Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull straggler x86 fixes from Peter Anvin:
 "Three groups of patches:

  - EFI boot stub documentation and the ability to print error messages;
  - Removal for PTRACE_ARCH_PRCTL for x32 (obsolete interface which
    should never have been ported, and the port is broken and
    potentially dangerous.)
  - ftrace stack corruption fixes.  I'm not super-happy about the
    technical implementation, but it is probably the least invasive in
    the short term.  In the future I would like a single method for
    nesting the debug stack, however."

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32
  x86, efi: Add EFI boot stub documentation
  x86, efi; Add EFI boot stub console support
  x86, efi: Only close open files in error path
  ftrace/x86: Do not change stacks in DEBUG when calling lockdep
  x86: Allow nesting of the debug stack IDT setting
  x86: Reset the debug_stack update counter
  ftrace: Use breakpoint method to update ftrace caller
  ftrace: Synchronize variable setting with breakpoints

1 files changed, 70 insertions, 17 deletions

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 2c14e76bb4c7..4e85f5f85837 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -16,6 +16,26 @@
 
 static efi_system_table_t *sys_table;
 
+static void efi_printk(char *str)
+{
+	char *s8;
+
+	for (s8 = str; *s8; s8++) {
+		struct efi_simple_text_output_protocol *out;
+		efi_char16_t ch[2] = { 0 };
+
+		ch[0] = *s8;
+		out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
+
+		if (*s8 == '\n') {
+			efi_char16_t nl[2] = { '\r', 0 };
+			efi_call_phys2(out->output_string, out, nl);
+		}
+
+		efi_call_phys2(out->output_string, out, ch);
+	}
+}
+
 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
 			      unsigned long *desc_size)
 {
@@ -531,8 +551,10 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
 				EFI_LOADER_DATA,
 				nr_initrds * sizeof(*initrds),
 				&initrds);
-	if (status != EFI_SUCCESS)
+	if (status != EFI_SUCCESS) {
+		efi_printk("Failed to alloc mem for initrds\n");
 		goto fail;
+	}
 
 	str = (char *)(unsigned long)hdr->cmd_line_ptr;
 	for (i = 0; i < nr_initrds; i++) {
@@ -575,32 +597,42 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
 
 			status = efi_call_phys3(boottime->handle_protocol,
 					image->device_handle, &fs_proto, &io);
-			if (status != EFI_SUCCESS)
+			if (status != EFI_SUCCESS) {
+				efi_printk("Failed to handle fs_proto\n");
 				goto free_initrds;
+			}
 
 			status = efi_call_phys2(io->open_volume, io, &fh);
-			if (status != EFI_SUCCESS)
+			if (status != EFI_SUCCESS) {
+				efi_printk("Failed to open volume\n");
 				goto free_initrds;
+			}
 		}
 
 		status = efi_call_phys5(fh->open, fh, &h, filename_16,
 					EFI_FILE_MODE_READ, (u64)0);
-		if (status != EFI_SUCCESS)
+		if (status != EFI_SUCCESS) {
+			efi_printk("Failed to open initrd file\n");
 			goto close_handles;
+		}
 
 		initrd->handle = h;
 
 		info_sz = 0;
 		status = efi_call_phys4(h->get_info, h, &info_guid,
 					&info_sz, NULL);
-		if (status != EFI_BUFFER_TOO_SMALL)
+		if (status != EFI_BUFFER_TOO_SMALL) {
+			efi_printk("Failed to get initrd info size\n");
 			goto close_handles;
+		}
 
 grow:
 		status = efi_call_phys3(sys_table->boottime->allocate_pool,
 					EFI_LOADER_DATA, info_sz, &info);
-		if (status != EFI_SUCCESS)
+		if (status != EFI_SUCCESS) {
+			efi_printk("Failed to alloc mem for initrd info\n");
 			goto close_handles;
+		}
 
 		status = efi_call_phys4(h->get_info, h, &info_guid,
 					&info_sz, info);
@@ -612,8 +644,10 @@ grow:
 		file_sz = info->file_size;
 		efi_call_phys1(sys_table->boottime->free_pool, info);
 
-		if (status != EFI_SUCCESS)
+		if (status != EFI_SUCCESS) {
+			efi_printk("Failed to get initrd info\n");
 			goto close_handles;
+		}
 
 		initrd->size = file_sz;
 		initrd_total += file_sz;
@@ -629,11 +663,14 @@ grow:
 		 */
 		status = high_alloc(initrd_total, 0x1000,
 				   &initrd_addr, hdr->initrd_addr_max);
-		if (status != EFI_SUCCESS)
+		if (status != EFI_SUCCESS) {
+			efi_printk("Failed to alloc highmem for initrds\n");
 			goto close_handles;
+		}
 
 		/* We've run out of free low memory. */
 		if (initrd_addr > hdr->initrd_addr_max) {
+			efi_printk("We've run out of free low memory\n");
 			status = EFI_INVALID_PARAMETER;
 			goto free_initrd_total;
 		}
@@ -652,8 +689,10 @@ grow:
 				status = efi_call_phys3(fh->read,
 							initrds[j].handle,
 							&chunksize, addr);
-				if (status != EFI_SUCCESS)
+				if (status != EFI_SUCCESS) {
+					efi_printk("Failed to read initrd\n");
 					goto free_initrd_total;
+				}
 				addr += chunksize;
 				size -= chunksize;
 			}
@@ -674,7 +713,7 @@ free_initrd_total:
 	low_free(initrd_total, initrd_addr);
 
 close_handles:
-	for (k = j; k < nr_initrds; k++)
+	for (k = j; k < i; k++)
 		efi_call_phys1(fh->close, initrds[k].handle);
 free_initrds:
 	efi_call_phys1(sys_table->boottime->free_pool, initrds);
@@ -732,8 +771,10 @@ static efi_status_t make_boot_params(struct boot_params *boot_params,
 			options_size++;	/* NUL termination */
 
 			status = low_alloc(options_size, 1, &cmdline);
-			if (status != EFI_SUCCESS)
+			if (status != EFI_SUCCESS) {
+				efi_printk("Failed to alloc mem for cmdline\n");
 				goto fail;
+			}
 
 			s1 = (u8 *)(unsigned long)cmdline;
 			s2 = (u16 *)options;
@@ -895,12 +936,16 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
 
 	status = efi_call_phys3(sys_table->boottime->handle_protocol,
 				handle, &proto, (void *)&image);
-	if (status != EFI_SUCCESS)
+	if (status != EFI_SUCCESS) {
+		efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 		goto fail;
+	}
 
 	status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
-	if (status != EFI_SUCCESS)
+	if (status != EFI_SUCCESS) {
+		efi_printk("Failed to alloc lowmem for boot params\n");
 		goto fail;
+	}
 
 	memset(boot_params, 0x0, 0x4000);
 
@@ -933,8 +978,10 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
 	if (status != EFI_SUCCESS) {
 		status = low_alloc(hdr->init_size, hdr->kernel_alignment,
 				   &start);
-		if (status != EFI_SUCCESS)
+		if (status != EFI_SUCCESS) {
+			efi_printk("Failed to alloc mem for kernel\n");
 			goto fail;
+		}
 	}
 
 	hdr->code32_start = (__u32)start;
@@ -945,19 +992,25 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
 	status = efi_call_phys3(sys_table->boottime->allocate_pool,
 				EFI_LOADER_DATA, sizeof(*gdt),
 				(void **)&gdt);
-	if (status != EFI_SUCCESS)
+	if (status != EFI_SUCCESS) {
+		efi_printk("Failed to alloc mem for gdt structure\n");
 		goto fail;
+	}
 
 	gdt->size = 0x800;
 	status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
-	if (status != EFI_SUCCESS)
+	if (status != EFI_SUCCESS) {
+		efi_printk("Failed to alloc mem for gdt\n");
 		goto fail;
+	}
 
 	status = efi_call_phys3(sys_table->boottime->allocate_pool,
 				EFI_LOADER_DATA, sizeof(*idt),
 				(void **)&idt);
-	if (status != EFI_SUCCESS)
+	if (status != EFI_SUCCESS) {
+		efi_printk("Failed to alloc mem for idt structure\n");
 		goto fail;
+	}
 
 	idt->size = 0;
 	idt->address = 0;