Merge branch 'for-next/misc' into for-next/core

Miscellaneous arm64 changes for 5.12.

* for-next/misc:
  arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+
  arm64: vmlinux.ld.S: add assertion for tramp_pg_dir offset
  arm64: vmlinux.ld.S: add assertion for reserved_pg_dir offset
  arm64/ptdump:display the Linear Mapping start marker
  arm64: ptrace: Fix missing return in hw breakpoint code
  KVM: arm64: Move __hyp_set_vectors out of .hyp.text
  arm64: Include linux/io.h in mm/mmap.c
  arm64: cacheflush: Remove stale comment
  arm64: mm: Remove unused header file
  arm64/sparsemem: reduce SECTION_SIZE_BITS
  arm64/mm: Add warning for outside range requests in vmemmap_populate()
  arm64: Drop workaround for broken 'S' constraint with GCC 4.9

arch/arm64/Kconfig

@@ -952,8 +952,9 @@ choice
 	  that is selected here.
 
 config CPU_BIG_ENDIAN
-       bool "Build big-endian kernel"
-       help
+	bool "Build big-endian kernel"
+	depends on !LD_IS_LLD || LLD_VERSION >= 130000
+	help
 	  Say Y if you plan on running a kernel with a big-endian userspace.
 
 config CPU_LITTLE_ENDIAN

arch/arm64/include/asm/asm-uaccess.h

@@ -15,10 +15,10 @@
 	.macro	__uaccess_ttbr0_disable, tmp1
 	mrs	\tmp1, ttbr1_el1			// swapper_pg_dir
 	bic	\tmp1, \tmp1, #TTBR_ASID_MASK
-	sub	\tmp1, \tmp1, #PAGE_SIZE		// reserved_pg_dir just before swapper_pg_dir
+	sub	\tmp1, \tmp1, #RESERVED_SWAPPER_OFFSET	// reserved_pg_dir
 	msr	ttbr0_el1, \tmp1			// set reserved TTBR0_EL1
 	isb
-	add	\tmp1, \tmp1, #PAGE_SIZE
+	add	\tmp1, \tmp1, #RESERVED_SWAPPER_OFFSET
 	msr	ttbr1_el1, \tmp1		// set reserved ASID
 	isb
 	.endm

arch/arm64/include/asm/cacheflush.h

@@ -30,11 +30,6 @@
  *	the implementation assumes non-aliasing VIPT D-cache and (aliasing)
  *	VIPT I-cache.
  *
- *	flush_cache_mm(mm)
- *
- *		Clean and invalidate all user space cache entries
- *		before a change of page tables.
- *
  *	flush_icache_range(start, end)
  *
  *		Ensure coherency between the I-cache and the D-cache in the

arch/arm64/include/asm/kvm_asm.h

@@ -199,12 +199,6 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
-#if defined(GCC_VERSION) && GCC_VERSION < 50000
-#define SYM_CONSTRAINT	"i"
-#else
-#define SYM_CONSTRAINT	"S"
-#endif
-
 /*
  * Obtain the PC-relative address of a kernel symbol
  * s: symbol
@@ -221,7 +215,7 @@ extern u32 __kvm_get_mdcr_el2(void);
 		typeof(s) *addr;					\
 		asm("adrp	%0, %1\n"				\
 		    "add	%0, %0, :lo12:%1\n"			\
-		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
+		    : "=r" (addr) : "S" (&s));				\
 		addr;							\
 	})
 

arch/arm64/include/asm/memory.h

@@ -159,6 +159,18 @@
 #define IOREMAP_MAX_ORDER	(PMD_SHIFT)
 #endif
 
+/*
+ *  Open-coded (swapper_pg_dir - reserved_pg_dir) as this cannot be calculated
+ *  until link time.
+ */
+#define RESERVED_SWAPPER_OFFSET	(PAGE_SIZE)
+
+/*
+ *  Open-coded (swapper_pg_dir - tramp_pg_dir) as this cannot be calculated
+ *  until link time.
+ */
+#define TRAMP_SWAPPER_OFFSET	(2 * PAGE_SIZE)
+
 #ifndef __ASSEMBLY__
 
 #include <linux/bitops.h>

arch/arm64/include/asm/sparsemem.h

@@ -7,7 +7,26 @@
 
 #ifdef CONFIG_SPARSEMEM
 #define MAX_PHYSMEM_BITS	CONFIG_ARM64_PA_BITS
-#define SECTION_SIZE_BITS	30
-#endif
+
+/*
+ * Section size must be at least 512MB for 64K base
+ * page size config. Otherwise it will be less than
+ * (MAX_ORDER - 1) and the build process will fail.
+ */
+#ifdef CONFIG_ARM64_64K_PAGES
+#define SECTION_SIZE_BITS 29
+
+#else
+
+/*
+ * Section size must be at least 128MB for 4K base
+ * page size config. Otherwise PMD based huge page
+ * entries could not be created for vmemmap mappings.
+ * 16K follows 4K for simplicity.
+ */
+#define SECTION_SIZE_BITS 27
+#endif /* CONFIG_ARM64_64K_PAGES */
+
+#endif /* CONFIG_SPARSEMEM*/
 
 #endif

arch/arm64/include/asm/uaccess.h

@@ -87,7 +87,7 @@ static inline void __uaccess_ttbr0_disable(void)
 	ttbr = read_sysreg(ttbr1_el1);
 	ttbr &= ~TTBR_ASID_MASK;
 	/* reserved_pg_dir placed before swapper_pg_dir */
-	write_sysreg(ttbr - PAGE_SIZE, ttbr0_el1);
+	write_sysreg(ttbr - RESERVED_SWAPPER_OFFSET, ttbr0_el1);
 	isb();
 	/* Set reserved ASID */
 	write_sysreg(ttbr, ttbr1_el1);

arch/arm64/kernel/entry.S

@@ -805,7 +805,7 @@ SYM_CODE_END(ret_to_user)
 	// Move from tramp_pg_dir to swapper_pg_dir
 	.macro tramp_map_kernel, tmp
 	mrs	\tmp, ttbr1_el1
-	add	\tmp, \tmp, #(2 * PAGE_SIZE)
+	add	\tmp, \tmp, #TRAMP_SWAPPER_OFFSET
 	bic	\tmp, \tmp, #USER_ASID_FLAG
 	msr	ttbr1_el1, \tmp
 #ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
@@ -825,7 +825,7 @@ alternative_else_nop_endif
 	// Move from swapper_pg_dir to tramp_pg_dir
 	.macro tramp_unmap_kernel, tmp
 	mrs	\tmp, ttbr1_el1
-	sub	\tmp, \tmp, #(2 * PAGE_SIZE)
+	sub	\tmp, \tmp, #TRAMP_SWAPPER_OFFSET
 	orr	\tmp, \tmp, #USER_ASID_FLAG
 	msr	ttbr1_el1, \tmp
 	/*

arch/arm64/kernel/hyp-stub.S

@@ -170,6 +170,8 @@ SYM_CODE_END(\label)
 	invalid_vector	el1_fiq_invalid
 	invalid_vector	el1_error_invalid
 
+	.popsection
+
 /*
  * __hyp_set_vectors: Call this after boot to set the initial hypervisor
  * vectors as part of hypervisor installation.  On an SMP system, this should

arch/arm64/kernel/ptrace.c

@@ -194,6 +194,7 @@ static void ptrace_hbptriggered(struct perf_event *bp,
 		}
 		arm64_force_sig_ptrace_errno_trap(si_errno, bkpt->trigger,
 						  desc);
+		return;
 	}
 #endif
 	arm64_force_sig_fault(SIGTRAP, TRAP_HWBKPT, bkpt->trigger, desc);

arch/arm64/kernel/vmlinux.lds.S

@@ -316,3 +316,11 @@ ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE,
  * If padding is applied before .head.text, virt<->phys conversions will fail.
  */
 ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned")
+
+ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET,
+       "RESERVED_SWAPPER_OFFSET is wrong!")
+
+#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
+ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET,
+       "TRAMP_SWAPPER_OFFSET is wrong!")
+#endif

arch/arm64/mm/mmap.c

@@ -5,20 +5,11 @@
  * Copyright (C) 2012 ARM Ltd.
  */
 
-#include <linux/elf.h>
-#include <linux/fs.h>
-#include <linux/memblock.h>
-#include <linux/mm.h>
-#include <linux/mman.h>
-#include <linux/export.h>
-#include <linux/shm.h>
-#include <linux/sched/signal.h>
-#include <linux/sched/mm.h>
 #include <linux/io.h>
-#include <linux/personality.h>
-#include <linux/random.h>
+#include <linux/memblock.h>
+#include <linux/types.h>
 
-#include <asm/cputype.h>
+#include <asm/page.h>
 
 /*
  * You really shouldn't be using read() or write() on /dev/mem.  This might go

arch/arm64/mm/mmu.c

@@ -1094,6 +1094,7 @@ static void free_empty_tables(unsigned long addr, unsigned long end,
 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 		struct vmem_altmap *altmap)
 {
+	WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END));
 	return vmemmap_populate_basepages(start, end, node, altmap);
 }
 #else	/* !ARM64_SWAPPER_USES_SECTION_MAPS */
@@ -1107,6 +1108,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 	pud_t *pudp;
 	pmd_t *pmdp;
 
+	WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END));
 	do {
 		next = pmd_addr_end(addr, end);
 

arch/arm64/mm/ptdump.c

@@ -324,6 +324,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info)
 	st = (struct pg_state){
 		.seq = s,
 		.marker = info->markers,
+		.level = -1,
 		.ptdump = {
 			.note_page = note_page,
 			.range = (struct ptdump_range[]){