Merge tag 'mm-nonmm-stable-2023-08-28-22-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - An extensive rework of kexec and crash Kconfig from Eric DeVolder
   ("refactor Kconfig to consolidate KEXEC and CRASH options")

 - kernel.h slimming work from Andy Shevchenko ("kernel.h: Split out a
   couple of macros to args.h")

 - gdb feature work from Kuan-Ying Lee ("Add GDB memory helper
   commands")

 - vsprintf inclusion rationalization from Andy Shevchenko
   ("lib/vsprintf: Rework header inclusions")

 - Switch the handling of kdump from a udev scheme to in-kernel
   handling, by Eric DeVolder ("crash: Kernel handling of CPU and memory
   hot un/plug")

 - Many singleton patches to various parts of the tree

* tag 'mm-nonmm-stable-2023-08-28-22-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (81 commits)
  document while_each_thread(), change first_tid() to use for_each_thread()
  drivers/char/mem.c: shrink character device's devlist[] array
  x86/crash: optimize CPU changes
  crash: change crash_prepare_elf64_headers() to for_each_possible_cpu()
  crash: hotplug support for kexec_load()
  x86/crash: add x86 crash hotplug support
  crash: memory and CPU hotplug sysfs attributes
  kexec: exclude elfcorehdr from the segment digest
  crash: add generic infrastructure for crash hotplug support
  crash: move a few code bits to setup support of crash hotplug
  kstrtox: consistently use _tolower()
  kill do_each_thread()
  nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse
  scripts/bloat-o-meter: count weak symbol sizes
  treewide: drop CONFIG_EMBEDDED
  lockdep: fix static memory detection even more
  lib/vsprintf: declare no_hash_pointers in sprintf.h
  lib/vsprintf: split out sprintf() and friends
  kernel/fork: stop playing lockless games for exe_file replacement
  adfs: delete unused "union adfs_dirtail" definition
  ...

11 files changed, 49 insertions, 38 deletions

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index fe6690ecf563..43dab03958f1 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -282,6 +282,16 @@ static ssize_t print_cpus_nohz_full(struct device *dev,
 static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL);
 #endif
 
+#ifdef CONFIG_CRASH_HOTPLUG
+static ssize_t crash_hotplug_show(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	return sysfs_emit(buf, "%d\n", crash_hotplug_cpu_support());
+}
+static DEVICE_ATTR_ADMIN_RO(crash_hotplug);
+#endif
+
 static void cpu_device_release(struct device *dev)
 {
 	/*
@@ -469,6 +479,9 @@ static struct attribute *cpu_root_attrs[] = {
 #ifdef CONFIG_NO_HZ_FULL
 	&dev_attr_nohz_full.attr,
 #endif
+#ifdef CONFIG_CRASH_HOTPLUG
+	&dev_attr_crash_hotplug.attr,
+#endif
 #ifdef CONFIG_GENERIC_CPU_AUTOPROBE
 	&dev_attr_modalias.attr,
 #endif
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 8191709c9ad2..f3b9a4d0fa3b 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -497,6 +497,16 @@ static ssize_t auto_online_blocks_store(struct device *dev,
 
 static DEVICE_ATTR_RW(auto_online_blocks);
 
+#ifdef CONFIG_CRASH_HOTPLUG
+#include <linux/kexec.h>
+static ssize_t crash_hotplug_show(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", crash_hotplug_memory_support());
+}
+static DEVICE_ATTR_RO(crash_hotplug);
+#endif
+
 /*
  * Some architectures will have custom drivers to do this, and
  * will not need to do it from userspace.  The fake hot-add code
@@ -896,6 +906,9 @@ static struct attribute *memory_root_attrs[] = {
 
 	&dev_attr_block_size_bytes.attr,
 	&dev_attr_auto_online_blocks.attr,
+#ifdef CONFIG_CRASH_HOTPLUG
+	&dev_attr_crash_hotplug.attr,
+#endif
 	NULL
 };
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 0fcc8615fb4f..1052b0f2d4cf 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -692,23 +692,23 @@ static const struct file_operations full_fops = {
 
 static const struct memdev {
 	const char *name;
-	umode_t mode;
 	const struct file_operations *fops;
 	fmode_t fmode;
+	umode_t mode;
 } devlist[] = {
 #ifdef CONFIG_DEVMEM
-	 [DEVMEM_MINOR] = { "mem", 0, &mem_fops, FMODE_UNSIGNED_OFFSET },
+	[DEVMEM_MINOR] = { "mem", &mem_fops, FMODE_UNSIGNED_OFFSET, 0 },
 #endif
-	 [3] = { "null", 0666, &null_fops, FMODE_NOWAIT },
+	[3] = { "null", &null_fops, FMODE_NOWAIT, 0666 },
 #ifdef CONFIG_DEVPORT
-	 [4] = { "port", 0, &port_fops, 0 },
+	[4] = { "port", &port_fops, 0, 0 },
 #endif
-	 [5] = { "zero", 0666, &zero_fops, FMODE_NOWAIT },
-	 [7] = { "full", 0666, &full_fops, 0 },
-	 [8] = { "random", 0666, &random_fops, FMODE_NOWAIT },
-	 [9] = { "urandom", 0666, &urandom_fops, FMODE_NOWAIT },
+	[5] = { "zero", &zero_fops, FMODE_NOWAIT, 0666 },
+	[7] = { "full", &full_fops, 0, 0666 },
+	[8] = { "random", &random_fops, FMODE_NOWAIT, 0666 },
+	[9] = { "urandom", &urandom_fops, FMODE_NOWAIT, 0666 },
 #ifdef CONFIG_PRINTK
-	[11] = { "kmsg", 0644, &kmsg_fops, 0 },
+	[11] = { "kmsg", &kmsg_fops, 0, 0644 },
 #endif
 };
 
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 6b2d8a1e2aa9..290e856fe9e9 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -21,6 +21,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <linux/math.h>
 #include <linux/string_helpers.h>
 
 #include "i915_reg.h"
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
index ba62eb5d7c51..04e6810954b2 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
@@ -29,13 +29,6 @@
 
 #include "intel_wakeref.h"
 
-/*FIXME: Move this to a more appropriate place. */
-#define abs_diff(a, b) ({			\
-	typeof(a) __a = (a);			\
-	typeof(b) __b = (b);			\
-	(void) (&__a == &__b);			\
-	__a > __b ? (__a - __b) : (__b - __a); })
-
 enum tc_port;
 struct drm_i915_private;
 struct intel_atomic_state;
diff --git a/drivers/gpu/ipu-v3/ipu-image-convert.c b/drivers/gpu/ipu-v3/ipu-image-convert.c
index af1612044eef..841316582ea9 100644
--- a/drivers/gpu/ipu-v3/ipu-image-convert.c
+++ b/drivers/gpu/ipu-v3/ipu-image-convert.c
@@ -7,7 +7,10 @@
 
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
+#include <linux/math.h>
+
 #include <video/imx-ipu-image-convert.h>
+
 #include "ipu-prv.h"
 
 /*
@@ -543,7 +546,7 @@ static void find_best_seam(struct ipu_image_convert_ctx *ctx,
 		unsigned int in_pos;
 		unsigned int in_pos_aligned;
 		unsigned int in_pos_rounded;
-		unsigned int abs_diff;
+		unsigned int diff;
 
 		/*
 		 * Tiles in the right row / bottom column may not be allowed to
@@ -575,15 +578,11 @@ static void find_best_seam(struct ipu_image_convert_ctx *ctx,
 		    (in_edge - in_pos_rounded) % in_burst)
 			continue;
 
-		if (in_pos < in_pos_aligned)
-			abs_diff = in_pos_aligned - in_pos;
-		else
-			abs_diff = in_pos - in_pos_aligned;
-
-		if (abs_diff < min_diff) {
+		diff = abs_diff(in_pos, in_pos_aligned);
+		if (diff < min_diff) {
 			in_seam = in_pos_rounded;
 			out_seam = out_pos;
-			min_diff = abs_diff;
+			min_diff = diff;
 		}
 	}
 
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 09e422da482f..4b9036c6d45b 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -89,6 +89,7 @@ config ALPINE_MSI
 config AL_FIC
 	bool "Amazon's Annapurna Labs Fabric Interrupt Controller"
 	depends on OF
+	depends on HAS_IOMEM
 	select GENERIC_IRQ_CHIP
 	select IRQ_DOMAIN
 	help
diff --git a/drivers/net/ethernet/altera/Kconfig b/drivers/net/ethernet/altera/Kconfig
index 17985319088c..4ef819a9a1ad 100644
--- a/drivers/net/ethernet/altera/Kconfig
+++ b/drivers/net/ethernet/altera/Kconfig
@@ -2,6 +2,7 @@
 config ALTERA_TSE
 	tristate "Altera Triple-Speed Ethernet MAC support"
 	depends on HAS_DMA
+	depends on HAS_IOMEM
 	select PHYLIB
 	select PHYLINK
 	select PCS_LYNX
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 82d35dbbfa6c..9be63a1f1f0c 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -222,16 +222,11 @@ static inline int calculate_baud_abs_diff(struct uart_port *port,
 				unsigned int baud, unsigned int mode)
 {
 	unsigned int n = port->uartclk / (mode * baud);
-	int abs_diff;
 
 	if (n == 0)
 		n = 1;
 
-	abs_diff = baud - (port->uartclk / (mode * n));
-	if (abs_diff < 0)
-		abs_diff = -abs_diff;
-
-	return abs_diff;
+	return abs_diff(baud, port->uartclk / (mode * n));
 }
 
 /*
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 63db04b9113a..27d8e3a1aace 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3031,7 +3031,7 @@ void __do_SAK(struct tty_struct *tty)
 	} while_each_pid_task(session, PIDTYPE_SID, p);
 
 	/* Now kill any processes that happen to have the tty open */
-	do_each_thread(g, p) {
+	for_each_process_thread(g, p) {
 		if (p->signal->tty == tty) {
 			tty_notice(tty, "SAK: killed process %d (%s): by controlling tty\n",
 				   task_pid_nr(p), p->comm);
@@ -3048,7 +3048,7 @@ void __do_SAK(struct tty_struct *tty)
 					PIDTYPE_SID);
 		}
 		task_unlock(p);
-	} while_each_thread(g, p);
+	}
 	read_unlock(&tasklist_lock);
 	put_pid(session);
 }
diff --git a/drivers/video/fbdev/core/svgalib.c b/drivers/video/fbdev/core/svgalib.c
index 9e01322fabe3..2cba158888ea 100644
--- a/drivers/video/fbdev/core/svgalib.c
+++ b/drivers/video/fbdev/core/svgalib.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/fb.h>
+#include <linux/math.h>
 #include <linux/svga.h>
 #include <asm/types.h>
 #include <asm/io.h>
@@ -372,12 +373,6 @@ EXPORT_SYMBOL(svga_get_caps);
  *  F_VCO = (F_BASE * M) / N
  *  F_OUT = F_VCO / (2^R)
  */
-
-static inline u32 abs_diff(u32 a, u32 b)
-{
-	return (a > b) ? (a - b) : (b - a);
-}
-
 int svga_compute_pll(const struct svga_pll *pll, u32 f_wanted, u16 *m, u16 *n, u16 *r, int node)
 {
 	u16 am, an, ar;