Merge branch 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:
 "Many great new features, fixes and optimizations, including:

   - Convert page table updates to use per-pagetable spinlocks which
     overall improves performance on SMP machines a lot, by Mikulas
     Patocka

   - Kernel debugger (KGDB) support, by Sven Schnelle

   - KPROBES support, by Sven Schnelle

   - Lots of TLB lock/flush improvements, by Dave Anglin

   - Drop DISCONTIGMEM and switch to SPARSEMEM

   - Added JUMP_LABEL, branch runtime-patching support

   - Lots of other small speedups and cleanups, e.g. for QEMU, stack
     randomization, avoidance of name clashes, documentation updates,
     etc ..."

* 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (28 commits)
  parisc: Add static branch and JUMP_LABEL feature
  parisc: Use PA_ASM_LEVEL in boot code
  parisc: Rename LEVEL to PA_ASM_LEVEL to avoid name clash with DRBD code
  parisc: Update huge TLB page support to use per-pagetable spinlock
  parisc: Use per-pagetable spinlock
  parisc: Allow live-patching of __meminit functions
  parisc: Add memory barrier to asm pdc and sync instructions
  parisc: Add memory clobber to TLB purges
  parisc: Use ldcw instruction for SMP spinlock release barrier
  parisc: Remove lock code to serialize TLB operations in pacache.S
  parisc: Switch from DISCONTIGMEM to SPARSEMEM
  parisc: enable wide mode early
  parisc: update feature lists
  parisc: Show n/a if product number not available
  parisc: remove unused flags parameter in __patch_text()
  doc: update kprobes supported architecture list
  parisc: Implement kretprobes
  parisc: remove kprobes.h from generic-y
  parisc: Implement kprobes
  parisc: add functions required by KPROBE_EVENTS
  ...

Author: torvalds

Documentation/features/debug/kgdb/arch-support.txt

@@ -21,7 +21,7 @@
     |       nds32: | TODO |
     |       nios2: |  ok  |
     |    openrisc: | TODO |
-    |      parisc: | TODO |
+    |      parisc: |  ok  |
     |     powerpc: |  ok  |
     |       riscv: | TODO |
     |        s390: | TODO |

Documentation/features/debug/kprobes/arch-support.txt

@@ -21,7 +21,7 @@
     |       nds32: | TODO |
     |       nios2: | TODO |
     |    openrisc: | TODO |
-    |      parisc: | TODO |
+    |      parisc: |  ok  |
     |     powerpc: |  ok  |
     |       riscv: |  ok  |
     |        s390: |  ok  |

Documentation/features/debug/kretprobes/arch-support.txt

@@ -21,7 +21,7 @@
     |       nds32: | TODO |
     |       nios2: | TODO |
     |    openrisc: | TODO |
-    |      parisc: | TODO |
+    |      parisc: |  ok  |
     |     powerpc: |  ok  |
     |       riscv: | TODO |
     |        s390: |  ok  |

Documentation/kprobes.txt

@@ -321,6 +321,7 @@ architectures:
 - ppc
 - mips
 - s390
+- parisc
 
 Configuring Kprobes
 ===================

arch/parisc/Kconfig

@@ -36,6 +36,7 @@ config PARISC
 	select GENERIC_STRNCPY_FROM_USER
 	select SYSCTL_ARCH_UNALIGN_ALLOW
 	select SYSCTL_EXCEPTION_TRACE
+	select ARCH_DISCARD_MEMBLOCK
 	select HAVE_MOD_ARCH_SPECIFIC
 	select VIRT_TO_BUS
 	select MODULES_USE_ELF_RELA
@@ -44,6 +45,8 @@ config PARISC
 	select HAVE_DEBUG_STACKOVERFLOW
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_HASH
+	select HAVE_ARCH_JUMP_LABEL
+	select HAVE_ARCH_JUMP_LABEL_RELATIVE
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_REGS_AND_STACK_ACCESS_API
@@ -54,6 +57,9 @@ config PARISC
 	select CPU_NO_EFFICIENT_FFS
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
+	select HAVE_ARCH_KGDB
+	select HAVE_KPROBES
+	select HAVE_KRETPROBES
 
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
@@ -305,21 +311,16 @@ config ARCH_SELECT_MEMORY_MODEL
 	def_bool y
 	depends on 64BIT
 
-config ARCH_DISCONTIGMEM_ENABLE
+config ARCH_SPARSEMEM_ENABLE
 	def_bool y
 	depends on 64BIT
 
 config ARCH_FLATMEM_ENABLE
 	def_bool y
 
-config ARCH_DISCONTIGMEM_DEFAULT
+config ARCH_SPARSEMEM_DEFAULT
 	def_bool y
-	depends on ARCH_DISCONTIGMEM_ENABLE
-
-config NODES_SHIFT
-	int
-	default "3"
-	depends on NEED_MULTIPLE_NODES
+	depends on ARCH_SPARSEMEM_ENABLE
 
 source "kernel/Kconfig.hz"
 

arch/parisc/boot/compressed/head.S

@@ -22,7 +22,7 @@
 	__HEAD
 
 ENTRY(startup)
-	 .level LEVEL
+	 .level PA_ASM_LEVEL
 
 #define PSW_W_SM	0x200
 #define PSW_W_BIT       36
@@ -63,7 +63,7 @@ $bss_loop:
 	load32	BOOTADDR(decompress_kernel),%r3
 
 #ifdef CONFIG_64BIT
-	.level LEVEL
+	.level PA_ASM_LEVEL
 	ssm	PSW_W_SM, %r0		/* set W-bit */
 	depdi	0, 31, 32, %r3
 #endif
@@ -72,7 +72,7 @@ $bss_loop:
 
 startup_continue:
 #ifdef CONFIG_64BIT
-	.level LEVEL
+	.level PA_ASM_LEVEL
 	rsm	PSW_W_SM, %r0		/* clear W-bit */
 #endif
 

arch/parisc/boot/compressed/misc.c

@@ -145,27 +145,28 @@ static int putchar(int c)
 
 void __noreturn error(char *x)
 {
-	puts("\n\n");
-	puts(x);
-	puts("\n\n -- System halted");
+	if (x) puts(x);
+	puts("\n -- System halted\n");
 	while (1)	/* wait forever */
 		;
 }
 
-static int print_hex(unsigned long num)
+static int print_num(unsigned long num, int base)
 {
 	const char hex[] = "0123456789abcdef";
 	char str[40];
 	int i = sizeof(str)-1;
 
 	str[i--] = '\0';
 	do {
-		str[i--] = hex[num & 0x0f];
-		num >>= 4;
+		str[i--] = hex[num % base];
+		num = num / base;
 	} while (num);
 
-	str[i--] = 'x';
-	str[i] = '0';
+	if (base == 16) {
+		str[i--] = 'x';
+		str[i] = '0';
+	} else i++;
 	puts(&str[i]);
 
 	return 0;
@@ -187,8 +188,9 @@ int printf(const char *fmt, ...)
 
 		if (fmt[++i] == '%')
 			goto put;
+		print_num(va_arg(args, unsigned long),
+			fmt[i] == 'x' ? 16:10);
 		++i;
-		print_hex(va_arg(args, unsigned long));
 	}
 
 	va_end(args);
@@ -327,8 +329,15 @@ unsigned long decompress_kernel(unsigned int started_wide,
 		free_mem_end_ptr = rd_start;
 #endif
 
-	if (free_mem_ptr >= free_mem_end_ptr)
-		error("Kernel too big for machine.");
+	if (free_mem_ptr >= free_mem_end_ptr) {
+		int free_ram;
+		free_ram = (free_mem_ptr >> 20) + 1;
+		if (free_ram < 32)
+			free_ram = 32;
+		printf("\nKernel requires at least %d MB RAM.\n",
+			free_ram);
+		error(NULL);
+	}
 
 #ifdef DEBUG
 	printf("\n");

arch/parisc/include/asm/Kbuild

@@ -10,7 +10,6 @@ generic-y += hw_irq.h
 generic-y += irq_regs.h
 generic-y += irq_work.h
 generic-y += kdebug.h
-generic-y += kprobes.h
 generic-y += kvm_para.h
 generic-y += local.h
 generic-y += local64.h

arch/parisc/include/asm/assembly.h

@@ -61,14 +61,14 @@
 #define LDCW		ldcw,co
 #define BL		b,l
 # ifdef CONFIG_64BIT
-#  define LEVEL		2.0w
+#  define PA_ASM_LEVEL	2.0w
 # else
-#  define LEVEL		2.0
+#  define PA_ASM_LEVEL	2.0
 # endif
 #else
 #define LDCW		ldcw
 #define BL		bl
-#define LEVEL		1.1
+#define PA_ASM_LEVEL	1.1
 #endif
 
 #ifdef __ASSEMBLY__

arch/parisc/include/asm/cache.h

@@ -44,22 +44,22 @@ void parisc_setup_cache_timing(void);
 
 #define pdtlb(addr)	asm volatile("pdtlb 0(%%sr1,%0)" \
 			ALTERNATIVE(ALT_COND_NO_SMP, INSN_PxTLB) \
-			: : "r" (addr))
+			: : "r" (addr) : "memory")
 #define pitlb(addr)	asm volatile("pitlb 0(%%sr1,%0)" \
 			ALTERNATIVE(ALT_COND_NO_SMP, INSN_PxTLB) \
 			ALTERNATIVE(ALT_COND_NO_SPLIT_TLB, INSN_NOP) \
-			: : "r" (addr))
+			: : "r" (addr) : "memory")
 #define pdtlb_kernel(addr)  asm volatile("pdtlb 0(%0)"   \
 			ALTERNATIVE(ALT_COND_NO_SMP, INSN_PxTLB) \
-			: : "r" (addr))
+			: : "r" (addr) : "memory")
 
 #define asm_io_fdc(addr) asm volatile("fdc %%r0(%0)" \
 			ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \
 			ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) \
-			: : "r" (addr))
+			: : "r" (addr) : "memory")
 #define asm_io_sync()	asm volatile("sync" \
 			ALTERNATIVE(ALT_COND_NO_DCACHE, INSN_NOP) \
-			ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) :: )
+			ALTERNATIVE(ALT_COND_NO_IOC_FDC, INSN_NOP) :::"memory")
 
 #endif /* ! __ASSEMBLY__ */