linux-kernel - [GIT PULL] s390 updates for 6.4-rc6

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Date:   Fri, 9 Jun 2023 14:44:17 +0200
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [GIT PULL] s390 updates for 6.4-rc6

Hello Linus,

please pull s390 changes for 6.4-rc6.

Thank you,
Alexander

The following changes since commit 0f1cbf941d5949110adf70725a9614e622de8d99:

  s390/iommu: get rid of S390_CCW_IOMMU and S390_AP_IOMMU (2023-05-01 14:11:28 -0300)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git tags/s390-6.4-3

for you to fetch changes up to 03c5c83b70dca3729a3eb488e668e5044bd9a5ea:

  s390/purgatory: disable branch profiling (2023-05-25 19:41:45 +0200)

----------------------------------------------------------------
s390 updates for 6.4-rc6

- Avoid linker error for randomly generated config file that                  
  has CONFIG_BRANCH_PROFILE_NONE enabled and make it similar                  
  to riscv, x86 and also to commit 4bf3ec384edf ("s390: disable               
  branch profiling for vdso").                                                

- Currently, if the device is offline and all the channel paths are           
  either configured or varied offline, the associated subchannel gets         
  unregistered. Don't unregister the subchannel, instead unregister           
  offline device.                                                             

----------------------------------------------------------------
Alexander Gordeev (1):
  s390/purgatory: disable branch profiling

Vineeth Vijayan (1):
  s390/cio: unregister device when the only path is gone

 arch/s390/purgatory/Makefile | 1 +
 drivers/s390/cio/device.c    | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/s390/purgatory/Makefile b/arch/s390/purgatory/Makefile
index 32573b4f9bd2..cc8cf5abea15 100644
--- a/arch/s390/purgatory/Makefile
+++ b/arch/s390/purgatory/Makefile
@@ -26,6 +26,7 @@ KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
 KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
 KBUILD_CFLAGS += -Os -m64 -msoft-float -fno-common
 KBUILD_CFLAGS += -fno-stack-protector
+KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 KBUILD_CFLAGS += $(CLANG_FLAGS)
 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
 KBUILD_AFLAGS := $(filter-out -DCC_USING_EXPOLINE,$(KBUILD_AFLAGS))
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index d5c43e9b5128..c0d620ffea61 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1376,6 +1376,7 @@ void ccw_device_set_notoper(struct ccw_device *cdev)
 enum io_sch_action {
 	IO_SCH_UNREG,
 	IO_SCH_ORPH_UNREG,
+	IO_SCH_UNREG_CDEV,
 	IO_SCH_ATTACH,
 	IO_SCH_UNREG_ATTACH,
 	IO_SCH_ORPH_ATTACH,
@@ -1408,7 +1409,7 @@ static enum io_sch_action sch_get_action(struct subchannel *sch)
 	}
 	if ((sch->schib.pmcw.pam & sch->opm) == 0) {
 		if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
-			return IO_SCH_UNREG;
+			return IO_SCH_UNREG_CDEV;
 		return IO_SCH_DISC;
 	}
 	if (device_is_disconnected(cdev))
@@ -1470,6 +1471,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 	case IO_SCH_ORPH_ATTACH:
 		ccw_device_set_disconnected(cdev);
 		break;
+	case IO_SCH_UNREG_CDEV:
 	case IO_SCH_UNREG_ATTACH:
 	case IO_SCH_UNREG:
 		if (!cdev)
@@ -1503,6 +1505,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 		if (rc)
 			goto out;
 		break;
+	case IO_SCH_UNREG_CDEV:
 	case IO_SCH_UNREG_ATTACH:
 		spin_lock_irqsave(sch->lock, flags);
 		sch_set_cdev(sch, NULL);