Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "VM:
   - z3fold fixes and enhancements by Henry Burns and Vitaly Wool

   - more accurate reclaimed slab caches calculations by Yafang Shao

   - fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by
     Christoph Hellwig

   - !CONFIG_MMU fixes by Christoph Hellwig

   - new novmcoredd parameter to omit device dumps from vmcore, by
     Kairui Song

   - new test_meminit module for testing heap and pagealloc
     initialization, by Alexander Potapenko

   - ioremap improvements for huge mappings, by Anshuman Khandual

   - generalize kprobe page fault handling, by Anshuman Khandual

   - device-dax hotplug fixes and improvements, by Pavel Tatashin

   - enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V

   - add pte_devmap() support for arm64, by Robin Murphy

   - unify locked_vm accounting with a helper, by Daniel Jordan

   - several misc fixes

  core/lib:
   - new typeof_member() macro including some users, by Alexey Dobriyan

   - make BIT() and GENMASK() available in asm, by Masahiro Yamada

   - changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better
     code generation, by Alexey Dobriyan

   - rbtree code size optimizations, by Michel Lespinasse

   - convert struct pid count to refcount_t, by Joel Fernandes

  get_maintainer.pl:
   - add --no-moderated switch to skip moderated ML's, by Joe Perches

  misc:
   - ptrace PTRACE_GET_SYSCALL_INFO interface

   - coda updates

   - gdb scripts, various"

[ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ]

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits)
  fs/select.c: use struct_size() in kmalloc()
  mm: add account_locked_vm utility function
  arm64: mm: implement pte_devmap support
  mm: introduce ARCH_HAS_PTE_DEVMAP
  mm: clean up is_device_*_page() definitions
  mm/mmap: move common defines to mman-common.h
  mm: move MAP_SYNC to asm-generic/mman-common.h
  device-dax: "Hotremove" persistent memory that is used like normal RAM
  mm/hotplug: make remove_memory() interface usable
  device-dax: fix memory and resource leak if hotplug fails
  include/linux/lz4.h: fix spelling and copy-paste errors in documentation
  ipc/mqueue.c: only perform resource calculation if user valid
  include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures
  scripts/gdb: add helpers to find and list devices
  scripts/gdb: add lx-genpd-summary command
  drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl
  kernel/pid.c: convert struct pid count to refcount_t
  drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings
  select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining()
  select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR
  ...

6 files changed, 70 insertions, 64 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 86f81b5afd95..e1ea69994e0f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -24,6 +24,7 @@ config ARM64
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_KEEPINITRD
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
+	select ARCH_HAS_PTE_DEVMAP
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_SETUP_DMA_OPS
 	select ARCH_HAS_SET_DIRECT_MAP
diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
index f318258a14be..92d2e9f28f28 100644
--- a/arch/arm64/include/asm/pgtable-prot.h
+++ b/arch/arm64/include/asm/pgtable-prot.h
@@ -16,6 +16,7 @@
 #define PTE_WRITE		(PTE_DBM)		 /* same as DBM (51) */
 #define PTE_DIRTY		(_AT(pteval_t, 1) << 55)
 #define PTE_SPECIAL		(_AT(pteval_t, 1) << 56)
+#define PTE_DEVMAP		(_AT(pteval_t, 1) << 57)
 #define PTE_PROT_NONE		(_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
 
 #ifndef __ASSEMBLY__
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 3052381baaeb..87a4b2ddc1a1 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -79,6 +79,7 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define pte_write(pte)		(!!(pte_val(pte) & PTE_WRITE))
 #define pte_user_exec(pte)	(!(pte_val(pte) & PTE_UXN))
 #define pte_cont(pte)		(!!(pte_val(pte) & PTE_CONT))
+#define pte_devmap(pte)		(!!(pte_val(pte) & PTE_DEVMAP))
 
 #define pte_cont_addr_end(addr, end)						\
 ({	unsigned long __boundary = ((addr) + CONT_PTE_SIZE) & CONT_PTE_MASK;	\
@@ -206,6 +207,11 @@ static inline pmd_t pmd_mkcont(pmd_t pmd)
 	return __pmd(pmd_val(pmd) | PMD_SECT_CONT);
 }
 
+static inline pte_t pte_mkdevmap(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(PTE_DEVMAP));
+}
+
 static inline void set_pte(pte_t *ptep, pte_t pte)
 {
 	WRITE_ONCE(*ptep, pte);
@@ -388,6 +394,11 @@ static inline int pmd_protnone(pmd_t pmd)
 
 #define pmd_mkhuge(pmd)		(__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmd_devmap(pmd)		pte_devmap(pmd_pte(pmd))
+#endif
+#define pmd_mkdevmap(pmd)	pte_pmd(pte_mkdevmap(pmd_pte(pmd)))
+
 #define __pmd_to_phys(pmd)	__pte_to_phys(pmd_pte(pmd))
 #define __phys_to_pmd_val(phys)	__phys_to_pte_val(phys)
 #define pmd_pfn(pmd)		((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT)
@@ -673,6 +684,16 @@ static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
 {
 	return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty);
 }
+
+static inline int pud_devmap(pud_t pud)
+{
+	return 0;
+}
+
+static inline int pgd_devmap(pgd_t pgd)
+{
+	return 0;
+}
 #endif
 
 /*
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index a7522fca1105..06ebcfef73df 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -9,7 +9,7 @@
 #ifndef __ASM_SYSREG_H
 #define __ASM_SYSREG_H
 
-#include <linux/const.h>
+#include <linux/bits.h>
 #include <linux/stringify.h>
 
 /*
@@ -478,31 +478,31 @@
 #define SYS_CNTV_CVAL_EL02		sys_reg(3, 5, 14, 3, 2)
 
 /* Common SCTLR_ELx flags. */
-#define SCTLR_ELx_DSSBS	(_BITUL(44))
-#define SCTLR_ELx_ENIA	(_BITUL(31))
-#define SCTLR_ELx_ENIB	(_BITUL(30))
-#define SCTLR_ELx_ENDA	(_BITUL(27))
-#define SCTLR_ELx_EE    (_BITUL(25))
-#define SCTLR_ELx_IESB	(_BITUL(21))
-#define SCTLR_ELx_WXN	(_BITUL(19))
-#define SCTLR_ELx_ENDB	(_BITUL(13))
-#define SCTLR_ELx_I	(_BITUL(12))
-#define SCTLR_ELx_SA	(_BITUL(3))
-#define SCTLR_ELx_C	(_BITUL(2))
-#define SCTLR_ELx_A	(_BITUL(1))
-#define SCTLR_ELx_M	(_BITUL(0))
+#define SCTLR_ELx_DSSBS	(BIT(44))
+#define SCTLR_ELx_ENIA	(BIT(31))
+#define SCTLR_ELx_ENIB	(BIT(30))
+#define SCTLR_ELx_ENDA	(BIT(27))
+#define SCTLR_ELx_EE    (BIT(25))
+#define SCTLR_ELx_IESB	(BIT(21))
+#define SCTLR_ELx_WXN	(BIT(19))
+#define SCTLR_ELx_ENDB	(BIT(13))
+#define SCTLR_ELx_I	(BIT(12))
+#define SCTLR_ELx_SA	(BIT(3))
+#define SCTLR_ELx_C	(BIT(2))
+#define SCTLR_ELx_A	(BIT(1))
+#define SCTLR_ELx_M	(BIT(0))
 
 #define SCTLR_ELx_FLAGS	(SCTLR_ELx_M  | SCTLR_ELx_A | SCTLR_ELx_C | \
 			 SCTLR_ELx_SA | SCTLR_ELx_I | SCTLR_ELx_IESB)
 
 /* SCTLR_EL2 specific flags. */
-#define SCTLR_EL2_RES1	((_BITUL(4))  | (_BITUL(5))  | (_BITUL(11)) | (_BITUL(16)) | \
-			 (_BITUL(18)) | (_BITUL(22)) | (_BITUL(23)) | (_BITUL(28)) | \
-			 (_BITUL(29)))
-#define SCTLR_EL2_RES0	((_BITUL(6))  | (_BITUL(7))  | (_BITUL(8))  | (_BITUL(9))  | \
-			 (_BITUL(10)) | (_BITUL(13)) | (_BITUL(14)) | (_BITUL(15)) | \
-			 (_BITUL(17)) | (_BITUL(20)) | (_BITUL(24)) | (_BITUL(26)) | \
-			 (_BITUL(27)) | (_BITUL(30)) | (_BITUL(31)) | \
+#define SCTLR_EL2_RES1	((BIT(4))  | (BIT(5))  | (BIT(11)) | (BIT(16)) | \
+			 (BIT(18)) | (BIT(22)) | (BIT(23)) | (BIT(28)) | \
+			 (BIT(29)))
+#define SCTLR_EL2_RES0	((BIT(6))  | (BIT(7))  | (BIT(8))  | (BIT(9))  | \
+			 (BIT(10)) | (BIT(13)) | (BIT(14)) | (BIT(15)) | \
+			 (BIT(17)) | (BIT(20)) | (BIT(24)) | (BIT(26)) | \
+			 (BIT(27)) | (BIT(30)) | (BIT(31)) | \
 			 (0xffffefffUL << 32))
 
 #ifdef CONFIG_CPU_BIG_ENDIAN
@@ -524,23 +524,23 @@
 #endif
 
 /* SCTLR_EL1 specific flags. */
-#define SCTLR_EL1_UCI		(_BITUL(26))
-#define SCTLR_EL1_E0E		(_BITUL(24))
-#define SCTLR_EL1_SPAN		(_BITUL(23))
-#define SCTLR_EL1_NTWE		(_BITUL(18))
-#define SCTLR_EL1_NTWI		(_BITUL(16))
-#define SCTLR_EL1_UCT		(_BITUL(15))
-#define SCTLR_EL1_DZE		(_BITUL(14))
-#define SCTLR_EL1_UMA		(_BITUL(9))
-#define SCTLR_EL1_SED		(_BITUL(8))
-#define SCTLR_EL1_ITD		(_BITUL(7))
-#define SCTLR_EL1_CP15BEN	(_BITUL(5))
-#define SCTLR_EL1_SA0		(_BITUL(4))
-
-#define SCTLR_EL1_RES1	((_BITUL(11)) | (_BITUL(20)) | (_BITUL(22)) | (_BITUL(28)) | \
-			 (_BITUL(29)))
-#define SCTLR_EL1_RES0  ((_BITUL(6))  | (_BITUL(10)) | (_BITUL(13)) | (_BITUL(17)) | \
-			 (_BITUL(27)) | (_BITUL(30)) | (_BITUL(31)) | \
+#define SCTLR_EL1_UCI		(BIT(26))
+#define SCTLR_EL1_E0E		(BIT(24))
+#define SCTLR_EL1_SPAN		(BIT(23))
+#define SCTLR_EL1_NTWE		(BIT(18))
+#define SCTLR_EL1_NTWI		(BIT(16))
+#define SCTLR_EL1_UCT		(BIT(15))
+#define SCTLR_EL1_DZE		(BIT(14))
+#define SCTLR_EL1_UMA		(BIT(9))
+#define SCTLR_EL1_SED		(BIT(8))
+#define SCTLR_EL1_ITD		(BIT(7))
+#define SCTLR_EL1_CP15BEN	(BIT(5))
+#define SCTLR_EL1_SA0		(BIT(4))
+
+#define SCTLR_EL1_RES1	((BIT(11)) | (BIT(20)) | (BIT(22)) | (BIT(28)) | \
+			 (BIT(29)))
+#define SCTLR_EL1_RES0  ((BIT(6))  | (BIT(10)) | (BIT(13)) | (BIT(17)) | \
+			 (BIT(27)) | (BIT(30)) | (BIT(31)) | \
 			 (0xffffefffUL << 32))
 
 #ifdef CONFIG_CPU_BIG_ENDIAN
@@ -756,13 +756,13 @@
 #define ZCR_ELx_LEN_SIZE	9
 #define ZCR_ELx_LEN_MASK	0x1ff
 
-#define CPACR_EL1_ZEN_EL1EN	(_BITUL(16)) /* enable EL1 access */
-#define CPACR_EL1_ZEN_EL0EN	(_BITUL(17)) /* enable EL0 access, if EL1EN set */
+#define CPACR_EL1_ZEN_EL1EN	(BIT(16)) /* enable EL1 access */
+#define CPACR_EL1_ZEN_EL0EN	(BIT(17)) /* enable EL0 access, if EL1EN set */
 #define CPACR_EL1_ZEN		(CPACR_EL1_ZEN_EL1EN | CPACR_EL1_ZEN_EL0EN)
 
 
 /* Safe value for MPIDR_EL1: Bit31:RES1, Bit30:U:0, Bit24:MT:0 */
-#define SYS_MPIDR_SAFE_VAL	(_BITUL(31))
+#define SYS_MPIDR_SAFE_VAL	(BIT(31))
 
 #ifdef __ASSEMBLY__
 
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index c8c61b1eb479..9568c116ac7f 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -59,28 +59,6 @@ static inline const struct fault_info *esr_to_debug_fault_info(unsigned int esr)
 	return debug_fault_info + DBG_ESR_EVT(esr);
 }
 
-#ifdef CONFIG_KPROBES
-static inline int notify_page_fault(struct pt_regs *regs, unsigned int esr)
-{
-	int ret = 0;
-
-	/* kprobe_running() needs smp_processor_id() */
-	if (!user_mode(regs)) {
-		preempt_disable();
-		if (kprobe_running() && kprobe_fault_handler(regs, esr))
-			ret = 1;
-		preempt_enable();
-	}
-
-	return ret;
-}
-#else
-static inline int notify_page_fault(struct pt_regs *regs, unsigned int esr)
-{
-	return 0;
-}
-#endif
-
 static void data_abort_decode(unsigned int esr)
 {
 	pr_alert("Data abort info:\n");
@@ -434,7 +412,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 	unsigned long vm_flags = VM_READ | VM_WRITE;
 	unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
-	if (notify_page_fault(regs, esr))
+	if (kprobe_page_fault(regs, esr))
 		return 0;
 
 	/*
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 1b49c08dfa2b..e661469cabdd 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -942,6 +942,11 @@ void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
 	return dt_virt;
 }
 
+int __init arch_ioremap_p4d_supported(void)
+{
+	return 0;
+}
+
 int __init arch_ioremap_pud_supported(void)
 {
 	/*