Merge tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:
 "As usual, lots of singleton and doubleton patches all over the tree
  and there's little I can say which isn't in the individual changelogs.

  The lengthier patch series are

   - 'kdump: use generic functions to simplify crashkernel reservation
     in arch', from Baoquan He. This is mainly cleanups and
     consolidation of the 'crashkernel=' kernel parameter handling

   - After much discussion, David Laight's 'minmax: Relax type checks in
     min() and max()' is here. Hopefully reduces some typecasting and
     the use of min_t() and max_t()

   - A group of patches from Oleg Nesterov which clean up and slightly
     fix our handling of reads from /proc/PID/task/... and which remove
     task_struct.thread_group"

* tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (64 commits)
  scripts/gdb/vmalloc: disable on no-MMU
  scripts/gdb: fix usage of MOD_TEXT not defined when CONFIG_MODULES=n
  .mailmap: add address mapping for Tomeu Vizoso
  mailmap: update email address for Claudiu Beznea
  tools/testing/selftests/mm/run_vmtests.sh: lower the ptrace permissions
  .mailmap: map Benjamin Poirier's address
  scripts/gdb: add lx_current support for riscv
  ocfs2: fix a spelling typo in comment
  proc: test ProtectionKey in proc-empty-vm test
  proc: fix proc-empty-vm test with vsyscall
  fs/proc/base.c: remove unneeded semicolon
  do_io_accounting: use sig->stats_lock
  do_io_accounting: use __for_each_thread()
  ocfs2: replace BUG_ON() at ocfs2_num_free_extents() with ocfs2_error()
  ocfs2: fix a typo in a comment
  scripts/show_delta: add __main__ judgement before main code
  treewide: mark stuff as __ro_after_init
  fs: ocfs2: check status values
  proc: test /proc/${pid}/statm
  compiler.h: move __is_constexpr() to compiler.h
  ...

106 files changed, 894 insertions, 1000 deletions

diff --git a/.mailmap b/.mailmap
index 2643b7203a74..43031441b2d9 100644
--- a/.mailmap
+++ b/.mailmap
@@ -95,6 +95,7 @@ Ben M Cahill <ben.m.cahill@intel.com>
 Ben Widawsky <bwidawsk@kernel.org> <ben@bwidawsk.net>
 Ben Widawsky <bwidawsk@kernel.org> <ben.widawsky@intel.com>
 Ben Widawsky <bwidawsk@kernel.org> <benjamin.widawsky@intel.com>
+Benjamin Poirier <benjamin.poirier@gmail.com> <bpoirier@suse.de>
 Bjorn Andersson <andersson@kernel.org> <bjorn@kryo.se>
 Bjorn Andersson <andersson@kernel.org> <bjorn.andersson@linaro.org>
 Bjorn Andersson <andersson@kernel.org> <bjorn.andersson@sonymobile.com>
@@ -128,6 +129,7 @@ Christian Brauner <brauner@kernel.org> <christian.brauner@ubuntu.com>
 Christian Marangi <ansuelsmth@gmail.com>
 Christophe Ricard <christophe.ricard@gmail.com>
 Christoph Hellwig <hch@lst.de>
+Claudiu Beznea <claudiu.beznea@tuxon.dev> <claudiu.beznea@microchip.com>
 Colin Ian King <colin.i.king@gmail.com> <colin.king@canonical.com>
 Corey Minyard <minyard@acm.org>
 Damian Hobson-Garcia <dhobsong@igel.co.jp>
@@ -568,6 +570,7 @@ Takashi YOSHII <takashi.yoshii.zj@renesas.com>
 Tamizh Chelvam Raja <quic_tamizhr@quicinc.com> <tamizhr@codeaurora.org>
 Taniya Das <quic_tdas@quicinc.com> <tdas@codeaurora.org>
 Tejun Heo <htejun@gmail.com>
+Tomeu Vizoso <tomeu@tomeuvizoso.net> <tomeu.vizoso@collabora.com>
 Thomas Graf <tgraf@suug.ch>
 Thomas Körper <socketcan@esd.eu> <thomas.koerper@esd.eu>
 Thomas Pedersen <twp@codeaurora.org>
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 15eca804239e..b01cac05bd4c 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1010,7 +1010,8 @@ static void __init reserve_crashkernel(void)
 
 	total_mem = get_total_mem();
 	ret = parse_crashkernel(boot_command_line, total_mem,
-				&crash_size, &crash_base);
+				&crash_size, &crash_base,
+				NULL, NULL);
 	/* invalid value specified or crashkernel=0 */
 	if (ret || !crash_size)
 		return;
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6062a52a084f..7b071a00425d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1498,6 +1498,9 @@ config ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG
 config ARCH_SUPPORTS_CRASH_DUMP
 	def_bool y
 
+config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+	def_bool CRASH_CORE
+
 config TRANS_TABLE
 	def_bool y
 	depends on HIBERNATION || KEXEC_CORE
diff --git a/arch/arm64/include/asm/crash_core.h b/arch/arm64/include/asm/crash_core.h
new file mode 100644
index 000000000000..9f5c8d339f44
--- /dev/null
+++ b/arch/arm64/include/asm/crash_core.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ARM64_CRASH_CORE_H
+#define _ARM64_CRASH_CORE_H
+
+/* Current arm64 boot protocol requires 2MB alignment */
+#define CRASH_ALIGN                     SZ_2M
+
+#define CRASH_ADDR_LOW_MAX              arm64_dma_phys_limit
+#define CRASH_ADDR_HIGH_MAX             (PHYS_MASK + 1)
+#endif
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 8deec68028ac..74c1db8ce271 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -65,15 +65,6 @@ EXPORT_SYMBOL(memstart_addr);
  */
 phys_addr_t __ro_after_init arm64_dma_phys_limit;
 
-/* Current arm64 boot protocol requires 2MB alignment */
-#define CRASH_ALIGN			SZ_2M
-
-#define CRASH_ADDR_LOW_MAX		arm64_dma_phys_limit
-#define CRASH_ADDR_HIGH_MAX		(PHYS_MASK + 1)
-#define CRASH_HIGH_SEARCH_BASE		SZ_4G
-
-#define DEFAULT_CRASH_KERNEL_LOW_SIZE	(128UL << 20)
-
 /*
  * To make optimal use of block mappings when laying out the linear
  * mapping, round down the base of physical memory to a size that can
@@ -101,140 +92,25 @@ phys_addr_t __ro_after_init arm64_dma_phys_limit;
 #define ARM64_MEMSTART_ALIGN	(1UL << ARM64_MEMSTART_SHIFT)
 #endif
 
-static int __init reserve_crashkernel_low(unsigned long long low_size)
-{
-	unsigned long long low_base;
-
-	low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
-	if (!low_base) {
-		pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
-		return -ENOMEM;
-	}
-
-	pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",
-		low_base, low_base + low_size, low_size >> 20);
-
-	crashk_low_res.start = low_base;
-	crashk_low_res.end   = low_base + low_size - 1;
-	insert_resource(&iomem_resource, &crashk_low_res);
-
-	return 0;
-}
-
-/*
- * reserve_crashkernel() - reserves memory for crash kernel
- *
- * This function reserves memory area given in "crashkernel=" kernel command
- * line parameter. The memory reserved is used by dump capture kernel when
- * primary kernel is crashing.
- */
-static void __init reserve_crashkernel(void)
+static void __init arch_reserve_crashkernel(void)
 {
-	unsigned long long crash_low_size = 0, search_base = 0;
-	unsigned long long crash_max = CRASH_ADDR_LOW_MAX;
+	unsigned long long low_size = 0;
 	unsigned long long crash_base, crash_size;
 	char *cmdline = boot_command_line;
-	bool fixed_base = false;
 	bool high = false;
 	int ret;
 
 	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
 		return;
 
-	/* crashkernel=X[@offset] */
 	ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
-				&crash_size, &crash_base);
-	if (ret == -ENOENT) {
-		ret = parse_crashkernel_high(cmdline, 0, &crash_size, &crash_base);
-		if (ret || !crash_size)
-			return;
-
-		/*
-		 * crashkernel=Y,low can be specified or not, but invalid value
-		 * is not allowed.
-		 */
-		ret = parse_crashkernel_low(cmdline, 0, &crash_low_size, &crash_base);
-		if (ret == -ENOENT)
-			crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
-		else if (ret)
-			return;
-
-		search_base = CRASH_HIGH_SEARCH_BASE;
-		crash_max = CRASH_ADDR_HIGH_MAX;
-		high = true;
-	} else if (ret || !crash_size) {
-		/* The specified value is invalid */
+				&crash_size, &crash_base,
+				&low_size, &high);
+	if (ret)
 		return;
-	}
-
-	crash_size = PAGE_ALIGN(crash_size);
-
-	/* User specifies base address explicitly. */
-	if (crash_base) {
-		fixed_base = true;
-		search_base = crash_base;
-		crash_max = crash_base + crash_size;
-	}
-
-retry:
-	crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
-					       search_base, crash_max);
-	if (!crash_base) {
-		/*
-		 * For crashkernel=size[KMG]@offset[KMG], print out failure
-		 * message if can't reserve the specified region.
-		 */
-		if (fixed_base) {
-			pr_warn("crashkernel reservation failed - memory is in use.\n");
-			return;
-		}
-
-		/*
-		 * For crashkernel=size[KMG], if the first attempt was for
-		 * low memory, fall back to high memory, the minimum required
-		 * low memory will be reserved later.
-		 */
-		if (!high && crash_max == CRASH_ADDR_LOW_MAX) {
-			crash_max = CRASH_ADDR_HIGH_MAX;
-			search_base = CRASH_ADDR_LOW_MAX;
-			crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
-			goto retry;
-		}
-
-		/*
-		 * For crashkernel=size[KMG],high, if the first attempt was
-		 * for high memory, fall back to low memory.
-		 */
-		if (high && crash_max == CRASH_ADDR_HIGH_MAX) {
-			crash_max = CRASH_ADDR_LOW_MAX;
-			search_base = 0;
-			goto retry;
-		}
-		pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
-			crash_size);
-		return;
-	}
-
-	if ((crash_base >= CRASH_ADDR_LOW_MAX) && crash_low_size &&
-	     reserve_crashkernel_low(crash_low_size)) {
-		memblock_phys_free(crash_base, crash_size);
-		return;
-	}
-
-	pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
-		crash_base, crash_base + crash_size, crash_size >> 20);
-
-	/*
-	 * The crashkernel memory will be removed from the kernel linear
-	 * map. Inform kmemleak so that it won't try to access it.
-	 */
-	kmemleak_ignore_phys(crash_base);