Merge branch 'rickard/non-smp-removal-cleanup/OTP-14518'

* rickard/non-smp-removal-cleanup/OTP-14518:
  erts: Cleanup erl and erlang docs after non-smp removal
  erts: Remove unused prototypes after non-smp removal

4 files changed, 24 insertions, 136 deletions

diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 638e88ca31..71fe08d4e6 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -538,20 +538,6 @@
         <p>Note that a distributed node will fail to start if epmd is
           not running.</p>
       </item>
-      <tag><marker id="smp"/><c><![CDATA[-smp [enable|auto|disable]]]></c></tag>
-      <item>
-        <p><c>-smp enable</c> and <c>-smp</c> start the Erlang runtime
-	  system with SMP support enabled. This can fail if no runtime
-	  system with SMP support is available. <c>-smp auto</c> starts
-	  the Erlang runtime system with SMP support enabled if it is
-	  available and more than one logical processor is detected.
-	  <c>-smp disable</c> starts a runtime system without SMP support.
-           The runtime system without SMP support is deprecated and will
-           be removed in a future major release.</p>
-        <note>
-          <p>See also flag<seealso marker="#+S"><c>+S</c></seealso>.</p>
-        </note>
-      </item>
       <tag><c><![CDATA[-version]]></c> (emulator flag)</tag>
       <item>
         <p>Makes the emulator print its version number. The same
@@ -902,7 +888,7 @@
         <c><![CDATA[+S Schedulers:SchedulerOnline]]></c></tag>
       <item>
         <p>Sets the number of scheduler threads to create and scheduler threads
-          to set online when SMP support has been enabled. The maximum for both
+          to set online. The maximum for both
           values is 1024. If the Erlang runtime system is able to determine the
           number of logical processors configured and logical processors
           available, <c>Schedulers</c> defaults to logical processors
@@ -920,8 +906,6 @@
         <p>Specifying value <c>0</c> for <c>Schedulers</c> or
           <c>SchedulersOnline</c> resets the number of scheduler threads or
           scheduler threads online, respectively, to its default value.</p>
-        <p>This option is ignored if the emulator does not have SMP support
-          enabled (see flag <seealso marker="#smp"><c>-smp</c></seealso>).</p>
       </item>
       <tag><marker id="+SP"/><c><![CDATA[+SP
         SchedulersPercentage:SchedulersOnlinePercentage]]></c></tag>
@@ -929,8 +913,8 @@
         <p>Similar to <seealso marker="#+S"><c>+S</c></seealso> but uses
           percentages to set the number of scheduler threads to create, based
           on logical processors configured, and scheduler threads to set online,
-          based on logical processors available, when SMP support has been
-          enabled. Specified values must be &gt; 0. For example,
+          based on logical processors available.
+          Specified values must be &gt; 0. For example,
           <c>+SP 50:25</c> sets the number of scheduler threads to 50% of the
           logical processors configured, and the number of scheduler threads
           online to 25% of the logical processors available.
@@ -945,15 +929,13 @@
           and 8 logical cores available, the combination of the options
           <c>+S 4:4 +SP 50:25</c> (in either order) results in 2 scheduler
           threads (50% of 4) and 1 scheduler thread online (25% of 4).</p>
-        <p>This option is ignored if the emulator does not have SMP support
-          enabled (see flag <seealso marker="#smp"><c>-smp</c></seealso>).</p>
       </item>
       <tag><marker id="+SDcpu"/><c><![CDATA[+SDcpu
         DirtyCPUSchedulers:DirtyCPUSchedulersOnline]]></c></tag>
       <item>
         <p>Sets the number of dirty CPU scheduler threads to create and dirty
-          CPU scheduler threads to set online when threading support has been
-          enabled. The maximum for both values is 1024, and each value is
+          CPU scheduler threads to set online.
+          The maximum for both values is 1024, and each value is
           further limited by the settings for normal schedulers:</p>
         <list type="bulleted">
           <item>The number of dirty CPU scheduler threads created cannot exceed
@@ -977,16 +959,14 @@
 	  executing on ordinary schedulers. If the amount of dirty CPU
 	  schedulers was allowed to be unlimited, dirty CPU bound jobs would
 	  potentially starve normal jobs.</p>
-        <p>This option is ignored if the emulator does not have threading
-          support enabled.</p>
       </item>
       <tag><marker id="+SDPcpu"/><c><![CDATA[+SDPcpu
         DirtyCPUSchedulersPercentage:DirtyCPUSchedulersOnlinePercentage]]></c></tag>
       <item>
         <p>Similar to <seealso marker="#+SDcpu"><c>+SDcpu</c></seealso> but
           uses percentages to set the number of dirty CPU scheduler threads to
-          create and the number of dirty CPU scheduler threads to set online
-          when threading support has been enabled. Specified values must be
+          create and the number of dirty CPU scheduler threads to set online.
+          Specified values must be
           &gt; 0. For example, <c>+SDPcpu 50:25</c> sets the number of dirty
           CPU scheduler threads to 50% of the logical processors configured
           and the number of dirty CPU scheduler threads online to 25% of the
@@ -1003,13 +983,11 @@
           the combination of the options <c>+SDcpu 4:4 +SDPcpu 50:25</c> (in
           either order) results in 2 dirty CPU scheduler threads (50% of 4) and
           1 dirty CPU scheduler thread online (25% of 4).</p>
-        <p>This option is ignored if the emulator does not have threading
-          support enabled.</p>
       </item>
       <tag><marker id="+SDio"/><c><![CDATA[+SDio DirtyIOSchedulers]]></c></tag>
       <item>
-        <p>Sets the number of dirty I/O scheduler threads to create when
-          threading support has been enabled. Valid range is 0-1024. By
+        <p>Sets the number of dirty I/O scheduler threads to create.
+          Valid range is 0-1024. By
           default, the number of dirty I/O scheduler threads created is 10,
           same as the default number of threads in the <seealso
           marker="#async_thread_pool_size">async thread pool</seealso>.</p>
@@ -1019,8 +997,6 @@
 	  expected to execute on dirty I/O schedulers. If the user should schedule CPU
 	  bound jobs on dirty I/O schedulers, these jobs might starve ordinary
 	  jobs executing on ordinary schedulers.</p>
-        <p>This option is ignored if the emulator does not have threading
-          support enabled.</p>
       </item>
       <tag><c><![CDATA[+sFlag Value]]></c></tag>
       <item>
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 105734d5b2..ba4e07b158 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -4284,7 +4284,6 @@ RealSystem = system + MissedSystem</code>
       <desc>
         <p><c><anno>Locking</anno></c> is one of the following:</p>
         <list type="bulleted">
-          <item><c>false</c> (emulator without SMP support)</item>
           <item><c>port_level</c> (port-specific locking)</item>
           <item><c>driver_level</c> (driver-specific locking)</item>
         </list>
@@ -4688,8 +4687,8 @@ RealSystem = system + MissedSystem</code>
           selected for execution. Notice however that this does
           <em>not</em> mean that no processes on priority <c>low</c>
           or <c>normal</c> can run when processes
-          are running on priority <c>high</c>. On the runtime
-          system with SMP support, more processes can be running
+          are running on priority <c>high</c>. When using multiple
+          schedulers, more processes can be running
           in parallel than processes on priority <c>high</c>. That is,
           a <c>low</c> and a <c>high</c> priority process can
           execute at the same time.</p>
@@ -4704,10 +4703,8 @@ RealSystem = system + MissedSystem</code>
           execution.</p>
         <note>
           <p>Do not depend on the scheduling
-          to remain exactly as it is today. Scheduling, at least on
-          the runtime system with SMP support, is likely to be
-          changed in a future release to use available
-          processor cores better.</p>
+          to remain exactly as it is today. Scheduling is likely to be
+          changed in a future release to use available processor cores better.</p>
         </note>
         <p>There is <em>no</em> automatic mechanism for
           avoiding priority inversion, such as priority inheritance
@@ -6219,8 +6216,7 @@ true</pre>
           <p><c>statistics(exact_reductions)</c> is
             a more expensive operation than
             <seealso marker="#statistics_reductions">
-            statistics(reductions)</seealso>,
-            especially on an Erlang machine with SMP support.</p>
+            statistics(reductions)</seealso>.</p>
         </note>
       </desc>
     </func>
@@ -6604,8 +6600,8 @@ ok
 	than available logical processors, this value may
 	be greater than <c>1.0</c>.</p>
 	<p>As of ERTS version 9.0, the Erlang runtime system
-	with SMP support will as default have more schedulers
-	than logical processors. This due to the dirty schedulers.</p>
+        will as default have more schedulers than logical processors.
+        This due to the dirty schedulers.</p>
         <note>
           <p><c>scheduler_wall_time</c> is by default disabled. To
             enable it, use
@@ -7975,9 +7971,7 @@ ok
             <taglist>
               <tag><c>disabled</c></tag>
               <item>
-                <p>The emulator has only one scheduler thread. The
-                  emulator does not have SMP support, or have been
-                  started with only one scheduler thread.</p>
+                <p>The emulator has been started with only one scheduler thread.</p>
               </item>
               <tag><c>blocked</c></tag>
               <item>
@@ -8340,8 +8334,7 @@ ok
           </item>
           <tag><c>smp_support</c></tag>
           <item>
-            <p>Returns <c>true</c> if the emulator has been compiled
-              with SMP support, otherwise <c>false</c> is returned.</p>
+            <p>Returns <c>true</c>.</p>
           </item>
           <tag><marker id="system_info_start_time"/><c>start_time</c></tag>
           <item>
@@ -8364,8 +8357,7 @@ ok
           </item>
           <tag><c>threads</c></tag>
           <item>
-            <p>Returns <c>true</c> if the emulator has been compiled
-              with thread support, otherwise <c>false</c> is returned.</p>
+            <p>Returns <c>true</c>.</p>
           </item>
           <tag><c>thread_pool_size</c></tag>
           <item>
@@ -10484,9 +10476,9 @@ true</pre>
           <c>receive after 1 -> ok end</c>, except that <c>yield()</c>
           is faster.</p>
         <warning>
-          <p>There is seldom or never any need to use this BIF,
-            especially in the SMP emulator, as other processes have a
-            chance to run in another scheduler thread anyway.
+          <p>There is seldom or never any need to use this BIF
+            as other processes have a chance to run in another scheduler
+            thread anyway.
             Using this BIF without a thorough grasp of how the scheduler
             works can cause performance degradation.</p>
         </warning>
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml
index ff7d593edb..985ea11b49 100644
--- a/erts/doc/src/notes.xml
+++ b/erts/doc/src/notes.xml
@@ -3493,8 +3493,7 @@
 	    <p>The previously introduced "eager check I/O" feature is
 	    now enabled by default.</p>
 	    <p>Eager check I/O can be disabled using the <c>erl</c>
-	    command line argument: <seealso
-	    marker="erl#+secio"><c>+secio false</c></seealso></p>
+	    command line argument: <c>+secio false</c></p>
 	    <p>Characteristics impact compared to previous
 	    default:</p> <list> <item>Lower latency and smoother
 	    management of externally triggered I/O operations.</item>
@@ -4275,8 +4274,7 @@
 	    prioritized to the same extent as when eager check I/O is
 	    disabled.</p>
 	    <p>Eager check I/O can be enabled using the <c>erl</c>
-	    command line argument: <seealso
-	    marker="erl#+secio"><c>+secio true</c></seealso></p>
+	    command line argument: <c>+secio true</c></p>
 	    <p>Characteristics impact when enabled:</p> <list>
 	    <item>Lower latency and smoother management of externally
 	    triggered I/O operations.</item> <item>A slightly reduced
diff --git a/erts/emulator/beam/erl_threads.h b/erts/emulator/beam/erl_threads.h
index ffb1f72200..e306df818d 100644
--- a/erts/emulator/beam/erl_threads.h
+++ b/erts/emulator/beam/erl_threads.h
@@ -385,12 +385,6 @@ __decl_noreturn void  __noreturn erts_thr_fatal_error(int, char *);
 #  define ERTS_HAVE_REC_MTX_INIT	ETHR_HAVE_ETHR_REC_MUTEX_INIT
 #endif
 
-
-#define erts_no_dw_atomic_t erts_dw_aint_t
-#define erts_no_atomic_t erts_aint_t
-#define erts_no_atomic32_t erts_aint32_t
-#define erts_no_atomic64_t erts_aint64_t
-
 #define ERTS_AINT_NULL ((erts_aint_t) NULL)
 
 #define ERTS_AINT_T_MAX (~(((erts_aint_t) 1) << (sizeof(erts_aint_t)*8-1)))
@@ -461,78 +455,6 @@ ERTS_GLB_INLINE void erts_rwmtx_rwunlock(erts_rwmtx_t *rwmtx);
 ERTS_GLB_INLINE int erts_lc_rwmtx_is_rlocked(erts_rwmtx_t *mtx);
 ERTS_GLB_INLINE int erts_lc_rwmtx_is_rwlocked(erts_rwmtx_t *mtx);
 
-ERTS_GLB_INLINE void erts_no_dw_atomic_set(erts_no_dw_atomic_t *var, erts_no_dw_atomic_t *val);
-ERTS_GLB_INLINE void erts_no_dw_atomic_read(erts_no_dw_atomic_t *var, erts_no_dw_atomic_t *val);
-ERTS_GLB_INLINE int erts_no_dw_atomic_cmpxchg(erts_no_dw_atomic_t *var,
-					      erts_no_dw_atomic_t *val,
-					      erts_no_dw_atomic_t *old_val);
-ERTS_GLB_INLINE void erts_no_atomic_set(erts_no_atomic_t *var, erts_aint_t i);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_read(erts_no_atomic_t *var);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_inc_read(erts_no_atomic_t *incp);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_dec_read(erts_no_atomic_t *decp);
-ERTS_GLB_INLINE void erts_no_atomic_inc(erts_no_atomic_t *incp);
-ERTS_GLB_INLINE void erts_no_atomic_dec(erts_no_atomic_t *decp);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_add_read(erts_no_atomic_t *addp,
-						    erts_aint_t i);
-ERTS_GLB_INLINE void erts_no_atomic_add(erts_no_atomic_t *addp, erts_aint_t i);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_read_bor(erts_no_atomic_t *var,
-						    erts_aint_t mask);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_read_band(erts_no_atomic_t *var,
-						     erts_aint_t mask);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_xchg(erts_no_atomic_t *xchgp,
-						erts_aint_t new);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_cmpxchg(erts_no_atomic_t *xchgp,
-						   erts_aint_t new,
-						   erts_aint_t expected);
-ERTS_GLB_INLINE erts_aint_t erts_no_atomic_read_bset(erts_no_atomic_t *var,
-						     erts_aint_t mask,
-						     erts_aint_t set);
-ERTS_GLB_INLINE void erts_no_atomic32_set(erts_no_atomic32_t *var,
-					  erts_aint32_t i);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_read(erts_no_atomic32_t *var);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_inc_read(erts_no_atomic32_t *incp);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_dec_read(erts_no_atomic32_t *decp);
-ERTS_GLB_INLINE void erts_no_atomic32_inc(erts_no_atomic32_t *incp);
-ERTS_GLB_INLINE void erts_no_atomic32_dec(erts_no_atomic32_t *decp);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_add_read(erts_no_atomic32_t *addp,
-							erts_aint32_t i);
-ERTS_GLB_INLINE void erts_no_atomic32_add(erts_no_atomic32_t *addp,
-					  erts_aint32_t i);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_read_bor(erts_no_atomic32_t *var,
-							erts_aint32_t mask);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_read_band(erts_no_atomic32_t *var,
-							 erts_aint32_t mask);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_xchg(erts_no_atomic32_t *xchgp,
-						    erts_aint32_t new);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_cmpxchg(erts_no_atomic32_t *xchgp,
-						       erts_aint32_t new,
-						       erts_aint32_t expected);
-ERTS_GLB_INLINE erts_aint32_t erts_no_atomic32_read_bset(erts_no_atomic32_t *var,
-							 erts_aint32_t mask,
-							 erts_aint32_t set);
-ERTS_GLB_INLINE void erts_no_atomic64_set(erts_no_atomic64_t *var,
-					  erts_aint64_t i);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_read(erts_no_atomic64_t *var);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_inc_read(erts_no_atomic64_t *incp);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_dec_read(erts_no_atomic64_t *decp);
-ERTS_GLB_INLINE void erts_no_atomic64_inc(erts_no_atomic64_t *incp);
-ERTS_GLB_INLINE void erts_no_atomic64_dec(erts_no_atomic64_t *decp);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_add_read(erts_no_atomic64_t *addp,
-							erts_aint64_t i);
-ERTS_GLB_INLINE void erts_no_atomic64_add(erts_no_atomic64_t *addp,
-					  erts_aint64_t i);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_read_bor(erts_no_atomic64_t *var,
-							erts_aint64_t mask);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_read_band(erts_no_atomic64_t *var,
-							 erts_aint64_t mask);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_xchg(erts_no_atomic64_t *xchgp,
-						    erts_aint64_t new);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_cmpxchg(erts_no_atomic64_t *xchgp,
-						       erts_aint64_t new,
-						       erts_aint64_t expected);
-ERTS_GLB_INLINE erts_aint64_t erts_no_atomic64_read_bset(erts_no_atomic64_t *var,
-							 erts_aint64_t mask,
-							 erts_aint64_t set);
 ERTS_GLB_INLINE void erts_spinlock_init(erts_spinlock_t *lock,
                                         char *name,
                                         Eterm extra,