Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "87 patches.

  Subsystems affected by this patch series: mm (pagecache and hugetlb),
  procfs, misc, MAINTAINERS, lib, checkpatch, binfmt, kallsyms, ramfs,
  init, codafs, nilfs2, hfs, crash_dump, signals, seq_file, fork,
  sysvfs, kcov, gdb, resource, selftests, and ipc"

* emailed patches from Andrew Morton <[email protected]>: (87 commits)
  ipc/ipc_sysctl.c: remove fallback for !CONFIG_PROC_SYSCTL
  ipc: check checkpoint_restore_ns_capable() to modify C/R proc files
  selftests/kselftest/runner/run_one(): allow running non-executable files
  virtio-mem: disallow mapping virtio-mem memory via /dev/mem
  kernel/resource: disallow access to exclusive system RAM regions
  kernel/resource: clean up and optimize iomem_is_exclusive()
  scripts/gdb: handle split debug for vmlinux
  kcov: replace local_irq_save() with a local_lock_t
  kcov: avoid enable+disable interrupts if !in_task()
  kcov: allocate per-CPU memory on the relevant node
  Documentation/kcov: define `ip' in the example
  Documentation/kcov: include types.h in the example
  sysv: use BUILD_BUG_ON instead of runtime check
  kernel/fork.c: unshare(): use swap() to make code cleaner
  seq_file: fix passing wrong private data
  seq_file: move seq_escape() to a header
  signal: remove duplicate include in signal.h
  crash_dump: remove duplicate include in crash_dump.h
  crash_dump: fix boolreturn.cocci warning
  hfs/hfsplus: use WARN_ON for sanity check
  ...

.mailmap

@@ -73,6 +73,8 @@ Chris Chiu <[email protected]> <[email protected]>
 Chris Chiu <[email protected]> <[email protected]>
 Christophe Ricard <[email protected]>
 Christoph Hellwig <[email protected]>
+Colin Ian King <[email protected]> <[email protected]>
+Colin Ian King <[email protected]> <[email protected]>
 Corey Minyard <[email protected]>
 Damian Hobson-Garcia <[email protected]>
 Daniel Borkmann <[email protected]> <[email protected]>

Documentation/dev-tools/kcov.rst

@@ -50,6 +50,7 @@ program using kcov:
     #include <sys/mman.h>
     #include <unistd.h>
     #include <fcntl.h>
+    #include <linux/types.h>
 
     #define KCOV_INIT_TRACE			_IOR('c', 1, unsigned long)
     #define KCOV_ENABLE			_IO('c', 100)
@@ -177,6 +178,8 @@ Comparison operands collection is similar to coverage collection:
 	/* Read number of comparisons collected. */
 	n = __atomic_load_n(&cover[0], __ATOMIC_RELAXED);
 	for (i = 0; i < n; i++) {
+		uint64_t ip;
+
 		type = cover[i * KCOV_WORDS_PER_CMP + 1];
 		/* arg1 and arg2 - operands of the comparison. */
 		arg1 = cover[i * KCOV_WORDS_PER_CMP + 2];
@@ -251,6 +254,8 @@ selectively from different subsystems.
 
 .. code-block:: c
 
+    /* Same includes and defines as above. */
+
     struct kcov_remote_arg {
 	__u32		trace_mode;
 	__u32		area_size;

MAINTAINERS

@@ -767,7 +767,7 @@ F:	drivers/crypto/allwinner/
 ALLWINNER HARDWARE SPINLOCK SUPPORT
 M:	Wilken Gottwalt <[email protected]>
 S:	Maintained
-F:	Documentation/devicetree/bindings/hwlock/allwinner,sun6i-hwspinlock.yaml
+F:	Documentation/devicetree/bindings/hwlock/allwinner,sun6i-a31-hwspinlock.yaml
 F:	drivers/hwspinlock/sun6i_hwspinlock.c
 
 ALLWINNER THERMAL DRIVER
@@ -2783,7 +2783,7 @@ F:	Documentation/devicetree/bindings/arm/toshiba.yaml
 F:	Documentation/devicetree/bindings/net/toshiba,visconti-dwmac.yaml
 F:	Documentation/devicetree/bindings/gpio/toshiba,gpio-visconti.yaml
 F:	Documentation/devicetree/bindings/pci/toshiba,visconti-pcie.yaml
-F:	Documentation/devicetree/bindings/pinctrl/toshiba,tmpv7700-pinctrl.yaml
+F:	Documentation/devicetree/bindings/pinctrl/toshiba,visconti-pinctrl.yaml
 F:	Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml
 F:	arch/arm64/boot/dts/toshiba/
 F:	drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
@@ -7119,6 +7119,20 @@ F:	include/uapi/linux/mdio.h
 F:	include/uapi/linux/mii.h
 F:	net/core/of_net.c
 
+EXEC & BINFMT API
+R:	Eric Biederman <[email protected]>
+R:	Kees Cook <[email protected]>
+F:	arch/alpha/kernel/binfmt_loader.c
+F:	arch/x86/ia32/ia32_aout.c
+F:	fs/*binfmt_*.c
+F:	fs/exec.c
+F:	include/linux/binfmts.h
+F:	include/linux/elf.h
+F:	include/uapi/linux/binfmts.h
+F:	tools/testing/selftests/exec/
+N:	asm/elf.h
+N:	binfmt
+
 EXFAT FILE SYSTEM
 M:	Namjae Jeon <[email protected]>
 M:	Sungjong Seo <[email protected]>
@@ -8562,7 +8576,6 @@ M:	John Stultz <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	drivers/misc/hisi_hikey_usb.c
-F:	Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.yaml
 
 HISILICON PMU DRIVER
 M:	Shaokun Zhang <[email protected]>
@@ -9621,7 +9634,7 @@ INTEL KEEM BAY DRM DRIVER
 M:	Anitha Chrisanthus <[email protected]>
 M:	Edmund Dea <[email protected]>
 S:	Maintained
-F:	Documentation/devicetree/bindings/display/intel,kmb_display.yaml
+F:	Documentation/devicetree/bindings/display/intel,keembay-display.yaml
 F:	drivers/gpu/drm/kmb/
 
 INTEL KEEM BAY OCS AES/SM4 CRYPTO DRIVER

arch/alpha/kernel/traps.c

@@ -129,9 +129,7 @@ dik_show_trace(unsigned long *sp, const char *loglvl)
 		extern char _stext[], _etext[];
 		unsigned long tmp = *sp;
 		sp++;
-		if (tmp < (unsigned long) &_stext)
-			continue;
-		if (tmp >= (unsigned long) &_etext)
+		if (!is_kernel_text(tmp))
 			continue;
 		printk("%s[<%lx>] %pSR\n", loglvl, tmp, (void *)tmp);
 		if (i > 40) {

arch/microblaze/mm/pgtable.c

@@ -34,6 +34,7 @@
 #include <linux/mm_types.h>
 #include <linux/pgtable.h>
 #include <linux/memblock.h>
+#include <linux/kallsyms.h>
 
 #include <asm/pgalloc.h>
 #include <linux/io.h>
@@ -171,7 +172,7 @@ void __init mapin_ram(void)
 	for (s = 0; s < lowmem_size; s += PAGE_SIZE) {
 		f = _PAGE_PRESENT | _PAGE_ACCESSED |
 				_PAGE_SHARED | _PAGE_HWEXEC;
-		if ((char *) v < _stext || (char *) v >= _etext)
+		if (!is_kernel_text(v))
 			f |= _PAGE_WRENABLE;
 		else
 			/* On the MicroBlaze, no user access

arch/powerpc/mm/pgtable_32.c

@@ -33,8 +33,6 @@
 
 #include <mm/mmu_decl.h>
 
-extern char etext[], _stext[], _sinittext[], _einittext[];
-
 static u8 early_fixmap_pagetable[FIXMAP_PTE_SIZE] __page_aligned_data;
 
 notrace void __init early_ioremap_init(void)
@@ -104,14 +102,13 @@ static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
 {
 	unsigned long v, s;
 	phys_addr_t p;
-	int ktext;
+	bool ktext;
 
 	s = offset;
 	v = PAGE_OFFSET + s;
 	p = memstart_addr + s;
 	for (; s < top; s += PAGE_SIZE) {
-		ktext = ((char *)v >= _stext && (char *)v < etext) ||
-			((char *)v >= _sinittext && (char *)v < _einittext);
+		ktext = core_kernel_text(v);
 		map_kernel_page(v, p, ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL);
 		v += PAGE_SIZE;
 		p += PAGE_SIZE;

arch/riscv/lib/delay.c

@@ -4,10 +4,14 @@
  */
 
 #include <linux/delay.h>
+#include <linux/math.h>
 #include <linux/param.h>
 #include <linux/timex.h>
+#include <linux/types.h>
 #include <linux/export.h>
 
+#include <asm/processor.h>
+
 /*
  * This is copies from arch/arm/include/asm/delay.h
  *

arch/s390/include/asm/facility.h

@@ -9,8 +9,12 @@
 #define __ASM_FACILITY_H
 
 #include <asm/facility-defs.h>
+
+#include <linux/minmax.h>
 #include <linux/string.h>
+#include <linux/types.h>
 #include <linux/preempt.h>
+
 #include <asm/lowcore.h>
 
 #define MAX_FACILITY_BIT (sizeof(stfle_fac_list) * 8)

arch/x86/kernel/aperture_64.c

@@ -73,12 +73,23 @@ static int gart_mem_pfn_is_ram(unsigned long pfn)
 		      (pfn >= aperture_pfn_start + aperture_page_count));
 }
 
+#ifdef CONFIG_PROC_VMCORE
+static bool gart_oldmem_pfn_is_ram(struct vmcore_cb *cb, unsigned long pfn)
+{
+	return !!gart_mem_pfn_is_ram(pfn);
+}
+
+static struct vmcore_cb gart_vmcore_cb = {
+	.pfn_is_ram = gart_oldmem_pfn_is_ram,
+};
+#endif
+
 static void __init exclude_from_core(u64 aper_base, u32 aper_order)
 {
 	aperture_pfn_start = aper_base >> PAGE_SHIFT;
 	aperture_page_count = (32 * 1024 * 1024) << aper_order >> PAGE_SHIFT;
 #ifdef CONFIG_PROC_VMCORE
-	WARN_ON(register_oldmem_pfn_is_ram(&gart_mem_pfn_is_ram));
+	register_vmcore_cb(&gart_vmcore_cb);
 #endif
 #ifdef CONFIG_PROC_KCORE
 	WARN_ON(register_mem_pfn_is_ram(&gart_mem_pfn_is_ram));

arch/x86/kernel/unwind_orc.c

@@ -175,7 +175,7 @@ static struct orc_entry *orc_find(unsigned long ip)
 	}
 
 	/* vmlinux .init slow lookup: */
-	if (init_kernel_text(ip))
+	if (is_kernel_inittext(ip))
 		return __orc_find(__start_orc_unwind_ip, __start_orc_unwind,
 				  __stop_orc_unwind_ip - __start_orc_unwind_ip, ip);
 

arch/x86/mm/init_32.c

@@ -238,11 +238,7 @@ page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
 	}
 }
 
-/*
- * The <linux/kallsyms.h> already defines is_kernel_text,
- * using '__' prefix not to get in conflict.
- */
-static inline int __is_kernel_text(unsigned long addr)
+static inline int is_x86_32_kernel_text(unsigned long addr)
 {
 	if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
 		return 1;
@@ -333,8 +329,8 @@ kernel_physical_mapping_init(unsigned long start,
 				addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
 					PAGE_OFFSET + PAGE_SIZE-1;
 
-				if (__is_kernel_text(addr) ||
-				    __is_kernel_text(addr2))
+				if (is_x86_32_kernel_text(addr) ||
+				    is_x86_32_kernel_text(addr2))
 					prot = PAGE_KERNEL_LARGE_EXEC;
 
 				pages_2m++;
@@ -359,7 +355,7 @@ kernel_physical_mapping_init(unsigned long start,
 				 */
 				pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
 
-				if (__is_kernel_text(addr))
+				if (is_x86_32_kernel_text(addr))
 					prot = PAGE_KERNEL_EXEC;
 
 				pages_4k++;
@@ -789,7 +785,7 @@ static void mark_nxdata_nx(void)
 	 */
 	unsigned long start = PFN_ALIGN(_etext);
 	/*
-	 * This comes from __is_kernel_text upper limit. Also HPAGE where used:
+	 * This comes from is_x86_32_kernel_text upper limit. Also HPAGE where used:
 	 */
 	unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;
 

arch/x86/xen/mmu_hvm.c

@@ -9,39 +9,28 @@
 
 #ifdef CONFIG_PROC_VMCORE
 /*
- * This function is used in two contexts:
- * - the kdump kernel has to check whether a pfn of the crashed kernel
- *   was a ballooned page. vmcore is using this function to decide
- *   whether to access a pfn of the crashed kernel.
- * - the kexec kernel has to check whether a pfn was ballooned by the
- *   previous kernel. If the pfn is ballooned, handle it properly.
- * Returns 0 if the pfn is not backed by a RAM page, the caller may
+ * The kdump kernel has to check whether a pfn of the crashed kernel
+ * was a ballooned page. vmcore is using this function to decide
+ * whether to access a pfn of the crashed kernel.
+ * Returns "false" if the pfn is not backed by a RAM page, the caller may
  * handle the pfn special in this case.
  */
-static int xen_oldmem_pfn_is_ram(unsigned long pfn)
+static bool xen_vmcore_pfn_is_ram(struct vmcore_cb *cb, unsigned long pfn)
 {
 	struct xen_hvm_get_mem_type a = {
 		.domid = DOMID_SELF,
 		.pfn = pfn,
 	};
-	int ram;
 
-	if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
-		return -ENXIO;
-
-	switch (a.mem_type) {
-	case HVMMEM_mmio_dm:
-		ram = 0;
-		break;
-	case HVMMEM_ram_rw:
-	case HVMMEM_ram_ro:
-	default:
-		ram = 1;
-		break;
+	if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a)) {
+		pr_warn_once("Unexpected HVMOP_get_mem_type failure\n");
+		return true;
 	}
-
-	return ram;
+	return a.mem_type != HVMMEM_mmio_dm;
 }
+static struct vmcore_cb xen_vmcore_cb = {
+	.pfn_is_ram = xen_vmcore_pfn_is_ram,
+};
 #endif
 
 static void xen_hvm_exit_mmap(struct mm_struct *mm)
@@ -75,6 +64,6 @@ void __init xen_hvm_init_mmu_ops(void)
 	if (is_pagetable_dying_supported())
 		pv_ops.mmu.exit_mmap = xen_hvm_exit_mmap;
 #ifdef CONFIG_PROC_VMCORE
-	WARN_ON(register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram));
+	register_vmcore_cb(&xen_vmcore_cb);
 #endif
 }

drivers/gpu/drm/drm_dp_mst_topology.c

@@ -1668,13 +1668,10 @@ __dump_topology_ref_history(struct drm_dp_mst_topology_ref_history *history,
 	for (i = 0; i < history->len; i++) {
 		const struct drm_dp_mst_topology_ref_entry *entry =
 			&history->entries[i];
-		ulong *entries;
-		uint nr_entries;
 		u64 ts_nsec = entry->ts_nsec;
 		u32 rem_nsec = do_div(ts_nsec, 1000000000);
 
-		nr_entries = stack_depot_fetch(entry->backtrace, &entries);
-		stack_trace_snprint(buf, PAGE_SIZE, entries, nr_entries, 4);
+		stack_depot_snprint(entry->backtrace, buf, PAGE_SIZE, 4);
 
 		drm_printf(&p, "  %d %ss (last at %5llu.%06u):\n%s",
 			   entry->count,

drivers/gpu/drm/drm_mm.c

@@ -118,8 +118,6 @@ static noinline void save_stack(struct drm_mm_node *node)
 static void show_leaks(struct drm_mm *mm)
 {
 	struct drm_mm_node *node;
-	unsigned long *entries;
-	unsigned int nr_entries;
 	char *buf;
 
 	buf = kmalloc(BUFSZ, GFP_KERNEL);
@@ -133,8 +131,7 @@ static void show_leaks(struct drm_mm *mm)
 			continue;
 		}
 
-		nr_entries = stack_depot_fetch(node->stack, &entries);
-		stack_trace_snprint(buf, BUFSZ, entries, nr_entries, 0);
+		stack_depot_snprint(node->stack, buf, BUFSZ, 0);
 		DRM_ERROR("node [%08llx + %08llx]: inserted at\n%s",
 			  node->start, node->size, buf);
 	}

drivers/gpu/drm/i915/i915_vma.c

@@ -56,8 +56,6 @@ void i915_vma_free(struct i915_vma *vma)
 
 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
 {
-	unsigned long *entries;
-	unsigned int nr_entries;
 	char buf[512];
 
 	if (!vma->node.stack) {
@@ -66,8 +64,7 @@ static void vma_print_allocator(struct i915_vma *vma, const char *reason)
 		return;
 	}
 
-	nr_entries = stack_depot_fetch(vma->node.stack, &entries);
-	stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
+	stack_depot_snprint(vma->node.stack, buf, sizeof(buf), 0);
 	DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
 			 vma->node.start, vma->node.size, reason, buf);
 }