +-
 sysdeps/x86_64/Makefile                       |  4 +-
 17 files changed, 46 insertions(+), 45 deletions(-)

diff --git a/NEWS b/NEWS
index 33f7ba56c0..6c062a5959 100644
--- a/NEWS
+++ b/NEWS
@@ -13,7 +13,8 @@ Major new features:
 
 Deprecated and removed features, and other changes affecting compatibility:
 
-  [Add deprecations, removals and changes affecting compatibility here]
+* The glibc.tune tunable namespace has been renamed to glibc.cpu and the
+  tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
 
 Changes to build and runtime requirements:
 
diff --git a/elf/dl-hwcaps.c b/elf/dl-hwcaps.c
index 23482a88a1..ecf00b4577 100644
--- a/elf/dl-hwcaps.c
+++ b/elf/dl-hwcaps.c
@@ -140,7 +140,7 @@ _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
 	 string and bit like you can ignore an OS-supplied HWCAP bit.  */
       hwcap_mask |= (uint64_t) mask << _DL_FIRST_EXTRA;
 #if HAVE_TUNABLES
-      TUNABLE_SET (glibc, tune, hwcap_mask, uint64_t, hwcap_mask);
+      TUNABLE_SET (glibc, cpu, hwcap_mask, uint64_t, hwcap_mask);
 #else
       GLRO(dl_hwcap_mask) = hwcap_mask;
 #endif
diff --git a/elf/dl-hwcaps.h b/elf/dl-hwcaps.h
index 17f0da4c73..d69ee11dc2 100644
--- a/elf/dl-hwcaps.h
+++ b/elf/dl-hwcaps.h
@@ -19,7 +19,7 @@
 #include <elf/dl-tunables.h>
 
 #if HAVE_TUNABLES
-# define GET_HWCAP_MASK() TUNABLE_GET (glibc, tune, hwcap_mask, uint64_t, NULL)
+# define GET_HWCAP_MASK() TUNABLE_GET (glibc, cpu, hwcap_mask, uint64_t, NULL)
 #else
 # ifdef SHARED
 #   define GET_HWCAP_MASK() GLRO(dl_hwcap_mask)
diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
index 1f8ecb8437..b108592b62 100644
--- a/elf/dl-tunables.list
+++ b/elf/dl-tunables.list
@@ -86,7 +86,7 @@ glibc {
       type: SIZE_T
     }
   }
-  tune {
+  cpu {
     hwcap_mask {
       type: UINT_64
       env_alias: LD_HWCAP_MASK
diff --git a/manual/README.tunables b/manual/README.tunables
index 3967679f43..f87a31a65e 100644
--- a/manual/README.tunables
+++ b/manual/README.tunables
@@ -105,11 +105,11 @@ where 'check' is the tunable name, 'int32_t' is the C type of the tunable and
 To get and set tunables in a different namespace from that module, use the full
 form of the macros as follows:
 
-  val = TUNABLE_GET_FULL (glibc, tune, hwcap_mask, uint64_t, NULL)
+  val = TUNABLE_GET_FULL (glibc, cpu, hwcap_mask, uint64_t, NULL)
 
-  TUNABLE_SET_FULL (glibc, tune, hwcap_mask, uint64_t, val)
+  TUNABLE_SET_FULL (glibc, cpu, hwcap_mask, uint64_t, val)
 
-where 'glibc' is the top namespace, 'tune' is the tunable namespace and the
+where 'glibc' is the top namespace, 'cpu' is the tunable namespace and the
 remaining arguments are the same as the short form macros.
 
 When TUNABLE_NAMESPACE is not defined in a module, TUNABLE_GET is equivalent to
diff --git a/manual/tunables.texi b/manual/tunables.texi
index bb4819bdf1..3345a23969 100644
--- a/manual/tunables.texi
+++ b/manual/tunables.texi
@@ -295,23 +295,23 @@ The default value of this tunable is @samp{3}.
 @cindex non_temporal_threshold tunables
 @cindex tunables, non_temporal_threshold
 
-@deftp {Tunable namespace} glibc.tune
+@deftp {Tunable namespace} glibc.cpu
 Behavior of @theglibc{} can be tuned to assume specific hardware capabilities
-by setting the following tunables in the @code{tune} namespace:
+by setting the following tunables in the @code{cpu} namespace:
 @end deftp
 
-@deftp Tunable glibc.tune.hwcap_mask
+@deftp Tunable glibc.cpu.hwcap_mask
 This tunable supersedes the @env{LD_HWCAP_MASK} environment variable and is
 identical in features.
 
 The @code{AT_HWCAP} key in the Auxiliary Vector specifies instruction set
 extensions available in the processor at runtime for some architectures.  The
-@code{glibc.tune.hwcap_mask} tunable allows the user to mask out those
+@code{glibc.cpu.hwcap_mask} tunable allows the user to mask out those
 capabilities at runtime, thus disabling use of those extensions.
 @end deftp
 
-@deftp Tunable glibc.tune.hwcaps
-The @code{glibc.tune.hwcaps=-xxx,yyy,-zzz...} tunable allows the user to
+@deftp Tunable glibc.cpu.hwcaps
+The @code{glibc.cpu.hwcaps=-xxx,yyy,-zzz...} tunable allows the user to
 enable CPU/ARCH feature @code{yyy}, disable CPU/ARCH feature @code{xxx}
 and @code{zzz} where the feature name is case-sensitive and has to match
 the ones in @code{sysdeps/x86/cpu-features.h}.
@@ -319,8 +319,8 @@ the ones in @code{sysdeps/x86/cpu-features.h}.
 This tunable is specific to i386 and x86-64.
 @end deftp
 
-@deftp Tunable glibc.tune.cached_memopt
-The @code{glibc.tune.cached_memopt=[0|1]} tunable allows the user to
+@deftp Tunable glibc.cpu.cached_memopt
+The @code{glibc.cpu.cached_memopt=[0|1]} tunable allows the user to
 enable optimizations recommended for cacheable memory.  If set to
 @code{1}, @theglibc{} assumes that the process memory image consists
 of cacheable (non-device) memory only.  The default, @code{0},
@@ -329,8 +329,8 @@ indicates that the process may use device memory.
 This tunable is specific to powerpc, powerpc64 and powerpc64le.
 @end deftp
 
-@deftp Tunable glibc.tune.cpu
-The @code{glibc.tune.cpu=xxx} tunable allows the user to tell @theglibc{} to
+@deftp Tunable glibc.cpu.name
+The @code{glibc.cpu.name=xxx} tunable allows the user to tell @theglibc{} to
 assume that the CPU is @code{xxx} where xxx may have one of these values:
 @code{generic}, @code{falkor}, @code{thunderxt88}, @code{thunderx2t99},
 @code{thunderx2t99p1}.
@@ -338,27 +338,27 @@ assume that the CPU is @code{xxx} where xxx may have one of these values:
 This tunable is specific to aarch64.
 @end deftp
 
-@deftp Tunable glibc.tune.x86_data_cache_size
-The @code{glibc.tune.x86_data_cache_size} tunable allows the user to set
+@deftp Tunable glibc.cpu.x86_data_cache_size
+The @code{glibc.cpu.x86_data_cache_size} tunable allows the user to set
 data cache size in bytes for use in memory and string routines.
 
 This tunable is specific to i386 and x86-64.
 @end deftp
 
-@deftp Tunable glibc.tune.x86_shared_cache_size
-The @code{glibc.tune.x86_shared_cache_size} tunable allows the user to
+@deftp Tunable glibc.cpu.x86_shared_cache_size
+The @code{glibc.cpu.x86_shared_cache_size} tunable allows the user to
 set shared cache size in bytes for use in memory and string routines.
 @end deftp
 
-@deftp Tunable glibc.tune.x86_non_temporal_threshold
-The @code{glibc.tune.x86_non_temporal_threshold} tunable allows the user
+@deftp Tunable glibc.cpu.x86_non_temporal_threshold
+The @code{glibc.cpu.x86_non_temporal_threshold} tunable allows the user
 to set threshold in bytes for non temporal store.
 
 This tunable is specific to i386 and x86-64.
 @end deftp
 
-@deftp Tunable glibc.tune.x86_ibt
-The @code{glibc.tune.x86_ibt} tunable allows the user to control how
+@deftp Tunable glibc.cpu.x86_ibt
+The @code{glibc.cpu.x86_ibt} tunable allows the user to control how
 indirect branch tracking (IBT) should be enabled.  Accepted values are
 @code{on}, @code{off}, and @code{permissive}.  @code{on} always turns
 on IBT regardless of whether IBT is enabled in the executable and its
@@ -370,8 +370,8 @@ IBT on non-CET executables and shared libraries.
 This tunable is specific to i386 and x86-64.
 @end deftp
 
-@deftp Tunable glibc.tune.x86_shstk
-The @code{glibc.tune.x86_shstk} tunable allows the user to control how
+@deftp Tunable glibc.cpu.x86_shstk
+The @code{glibc.cpu.x86_shstk} tunable allows the user to control how
 the shadow stack (SHSTK) should be enabled.  Accepted values are
 @code{on}, @code{off}, and @code{permissive}.  @code{on} always turns on
 SHSTK regardless of whether SHSTK is enabled in the executable and its
diff --git a/sysdeps/aarch64/dl-tunables.list b/sysdeps/aarch64/dl-tunables.list
index f6a88168cc..cfcf940ebd 100644
--- a/sysdeps/aarch64/dl-tunables.list
+++ b/sysdeps/aarch64/dl-tunables.list
@@ -17,8 +17,8 @@
 # <http://www.gnu.org/licenses/>.
 
 glibc {
-  tune {
-    cpu {
+  cpu {
+    name {
       type: STRING
     }
   }
diff --git a/sysdeps/powerpc/cpu-features.c b/sysdeps/powerpc/cpu-features.c
index 955d4778a6..ad809b9815 100644
--- a/sysdeps/powerpc/cpu-features.c
+++ b/sysdeps/powerpc/cpu-features.c
@@ -30,7 +30,7 @@ init_cpu_features (struct cpu_features *cpu_features)
      tunables is enable, since for this case user can explicit disable
      unaligned optimizations.  */
 #if HAVE_TUNABLES
-  int32_t cached_memfunc = TUNABLE_GET (glibc, tune, cached_memopt, int32_t,
+  int32_t cached_memfunc = TUNABLE_GET (glibc, cpu, cached_memopt, int32_t,
 					NULL);
   cpu_features->use_cached_memopt = (cached_memfunc > 0);
 #else
diff --git a/sysdeps/powerpc/dl-tunables.list b/sysdeps/powerpc/dl-tunables.list
index d26636a16b..b3372555f7 100644
--- a/sysdeps/powerpc/dl-tunables.list
+++ b/sysdeps/powerpc/dl-tunables.list
@@ -17,7 +17,7 @@
 # <http://www.gnu.org/licenses/>.
 
 glibc {
-  tune {
+  cpu {
     cached_memopt {
       type: INT_32
       minval: 0
diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index 39eba0186f..b4f348509e 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -57,7 +57,7 @@ init_cpu_features (struct cpu_features *cpu_features)
 
 #if HAVE_TUNABLES
   /* Get the tunable override.  */
-  const char *mcpu = TUNABLE_GET (glibc, tune, cpu, const char *, NULL);
+  const char *mcpu = TUNABLE_GET (glibc, cpu, name, const char *, NULL);
   if (mcpu != NULL)
     midr = get_midr_from_mcpu (mcpu);
 #endif
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index 337b0b63dc..f2fd031ac7 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -47,13 +47,13 @@ $(objpfx)tst-cet-legacy-4.out: $(objpfx)tst-cet-legacy-mod-4.so
 ifneq (no,$(have-tunables))
 $(objpfx)tst-cet-legacy-4a: $(libdl)
 $(objpfx)tst-cet-legacy-4a.out: $(objpfx)tst-cet-legacy-mod-4.so
-tst-cet-legacy-4a-ENV = GLIBC_TUNABLES=glibc.tune.x86_shstk=permissive
+tst-cet-legacy-4a-ENV = GLIBC_TUNABLES=glibc.cpu.x86_shstk=permissive
 $(objpfx)tst-cet-legacy-4b: $(libdl)
 $(objpfx)tst-cet-legacy-4b.out: $(objpfx)tst-cet-legacy-mod-4.so
-tst-cet-legacy-4b-ENV = GLIBC_TUNABLES=glibc.tune.x86_shstk=on
+tst-cet-legacy-4b-ENV = GLIBC_TUNABLES=glibc.cpu.x86_shstk=on
 $(objpfx)tst-cet-legacy-4c: $(libdl)
 $(objpfx)tst-cet-legacy-4c.out: $(objpfx)tst-cet-legacy-mod-4.so
-tst-cet-legacy-4c-ENV = GLIBC_TUNABLES=glibc.tune.x86_shstk=off
+tst-cet-legacy-4c-ENV = GLIBC_TUNABLES=glibc.cpu.x86_shstk=off
 endif
 endif
 
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 51642f8b6a..f4e0f5a2ed 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -22,7 +22,7 @@
 #include <libc-pointer-arith.h>
 
 #if HAVE_TUNABLES
-# define TUNABLE_NAMESPACE tune
+# define TUNABLE_NAMESPACE cpu
 # include <unistd.h>		/* Get STDOUT_FILENO for _dl_printf.  */
 # include <elf/dl-tunables.h>
 
@@ -419,7 +419,7 @@ no_cpuid:
 
   /* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86.  */
 #if !HAVE_TUNABLES && defined SHARED
-  /* The glibc.tune.hwcap_mask tunable is initialized already, so no need to do
+  /* The glibc.cpu.hwcap_mask tunable is initialized already, so no need to do
      this.  */
   GLRO(dl_hwcap_mask) = HWCAP_IMPORTANT;
 #endif
@@ -494,7 +494,7 @@ no_cpuid:
 	  /* Disable IBT and/or SHSTK if they are enabled by kernel, but
 	     disabled by environment variable:
 
-	     GLIBC_TUNABLES=glibc.tune.hwcaps=-IBT,-SHSTK
+	     GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
 	   */
 	  unsigned int cet_feature = 0;
 	  if (!HAS_CPU_FEATURE (IBT))
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 347a4b118d..4c6d08c709 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -141,7 +141,7 @@ struct cpu_features
   unsigned long int xsave_state_size;
   /* The full state size for XSAVE when XSAVEC is disabled by
 
-     GLIBC_TUNABLES=glibc.tune.hwcaps=-XSAVEC_Usable
+     GLIBC_TUNABLES=glibc.cpu.hwcaps=-XSAVEC_Usable
    */
   unsigned int xsave_state_full_size;
   unsigned int feature[FEATURE_INDEX_MAX];
diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c
index 69155a8f44..8e92358c67 100644
--- a/sysdeps/x86/cpu-tunables.c
+++ b/sysdeps/x86/cpu-tunables.c
@@ -17,7 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #if HAVE_TUNABLES
-# define TUNABLE_NAMESPACE tune
+# define TUNABLE_NAMESPACE cpu
 # include <stdbool.h>
 # include <stdint.h>
 # include <unistd.h>		/* Get STDOUT_FILENO for _dl_printf.  */
@@ -116,7 +116,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp)
      the hardware which wasn't available when the selection was made.
      The environment variable:
 
-     GLIBC_TUNABLES=glibc.tune.hwcaps=-xxx,yyy,-zzz,....
+     GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,-zzz,....
 
      can be used to enable CPU/ARCH feature yyy, disable CPU/ARCH feature
      yyy and zzz, where the feature name is case-sensitive and has to
diff --git a/sysdeps/x86/dl-cet.c b/sysdeps/x86/dl-cet.c
index b82ba14e75..78f36bcf53 100644
--- a/sysdeps/x86/dl-cet.c
+++ b/sysdeps/x86/dl-cet.c
@@ -128,7 +128,7 @@ dl_cet_check (struct link_map *m, const char *program)
 	  /* Enable IBT and SHSTK only if they are enabled in executable.
 	     NB: IBT and SHSTK may be disabled by environment variable:
 
-	     GLIBC_TUNABLES=glibc.tune.hwcaps=-IBT,-SHSTK
+	     GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
 	   */
 	  enable_ibt &= (HAS_CPU_FEATURE (IBT)
 			 && (enable_ibt_type == CET_ALWAYS_ON
diff --git a/sysdeps/x86/dl-tunables.list b/sysdeps/x86/dl-tunables.list
index 73886b1352..2a457d0eec 100644
--- a/sysdeps/x86/dl-tunables.list
+++ b/sysdeps/x86/dl-tunables.list
@@ -17,7 +17,7 @@
 # <http://www.gnu.org/licenses/>.
 
 glibc {
-  tune {
+  cpu {
     hwcaps {
       type: STRING
     }
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 9f1562f1b2..d51cf03ac9 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -57,7 +57,7 @@ modules-names += x86_64/tst-x86_64mod-1
 LDFLAGS-tst-x86_64mod-1.so = -Wl,-soname,tst-x86_64mod-1.so
 ifneq (no,$(have-tunables))
 # Test the state size for XSAVE when XSAVEC is disabled.
-tst-x86_64-1-ENV = GLIBC_TUNABLES=glibc.tune.hwcaps=-XSAVEC_Usable
+tst-x86_64-1-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-XSAVEC_Usable
 endif
 
 $(objpfx)tst-x86_64-1: $(objpfx)x86_64/tst-x86_64mod-1.so
@@ -74,7 +74,7 @@ $(objpfx)tst-platform-1.out: $(objpfx)x86_64/tst-platformmod-2.so
 # Turn off AVX512F_Usable and AVX2_Usable so that GLRO(dl_platform) is
 # always set to x86_64.
 tst-platform-1-ENV = LD_PRELOAD=$(objpfx)\$$PLATFORM/tst-platformmod-2.so \
-	GLIBC_TUNABLES=glibc.tune.hwcaps=-AVX512F_Usable,-AVX2_Usable
+	GLIBC_TUNABLES=glibc.cpu.hwcaps=-AVX512F_Usable,-AVX2_Usable
 endif
 
 tests += tst-audit3 tst-audit4 tst-audit5 tst-audit6 tst-audit7 \
-- 
2.17.1

