Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Heiko Carstens:
 "The main thing in this merge is the defense for the Spectre
  vulnerabilities. But there are other updates as well, the changes in
  more detail:

   - An s390 specific implementation of the array_index_mask_nospec
     function to the defense against spectre v1

   - Two patches to utilize the new PPA-12/PPA-13 instructions to run
     the kernel and/or user space with reduced branch predicton.

   - The s390 variant of the 'retpoline' spectre v2 defense called
     'expoline'. There is no return instruction for s390, instead an
     indirect branch is used for function return

     The s390 defense mechanism for indirect branches works by using an
     execute-type instruction with the indirect branch as the target of
     the execute. In effect that turns off the prediction for the
     indirect branch.

   - Scrub registers in entry.S that contain user controlled values to
     prevent the speculative use of these values.

   - Re-add the second parameter for the s390 specific runtime
     instrumentation system call and move the header file to uapi. The
     second parameter will continue to do nothing but older kernel
     versions only accepted valid real-time signal numbers. The details
     will be documented in the man-page for the system call.

   - Corrections and improvements for the s390 specific documentation

   - Add a line to /proc/sysinfo to display the CPU model dependent
     license-internal-code identifier

   - A header file include fix for eadm.

   - An error message fix in the kprobes code.

   - The removal of an outdated ARCH_xxx select statement"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/kconfig: Remove ARCH_WANTS_PROT_NUMA_PROT_NONE select
  s390: introduce execute-trampolines for branches
  s390: run user space and KVM guests with modified branch prediction
  s390: add options to change branch prediction behaviour for the kernel
  s390/alternative: use a copy of the facility bit mask
  s390: add optimized array_index_mask_nospec
  s390: scrub registers on kernel entry and KVM exit
  s390/cio: fix kernel-doc usage
  s390/runtime_instrumentation: re-add signum system call parameter
  s390/cpum_cf: correct counter number of LAST_HOST_TRANSLATIONS
  s390/kprobes: Fix %p uses in error messages
  s390/runtime instrumentation: provide uapi header file
  s390/sysinfo: add and display licensed internal code identifier
  s390/docs: reword airq section
  s390/docs: mention subchannel types
  s390/cmf: fix kerneldoc
  s390/eadm: fix CONFIG_BLOCK include dependency

7 files changed, 19 insertions, 18 deletions

diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index 614b44e70a28..a2b33a22c82a 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -19,6 +19,8 @@ endif
 
 CFLAGS_sclp_early_core.o		+= -D__NO_FORTIFY
 
+CFLAGS_REMOVE_sclp_early_core.o	+= $(CC_FLAGS_EXPOLINE)
+
 obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
 	 sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o sclp_ctl.o \
 	 sclp_early.o sclp_early_core.o
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 5c94a3aec4dd..f95b452b8bbc 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -412,7 +412,7 @@ static void chp_release(struct device *dev)
 
 /**
  * chp_update_desc - update channel-path description
- * @chp - channel-path
+ * @chp: channel-path
  *
  * Update the channel-path description of the specified channel-path
  * including channel measurement related information.
@@ -438,7 +438,7 @@ int chp_update_desc(struct channel_path *chp)
 
 /**
  * chp_new - register a new channel-path
- * @chpid - channel-path ID
+ * @chpid: channel-path ID
  *
  * Create and register data structure representing new channel-path. Return
  * zero on success, non-zero otherwise.
@@ -730,8 +730,8 @@ static void cfg_func(struct work_struct *work)
 
 /**
  * chp_cfg_schedule - schedule chpid configuration request
- * @chpid - channel-path ID
- * @configure - Non-zero for configure, zero for deconfigure
+ * @chpid: channel-path ID
+ * @configure: Non-zero for configure, zero for deconfigure
  *
  * Schedule a channel-path configuration/deconfiguration request.
  */
@@ -747,7 +747,7 @@ void chp_cfg_schedule(struct chp_id chpid, int configure)
 
 /**
  * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request
- * @chpid - channel-path ID
+ * @chpid: channel-path ID
  *
  * Cancel an active channel-path deconfiguration request if it has not yet
  * been performed.
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 987bf9a8c9f7..6886b3d34cf8 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -1059,7 +1059,7 @@ EXPORT_SYMBOL_GPL(cio_tm_start_key);
 
 /**
  * cio_tm_intrg - perform interrogate function
- * @sch - subchannel on which to perform the interrogate function
+ * @sch: subchannel on which to perform the interrogate function
  *
  * If the specified subchannel is running in transport-mode, perform the
  * interrogate function. Return zero on success, non-zero otherwie.
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 5e495c62cfa7..8af4948dae80 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1118,9 +1118,10 @@ int ccw_set_cmf(struct ccw_device *cdev, int enable)
  * enable_cmf() - switch on the channel measurement for a specific device
  *  @cdev:	The ccw device to be enabled
  *
- *  Returns %0 for success or a negative error value.
- *  Note: If this is called on a device for which channel measurement is already
- *	  enabled a reset of the measurement data is triggered.
+ *  Enable channel measurements for @cdev. If this is called on a device
+ *  for which channel measurement is already enabled a reset of the
+ *  measurement data is triggered.
+ *  Returns: %0 for success or a negative error value.
  *  Context:
  *    non-atomic
  */
@@ -1160,7 +1161,7 @@ out_unlock:
  * __disable_cmf() - switch off the channel measurement for a specific device
  *  @cdev:	The ccw device to be disabled
  *
- *  Returns %0 for success or a negative error value.
+ *  Returns: %0 for success or a negative error value.
  *
  *  Context:
  *    non-atomic, device_lock() held.
@@ -1184,7 +1185,7 @@ int __disable_cmf(struct ccw_device *cdev)
  * disable_cmf() - switch off the channel measurement for a specific device
  *  @cdev:	The ccw device to be disabled
  *
- *  Returns %0 for success or a negative error value.
+ *  Returns: %0 for success or a negative error value.
  *
  *  Context:
  *    non-atomic
@@ -1205,7 +1206,7 @@ int disable_cmf(struct ccw_device *cdev)
  * @cdev:	the channel to be read
  * @index:	the index of the value to be read
  *
- * Returns the value read or %0 if the value cannot be read.
+ * Returns: The value read or %0 if the value cannot be read.
  *
  *  Context:
  *    any
@@ -1220,7 +1221,7 @@ u64 cmf_read(struct ccw_device *cdev, int index)
  * @cdev:	the channel to be read
  * @data:	a pointer to a data block that will be filled
  *
- * Returns %0 on success, a negative error value otherwise.
+ * Returns: %0 on success, a negative error value otherwise.
  *
  *  Context:
  *    any
diff --git a/drivers/s390/cio/itcw.c b/drivers/s390/cio/itcw.c
index deaf59f93326..19e46363348c 100644
--- a/drivers/s390/cio/itcw.c
+++ b/drivers/s390/cio/itcw.c
@@ -15,7 +15,7 @@
 #include <asm/fcx.h>
 #include <asm/itcw.h>
 
-/**
+/*
  * struct itcw - incremental tcw helper data type
  *
  * This structure serves as a handle for the incremental construction of a
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 95b0efe28afb..d5b02de02a3a 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -72,6 +72,7 @@ static inline int do_siga_input(unsigned long schid, unsigned int mask,
  * @mask: which output queues to process
  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  * @fc: function code to perform
+ * @aob: asynchronous operation block
  *
  * Returns condition code.
  * Note: For IQDC unicast queues only the highest priority queue is processed.
@@ -1761,9 +1762,6 @@ EXPORT_SYMBOL(qdio_stop_irq);
  * @response:		Response code will be stored at this address
  * @cb: 		Callback function will be executed for each element
  *			of the address list
- * @priv:		Pointer passed from the caller to qdio_pnso_brinfo()
- * @type:		Type of the address entry passed to the callback
- * @entry:		Entry containg the address of the specified type
  * @priv:		Pointer to pass to the callback function.
  *
  * Performs "Store-network-bridging-information list" operation and calls
diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index d9a2fffd034b..2c7550797ec2 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -835,7 +835,7 @@ void cp_update_scsw(struct channel_program *cp, union scsw *scsw)
 
 /**
  * cp_iova_pinned() - check if an iova is pinned for a ccw chain.
- * @cmd: ccwchain command on which to perform the operation
+ * @cp: channel_program on which to perform the operation
  * @iova: the iova to check
  *
  * If the @iova is currently pinned for the ccw chain, return true;