Merge tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik:

 - Add support for ftrace with direct call and ftrace direct call
   samples.

 - Add support for kernel command lines longer than current 896 bytes
   and make its length configurable.

 - Add support for BEAR enhancement facility to improve last breaking
   event instruction tracking.

 - Add kprobes sanity checks and testcases to prevent kprobe in the mid
   of an instruction.

 - Allow concurrent access to /dev/hwc for the CPUMF users.

 - Various ftrace / jump label improvements.

 - Convert unwinder tests to KUnit.

 - Add s390_iommu_aperture kernel parameter to tweak the limits on
   concurrently usable DMA mappings.

 - Add ap.useirq AP module option which can be used to disable interrupt
   use.

 - Add add_disk() error handling support to block device drivers.

 - Drop arch specific and use generic implementation of strlcpy and
   strrchr.

 - Several __pa/__va usages fixes.

 - Various cio, crypto, pci, kernel doc and other small fixes and
   improvements all over the code.

[ Merge fixup as per https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ ]

* tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (63 commits)
  s390: make command line configurable
  s390: support command lines longer than 896 bytes
  s390/kexec_file: move kernel image size check
  s390/pci: add s390_iommu_aperture kernel parameter
  s390/spinlock: remove incorrect kernel doc indicator
  s390/string: use generic strlcpy
  s390/string: use generic strrchr
  s390/ap: function rework based on compiler warning
  s390/cio: make ccw_device_dma_* more robust
  s390/vfio-ap: s390/crypto: fix all kernel-doc warnings
  s390/hmcdrv: fix kernel doc comments
  s390/ap: new module option ap.useirq
  s390/cpumf: Allow multiple processes to access /dev/hwc
  s390/bitops: return true/false (not 1/0) from bool functions
  s390: add support for BEAR enhancement facility
  s390: introduce nospec_uses_trampoline()
  s390: rename last_break to pgm_last_break
  s390/ptrace: add last_break member to pt_regs
  s390/sclp: sort out physical vs virtual pointers usage
  s390/setup: convert start and end initrd pointers to virtual
  ...

1 files changed, 14 insertions, 10 deletions

diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
index f9eddbca79d2..2c057e1f3200 100644
--- a/arch/s390/include/asm/barrier.h
+++ b/arch/s390/include/asm/barrier.h
@@ -16,20 +16,24 @@
 
 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
 /* Fast-BCR without checkpoint synchronization */
-#define __ASM_BARRIER "bcr 14,0\n"
+#define __ASM_BCR_SERIALIZE "bcr 14,0\n"
 #else
-#define __ASM_BARRIER "bcr 15,0\n"
+#define __ASM_BCR_SERIALIZE "bcr 15,0\n"
 #endif
 
-#define mb() do {  asm volatile(__ASM_BARRIER : : : "memory"); } while (0)
+static __always_inline void bcr_serialize(void)
+{
+	asm volatile(__ASM_BCR_SERIALIZE : : : "memory");
+}
 
-#define rmb()				barrier()
-#define wmb()				barrier()
-#define dma_rmb()			mb()
-#define dma_wmb()			mb()
-#define __smp_mb()			mb()
-#define __smp_rmb()			rmb()
-#define __smp_wmb()			wmb()
+#define mb()		bcr_serialize()
+#define rmb()		barrier()
+#define wmb()		barrier()
+#define dma_rmb()	mb()
+#define dma_wmb()	mb()
+#define __smp_mb()	mb()
+#define __smp_rmb()	rmb()
+#define __smp_wmb()	wmb()
 
 #define __smp_store_release(p, v)					\
 do {									\