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

author: Mark Brown <broonie@kernel.org> 2026-05-29 18:09:26 +0100
committer: Mark Brown <broonie@kernel.org> 2026-05-29 18:09:26 +0100
commit: 6a2f8c339e219a7e4d9939f54c9bba8625c5fa58 (patch)
tree: d29b606f59ebc13fc04067affa99833d0c3cb0ab /arch
parent: 25d928ed202826ffe8ee0f7944b80be922c5d081 (diff)
parent: 6f2bf64ba8ad6f8ea4f2b2207952814d9f3edcc2 (diff)
download: linux-next-history-6a2f8c339e219a7e4d9939f54c9bba8625c5fa58.tar.gz
14 files changed, 162 insertions, 38 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index ecbcbb781e40a..771f738fe8bda 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -179,6 +179,7 @@ config S390
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL
 	select GENERIC_IOREMAP if PCI
+	select GLOB
 	select HAVE_ALIGNED_STRUCT_PAGE
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_GET_SECUREBOOT
@@ -999,9 +1000,8 @@ config S390_MODULES_SANITY_TEST_HELPERS
 menu "Selftests"
 
 config S390_UNWIND_SELFTEST
-	def_tristate n
+	def_tristate KUNIT_ALL_TESTS
 	depends on KUNIT
-	default KUNIT_ALL_TESTS
 	prompt "Test unwind functions"
 	help
 	  This option enables s390 specific stack unwinder testing kernel
@@ -1011,7 +1011,7 @@ config S390_UNWIND_SELFTEST
 	  Say N if you are unsure.
 
 config S390_KPROBES_SANITY_TEST
-	def_tristate n
+	def_tristate KUNIT_ALL_TESTS
 	prompt "Enable s390 specific kprobes tests"
 	depends on KPROBES
 	depends on KUNIT
@@ -1023,9 +1023,8 @@ config S390_KPROBES_SANITY_TEST
 	  Say N if you are unsure.
 
 config S390_MODULES_SANITY_TEST
-	def_tristate n
+	def_tristate KUNIT_ALL_TESTS
 	depends on KUNIT && m
-	default KUNIT_ALL_TESTS
 	prompt "Enable s390 specific modules tests"
 	select S390_MODULES_SANITY_TEST_HELPERS
 	help
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index edbedbb2a773a..9cba4633c3f3b 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -51,7 +51,6 @@ static int appldata_timer_handler(const struct ctl_table *ctl, int write,
 static int appldata_interval_handler(const struct ctl_table *ctl, int write,
 				     void *buffer, size_t *lenp, loff_t *ppos);
 
-static struct ctl_table_header *appldata_sysctl_header;
 static const struct ctl_table appldata_table[] = {
 	{
 		.procname	= "timer",
@@ -406,7 +405,7 @@ static int __init appldata_init(void)
 	appldata_wq = alloc_ordered_workqueue("appldata", 0);
 	if (!appldata_wq)
 		return -ENOMEM;
-	appldata_sysctl_header = register_sysctl(appldata_proc_name, appldata_table);
+	register_sysctl(appldata_proc_name, appldata_table);
 	return 0;
 }
 
diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
index dad02f5b3c8d3..d1e4201f38506 100644
--- a/arch/s390/include/asm/barrier.h
+++ b/arch/s390/include/asm/barrier.h
@@ -8,6 +8,7 @@
 #ifndef __ASM_BARRIER_H
 #define __ASM_BARRIER_H
 
+#include <asm/alternative.h>
 #include <asm/march.h>
 
 /*
@@ -16,16 +17,11 @@
  * to devices.
  */
 
-#ifdef MARCH_HAS_Z196_FEATURES
-/* Fast-BCR without checkpoint synchronization */
-#define __ASM_BCR_SERIALIZE "bcr 14,0"
-#else
-#define __ASM_BCR_SERIALIZE "bcr 15,0"
-#endif
-
 static __always_inline void bcr_serialize(void)
 {
-	asm volatile(__ASM_BCR_SERIALIZE : : : "memory");
+	asm_inline volatile(
+		ALTERNATIVE("bcr 15,0", "bcr 14,0", ALT_FACILITY(45))
+		: : : "memory");
 }
 
 #define __mb()		bcr_serialize()
diff --git a/arch/s390/include/asm/debug.h b/arch/s390/include/asm/debug.h
index c5440b3ee53d7..39d484c597748 100644
--- a/arch/s390/include/asm/debug.h
+++ b/arch/s390/include/asm/debug.h
@@ -490,6 +490,7 @@ arch_initcall(VNAME(var, reg))
 __DEFINE_STATIC_AREA(var);						\
 static debug_info_t __refdata var =					\
 	__DEBUG_INFO_INIT(var, (name), (buf_size));			\
+static debug_info_t __used __section(".s390dbf_info") *VNAME(var, info) = &var; \
 __REGISTER_STATIC_DEBUG_INFO(var, name, pages, nr_areas, view)
 
 void debug_register_static(debug_info_t *id, int pages_per_area, int nr_areas);
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 78195ee5e99f6..ecd3341686eb6 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -33,6 +33,7 @@
 #include <linux/irqflags.h>
 #include <linux/instruction_pointer.h>
 #include <linux/bitops.h>
+#include <asm/vdso/processor.h>
 #include <asm/fpu-types.h>
 #include <asm/cpu.h>
 #include <asm/page.h>
@@ -282,8 +283,6 @@ static __always_inline unsigned short stap(void)
 	return cpu_address;
 }
 
-#define cpu_relax() barrier()
-
 #define ECAG_CACHE_ATTRIBUTE	0
 #define ECAG_CPU_ATTRIBUTE	1
 
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index 0f184dbdbe5e0..d928a9ddfe402 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -20,6 +20,7 @@
 #define SCLP_ERRNOTIFY_AQ_REPAIR		1
 #define SCLP_ERRNOTIFY_AQ_INFO_LOG		2
 #define SCLP_ERRNOTIFY_AQ_OPTICS_DATA		3
+#define SCLP_ERRNOTIFY_AQ_NVME_SMART_LOG	4
 
 #ifndef __ASSEMBLER__
 #include <linux/uio.h>
diff --git a/arch/s390/include/asm/trace_clock.h b/arch/s390/include/asm/trace_clock.h
new file mode 100644
index 0000000000000..273e05cbdae02
--- /dev/null
+++ b/arch/s390/include/asm/trace_clock.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_TRACE_CLOCK_H
+#define _ASM_S390_TRACE_CLOCK_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+u64 notrace trace_clock_s390_tod(void);
+
+#define ARCH_TRACE_CLOCKS \
+	{ trace_clock_s390_tod, "s390-tod", .in_ns = 0 },
+
+#endif /* _ASM_S390_TRACE_CLOCK_H */
diff --git a/arch/s390/include/asm/vdso/processor.h b/arch/s390/include/asm/vdso/processor.h
index cfcc3e117c4c9..6775621e5a5a3 100644
--- a/arch/s390/include/asm/vdso/processor.h
+++ b/arch/s390/include/asm/vdso/processor.h
@@ -2,6 +2,8 @@
 #ifndef __ASM_VDSO_PROCESSOR_H
 #define __ASM_VDSO_PROCESSOR_H
 
-#define cpu_relax() barrier()
+#include <asm/barrier.h>
+
+#define cpu_relax()	bcr_serialize()
 
 #endif /* __ASM_VDSO_PROCESSOR_H */
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 137e4793ec117..6c88476d79a31 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_KPROBES)		+= mcount.o
 obj-$(CONFIG_RETHOOK)		+= rethook.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o
+obj-$(CONFIG_TRACING)		+= trace_clock.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
 obj-$(CONFIG_KEXEC_CORE)	+= machine_kexec.o relocate_kernel.o
 obj-$(CONFIG_VMCORE_INFO)	+= vmcore_info.o
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index 7650f2adb5cf8..dbf430f479bdf 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -26,6 +26,8 @@
 #include <linux/math.h>
 #include <linux/minmax.h>
 #include <linux/debugfs.h>
+#include <linux/glob.h>
+#include <linux/stringify.h>
 
 #include <asm/debug.h>
 
@@ -154,6 +156,7 @@ static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
 static debug_info_t *debug_area_first;
 static debug_info_t *debug_area_last;
 static DEFINE_MUTEX(debug_mutex);
+extern debug_info_t *__s390dbf_info[], *__s390dbf_info_end[];
 
 static int initialized;
 static int debug_critical;
@@ -168,7 +171,91 @@ static const struct file_operations debug_file_ops = {
 
 static struct dentry *debug_debugfs_root_entry;
 
+/* List of debug area parameters to override */
+#define PARAM_UNSET	-2
+#define PARAM_NUM	16
+static struct debug_param_t {
+	char name[DEBUG_MAX_NAME_LEN + 1];
+	int level;
+	int pages;
+} debug_param[PARAM_NUM];
+static int debug_param_num;
+
 /* functions */
+static void debug_get_param(const char *name, int *level, int *pages)
+{
+	struct debug_param_t *p;
+	int i;
+
+	for (i = 0; i < debug_param_num; i++) {
+		p = &debug_param[i];
+		if (!glob_match(p->name, name))
+			continue;
+		if (level && p->level != PARAM_UNSET) {
+			pr_info("%s: override level to %d\n", name, p->level);
+			*level = p->level;
+		}
+		if (pages && p->pages != PARAM_UNSET) {
+			pr_info("%s: override pages to %d\n", name, p->pages);
+			*pages = p->pages;
+		}
+	}
+}
+
+#define LVL_LEN		10
+#define LVL_FMT		"%" __stringify(LVL_LEN) "[^:]"
+#define NAME_FMT	"%" __stringify(DEBUG_MAX_NAME_LEN) "[^:]"
+
+static bool __init s390dbf_parse_one(const char *arg, struct debug_param_t *param)
+{
+	struct debug_param_t p = { { 0 }, PARAM_UNSET, PARAM_UNSET };
+	char level[LVL_LEN + 1] = { 0 };
+
+	/* arg: <name|pattern>:[<level>|-]:[<pages>] */
+	if (sscanf(arg, NAME_FMT ":" LVL_FMT ":%d", p.name, level, &p.pages) > 1) {
+		if (strcmp(level, "-") == 0)
+			p.level = DEBUG_OFF_LEVEL;
+		else if (kstrtoint(level, 0, &p.level) != 0)
+			return false;
+	} else if (sscanf(arg, NAME_FMT "::%d", p.name, &p.pages) != 2) {
+		return false;
+	}
+
+	if (p.level != PARAM_UNSET && p.level != DEBUG_OFF_LEVEL &&
+	    (p.level < 0 || p.level > DEBUG_MAX_LEVEL))
+		return false;
+	if (p.pages != PARAM_UNSET && p.pages < 0)
+		return false;
+	*param = p;
+
+	return true;
+}
+
+static int __init s390dbf_parse(char *arg)
+{
+	debug_info_t **id;
+	int i, rc = 0;
+
+	while (arg && debug_param_num < PARAM_NUM) {
+		if (s390dbf_parse_one(arg, &debug_param[debug_param_num]))
+			debug_param_num++;
+		else
+			rc = -EINVAL;
+		arg = strchr(arg, ',');
+		if (arg)
+			arg++;
+	}
+
+	/*
+	 * Apply level to static debug areas, delay buffer size changes until
+	 * regular memory allocations are possible.
+	 */
+	for (i = 0, id = __s390dbf_info; &id[i] < __s390dbf_info_end; i++)
+		debug_get_param(id[i]->name, &id[i]->level, NULL);
+
+	return rc;
+}
+early_param("s390dbf", s390dbf_parse);
 
 /*
  * debug_areas_alloc
@@ -305,10 +392,11 @@ static void debug_info_free(debug_info_t *db_info)
 static debug_info_t *debug_info_create(const char *name, int pages_per_area,
 				       int nr_areas, int buf_size, umode_t mode)
 {
+	int level = DEBUG_DEFAULT_LEVEL;
 	debug_info_t *rc;
 
-	rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
-			      DEBUG_DEFAULT_LEVEL, ALL_AREAS);
+	debug_get_param(name, &level, &pages_per_area);
+	rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, level, ALL_AREAS);
 	if (!rc)
 		goto out;
 
@@ -872,6 +960,7 @@ void debug_register_static(debug_info_t *id, int pages_per_area, int nr_areas)
 		return;
 	}
 
+	debug_get_param(id->name, &id->level, &pages_per_area);
 	copy = debug_info_alloc("", pages_per_area, nr_areas, id->buf_size,
 				id->level, ALL_AREAS);
 	if (!copy) {
@@ -975,16 +1064,7 @@ static int debug_set_size(debug_info_t *id, int nr_areas, int pages_per_area)
 	return 0;
 }
 
-/**
- * debug_set_level() - Sets new actual debug level if new_level is valid.
- *
- * @id:		handle for debug log
- * @new_level:	new debug level
- *
- * Return:
- *    none
- */
-void debug_set_level(debug_info_t *id, int new_level)
+static void _debug_set_level(debug_info_t *id, int new_level)
 {
 	unsigned long flags;
 
@@ -1003,6 +1083,23 @@ void debug_set_level(debug_info_t *id, int new_level)
 	id->level = new_level;
 	raw_spin_unlock_irqrestore(&id->lock, flags);
 }
+
+/**
+ * debug_set_level() - Sets new actual debug level if new_level is valid.
+ *
+ * @id:		handle for debug log
+ * @new_level:	new debug level
+ *
+ * Return:
+ *    none
+ */
+void debug_set_level(debug_info_t *id, int new_level)
+{
+	/* Level specified via kernel parameter takes precedence */
+	debug_get_param(id->name, &new_level, NULL);
+
+	_debug_set_level(id, new_level);
+}
 EXPORT_SYMBOL(debug_set_level);
 
 /*
@@ -1137,8 +1234,6 @@ static const struct ctl_table s390dbf_table[] = {
 	},
 };
 
-static struct ctl_table_header *s390dbf_sysctl_header;
-
 /**
  * debug_stop_all() - stops the debug feature if stopping is allowed.
  *
@@ -1529,7 +1624,7 @@ static int debug_input_level_fn(debug_info_t *id, struct debug_view *view,
 		goto out;
 	}
 	if (str[0] == '-') {
-		debug_set_level(id, DEBUG_OFF_LEVEL);
+		_debug_set_level(id, DEBUG_OFF_LEVEL);
 		rc = user_len;
 		goto free_str;
 	} else {
@@ -1539,7 +1634,7 @@ static int debug_input_level_fn(debug_info_t *id, struct debug_view *view,
 		pr_warn("%s is not a valid level for a debug feature\n", str);
 		rc = -EINVAL;
 	} else {
-		debug_set_level(id, new_level);
+		_debug_set_level(id, new_level);
 		rc = user_len;
 	}
 free_str:
@@ -1728,7 +1823,7 @@ EXPORT_SYMBOL(debug_sprintf_format_fn);
  */
 static int __init debug_init(void)
 {
-	s390dbf_sysctl_header = register_sysctl("s390dbf", s390dbf_table);
+	register_sysctl("s390dbf", s390dbf_table);
 	mutex_lock(&debug_mutex);
 	debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL);
 	initialized = 1;
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 0df95dcb21012..dabd569dbba8d 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -203,9 +203,6 @@ unsigned long __get_wchan(struct task_struct *p)
 	struct unwind_state state;
 	unsigned long ip = 0;
 
-	if (!task_stack_page(p))
-		return 0;
-
 	if (!try_get_task_stack(p))
 		return 0;
 
diff --git a/arch/s390/kernel/trace_clock.c b/arch/s390/kernel/trace_clock.c
new file mode 100644
index 0000000000000..9ca568058cbce
--- /dev/null
+++ b/arch/s390/kernel/trace_clock.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/trace_clock.h>
+#include <linux/timex.h>
+/*
+ * trace_clock_s390_tod(): trace clock based on the s390 TOD clock
+ *
+ * Unlike the other clocks, this is not in nanoseconds.
+ */
+u64 notrace trace_clock_s390_tod(void)
+{
+	return get_tod_clock();
+}
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index 2b62395e35bfb..1f0e71c58eb9c 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -159,6 +159,13 @@ SECTIONS
 	}
 #endif
 
+	. = ALIGN(8);
+	.s390dbf_info : {
+		__s390dbf_info = .;
+		*(.s390dbf_info)
+		__s390dbf_info_end = .;
+	}
+
 	/*
 	 * Table with the patch locations to undo expolines
 	*/
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 11a689423440f..f07168a0d3dd3 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -84,6 +84,8 @@ void __init arch_setup_zero_pages(void)
 	empty_zero_page = (unsigned long)memblock_alloc_or_panic(PAGE_SIZE << order, PAGE_SIZE);
 
 	zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
+
+	set_memory_ro(empty_zero_page, 1UL << order);
 }
 
 void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
author	Mark Brown <broonie@kernel.org>	2026-05-29 18:09:26 +0100
committer	Mark Brown <broonie@kernel.org>	2026-05-29 18:09:26 +0100
commit	6a2f8c339e219a7e4d9939f54c9bba8625c5fa58 (patch)
tree	d29b606f59ebc13fc04067affa99833d0c3cb0ab /arch
parent	25d928ed202826ffe8ee0f7944b80be922c5d081 (diff)
parent	6f2bf64ba8ad6f8ea4f2b2207952814d9f3edcc2 (diff)
download	linux-next-history-6a2f8c339e219a7e4d9939f54c9bba8625c5fa58.tar.gz