diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/hypfs/hypfs_diag.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/hypfs/hypfs_diag.c | 778 |
1 files changed, 0 insertions, 778 deletions
diff --git a/ANDROID_3.4.5/arch/s390/hypfs/hypfs_diag.c b/ANDROID_3.4.5/arch/s390/hypfs/hypfs_diag.c deleted file mode 100644 index 74c8f5e7..00000000 --- a/ANDROID_3.4.5/arch/s390/hypfs/hypfs_diag.c +++ /dev/null @@ -1,778 +0,0 @@ -/* - * arch/s390/hypfs/hypfs_diag.c - * Hypervisor filesystem for Linux on s390. Diag 204 and 224 - * implementation. - * - * Copyright IBM Corp. 2006, 2008 - * Author(s): Michael Holzheu <holzheu@de.ibm.com> - */ - -#define KMSG_COMPONENT "hypfs" -#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt - -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/vmalloc.h> -#include <linux/mm.h> -#include <asm/ebcdic.h> -#include "hypfs.h" - -#define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */ -#define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */ -#define TMP_SIZE 64 /* size of temporary buffers */ - -#define DBFS_D204_HDR_VERSION 0 - -/* diag 204 subcodes */ -enum diag204_sc { - SUBC_STIB4 = 4, - SUBC_RSI = 5, - SUBC_STIB6 = 6, - SUBC_STIB7 = 7 -}; - -/* The two available diag 204 data formats */ -enum diag204_format { - INFO_SIMPLE = 0, - INFO_EXT = 0x00010000 -}; - -/* bit is set in flags, when physical cpu info is included in diag 204 data */ -#define LPAR_PHYS_FLG 0x80 - -static char *diag224_cpu_names; /* diag 224 name table */ -static enum diag204_sc diag204_store_sc; /* used subcode for store */ -static enum diag204_format diag204_info_type; /* used diag 204 data format */ - -static void *diag204_buf; /* 4K aligned buffer for diag204 data */ -static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */ -static int diag204_buf_pages; /* number of pages for diag204 data */ - -static struct dentry *dbfs_d204_file; - -/* - * DIAG 204 data structures and member access functions. - * - * Since we have two different diag 204 data formats for old and new s390 - * machines, we do not access the structs directly, but use getter functions for - * each struct member instead. This should make the code more readable. - */ - -/* Time information block */ - -struct info_blk_hdr { - __u8 npar; - __u8 flags; - __u16 tslice; - __u16 phys_cpus; - __u16 this_part; - __u64 curtod; -} __attribute__ ((packed)); - -struct x_info_blk_hdr { - __u8 npar; - __u8 flags; - __u16 tslice; - __u16 phys_cpus; - __u16 this_part; - __u64 curtod1; - __u64 curtod2; - char reserved[40]; -} __attribute__ ((packed)); - -static inline int info_blk_hdr__size(enum diag204_format type) -{ - if (type == INFO_SIMPLE) - return sizeof(struct info_blk_hdr); - else /* INFO_EXT */ - return sizeof(struct x_info_blk_hdr); -} - -static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct info_blk_hdr *)hdr)->npar; - else /* INFO_EXT */ - return ((struct x_info_blk_hdr *)hdr)->npar; -} - -static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct info_blk_hdr *)hdr)->flags; - else /* INFO_EXT */ - return ((struct x_info_blk_hdr *)hdr)->flags; -} - -static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct info_blk_hdr *)hdr)->phys_cpus; - else /* INFO_EXT */ - return ((struct x_info_blk_hdr *)hdr)->phys_cpus; -} - -/* Partition header */ - -struct part_hdr { - __u8 pn; - __u8 cpus; - char reserved[6]; - char part_name[LPAR_NAME_LEN]; -} __attribute__ ((packed)); - -struct x_part_hdr { - __u8 pn; - __u8 cpus; - __u8 rcpus; - __u8 pflag; - __u32 mlu; - char part_name[LPAR_NAME_LEN]; - char lpc_name[8]; - char os_name[8]; - __u64 online_cs; - __u64 online_es; - __u8 upid; - char reserved1[3]; - __u32 group_mlu; - char group_name[8]; - char reserved2[32]; -} __attribute__ ((packed)); - -static inline int part_hdr__size(enum diag204_format type) -{ - if (type == INFO_SIMPLE) - return sizeof(struct part_hdr); - else /* INFO_EXT */ - return sizeof(struct x_part_hdr); -} - -static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct part_hdr *)hdr)->cpus; - else /* INFO_EXT */ - return ((struct x_part_hdr *)hdr)->rcpus; -} - -static inline void part_hdr__part_name(enum diag204_format type, void *hdr, - char *name) -{ - if (type == INFO_SIMPLE) - memcpy(name, ((struct part_hdr *)hdr)->part_name, - LPAR_NAME_LEN); - else /* INFO_EXT */ - memcpy(name, ((struct x_part_hdr *)hdr)->part_name, - LPAR_NAME_LEN); - EBCASC(name, LPAR_NAME_LEN); - name[LPAR_NAME_LEN] = 0; - strim(name); -} - -struct cpu_info { - __u16 cpu_addr; - char reserved1[2]; - __u8 ctidx; - __u8 cflag; - __u16 weight; - __u64 acc_time; - __u64 lp_time; -} __attribute__ ((packed)); - -struct x_cpu_info { - __u16 cpu_addr; - char reserved1[2]; - __u8 ctidx; - __u8 cflag; - __u16 weight; - __u64 acc_time; - __u64 lp_time; - __u16 min_weight; - __u16 cur_weight; - __u16 max_weight; - char reseved2[2]; - __u64 online_time; - __u64 wait_time; - __u32 pma_weight; - __u32 polar_weight; - char reserved3[40]; -} __attribute__ ((packed)); - -/* CPU info block */ - -static inline int cpu_info__size(enum diag204_format type) -{ - if (type == INFO_SIMPLE) - return sizeof(struct cpu_info); - else /* INFO_EXT */ - return sizeof(struct x_cpu_info); -} - -static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct cpu_info *)hdr)->ctidx; - else /* INFO_EXT */ - return ((struct x_cpu_info *)hdr)->ctidx; -} - -static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct cpu_info *)hdr)->cpu_addr; - else /* INFO_EXT */ - return ((struct x_cpu_info *)hdr)->cpu_addr; -} - -static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct cpu_info *)hdr)->acc_time; - else /* INFO_EXT */ - return ((struct x_cpu_info *)hdr)->acc_time; -} - -static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct cpu_info *)hdr)->lp_time; - else /* INFO_EXT */ - return ((struct x_cpu_info *)hdr)->lp_time; -} - -static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return 0; /* online_time not available in simple info */ - else /* INFO_EXT */ - return ((struct x_cpu_info *)hdr)->online_time; -} - -/* Physical header */ - -struct phys_hdr { - char reserved1[1]; - __u8 cpus; - char reserved2[6]; - char mgm_name[8]; -} __attribute__ ((packed)); - -struct x_phys_hdr { - char reserved1[1]; - __u8 cpus; - char reserved2[6]; - char mgm_name[8]; - char reserved3[80]; -} __attribute__ ((packed)); - -static inline int phys_hdr__size(enum diag204_format type) -{ - if (type == INFO_SIMPLE) - return sizeof(struct phys_hdr); - else /* INFO_EXT */ - return sizeof(struct x_phys_hdr); -} - -static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct phys_hdr *)hdr)->cpus; - else /* INFO_EXT */ - return ((struct x_phys_hdr *)hdr)->cpus; -} - -/* Physical CPU info block */ - -struct phys_cpu { - __u16 cpu_addr; - char reserved1[2]; - __u8 ctidx; - char reserved2[3]; - __u64 mgm_time; - char reserved3[8]; -} __attribute__ ((packed)); - -struct x_phys_cpu { - __u16 cpu_addr; - char reserved1[2]; - __u8 ctidx; - char reserved2[3]; - __u64 mgm_time; - char reserved3[80]; -} __attribute__ ((packed)); - -static inline int phys_cpu__size(enum diag204_format type) -{ - if (type == INFO_SIMPLE) - return sizeof(struct phys_cpu); - else /* INFO_EXT */ - return sizeof(struct x_phys_cpu); -} - -static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct phys_cpu *)hdr)->cpu_addr; - else /* INFO_EXT */ - return ((struct x_phys_cpu *)hdr)->cpu_addr; -} - -static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct phys_cpu *)hdr)->mgm_time; - else /* INFO_EXT */ - return ((struct x_phys_cpu *)hdr)->mgm_time; -} - -static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr) -{ - if (type == INFO_SIMPLE) - return ((struct phys_cpu *)hdr)->ctidx; - else /* INFO_EXT */ - return ((struct x_phys_cpu *)hdr)->ctidx; -} - -/* Diagnose 204 functions */ - -static int diag204(unsigned long subcode, unsigned long size, void *addr) -{ - register unsigned long _subcode asm("0") = subcode; - register unsigned long _size asm("1") = size; - - asm volatile( - " diag %2,%0,0x204\n" - "0:\n" - EX_TABLE(0b,0b) - : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory"); - if (_subcode) - return -1; - return _size; -} - -/* - * For the old diag subcode 4 with simple data format we have to use real - * memory. If we use subcode 6 or 7 with extended data format, we can (and - * should) use vmalloc, since we need a lot of memory in that case. Currently - * up to 93 pages! - */ - -static void diag204_free_buffer(void) -{ - if (!diag204_buf) - return; - if (diag204_buf_vmalloc) { - vfree(diag204_buf_vmalloc); - diag204_buf_vmalloc = NULL; - } else { - free_pages((unsigned long) diag204_buf, 0); - } - diag204_buf = NULL; -} - -static void *page_align_ptr(void *ptr) -{ - return (void *) PAGE_ALIGN((unsigned long) ptr); -} - -static void *diag204_alloc_vbuf(int pages) -{ - /* The buffer has to be page aligned! */ - diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1)); - if (!diag204_buf_vmalloc) - return ERR_PTR(-ENOMEM); - diag204_buf = page_align_ptr(diag204_buf_vmalloc); - diag204_buf_pages = pages; - return diag204_buf; -} - -static void *diag204_alloc_rbuf(void) -{ - diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0); - if (!diag204_buf) - return ERR_PTR(-ENOMEM); - diag204_buf_pages = 1; - return diag204_buf; -} - -static void *diag204_get_buffer(enum diag204_format fmt, int *pages) -{ - if (diag204_buf) { - *pages = diag204_buf_pages; - return diag204_buf; - } - if (fmt == INFO_SIMPLE) { - *pages = 1; - return diag204_alloc_rbuf(); - } else {/* INFO_EXT */ - *pages = diag204((unsigned long)SUBC_RSI | - (unsigned long)INFO_EXT, 0, NULL); - if (*pages <= 0) - return ERR_PTR(-ENOSYS); - else - return diag204_alloc_vbuf(*pages); - } -} - -/* - * diag204_probe() has to find out, which type of diagnose 204 implementation - * we have on our machine. Currently there are three possible scanarios: - * - subcode 4 + simple data format (only one page) - * - subcode 4-6 + extended data format - * - subcode 4-7 + extended data format - * - * Subcode 5 is used to retrieve the size of the data, provided by subcodes - * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition - * to subcode 6 it provides also information about secondary cpus. - * In order to get as much information as possible, we first try - * subcode 7, then 6 and if both fail, we use subcode 4. - */ - -static int diag204_probe(void) -{ - void *buf; - int pages, rc; - - buf = diag204_get_buffer(INFO_EXT, &pages); - if (!IS_ERR(buf)) { - if (diag204((unsigned long)SUBC_STIB7 | - (unsigned long)INFO_EXT, pages, buf) >= 0) { - diag204_store_sc = SUBC_STIB7; - diag204_info_type = INFO_EXT; - goto out; - } - if (diag204((unsigned long)SUBC_STIB6 | - (unsigned long)INFO_EXT, pages, buf) >= 0) { - diag204_store_sc = SUBC_STIB6; - diag204_info_type = INFO_EXT; - goto out; - } - diag204_free_buffer(); - } - - /* subcodes 6 and 7 failed, now try subcode 4 */ - - buf = diag204_get_buffer(INFO_SIMPLE, &pages); - if (IS_ERR(buf)) { - rc = PTR_ERR(buf); - goto fail_alloc; - } - if (diag204((unsigned long)SUBC_STIB4 | - (unsigned long)INFO_SIMPLE, pages, buf) >= 0) { - diag204_store_sc = SUBC_STIB4; - diag204_info_type = INFO_SIMPLE; - goto out; - } else { - rc = -ENOSYS; - goto fail_store; - } -out: - rc = 0; -fail_store: - diag204_free_buffer(); -fail_alloc: - return rc; -} - -static int diag204_do_store(void *buf, int pages) -{ - int rc; - - rc = diag204((unsigned long) diag204_store_sc | - (unsigned long) diag204_info_type, pages, buf); - return rc < 0 ? -ENOSYS : 0; -} - -static void *diag204_store(void) -{ - void *buf; - int pages, rc; - - buf = diag204_get_buffer(diag204_info_type, &pages); - if (IS_ERR(buf)) - goto out; - rc = diag204_do_store(buf, pages); - if (rc) - return ERR_PTR(rc); -out: - return buf; -} - -/* Diagnose 224 functions */ - -static int diag224(void *ptr) -{ - int rc = -EOPNOTSUPP; - - asm volatile( - " diag %1,%2,0x224\n" - "0: lhi %0,0x0\n" - "1:\n" - EX_TABLE(0b,1b) - : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); - return rc; -} - -static int diag224_get_name_table(void) -{ - /* memory must be below 2GB */ - diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA); - if (!diag224_cpu_names) - return -ENOMEM; - if (diag224(diag224_cpu_names)) { - kfree(diag224_cpu_names); - return -EOPNOTSUPP; - } - EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16); - return 0; -} - -static void diag224_delete_name_table(void) -{ - kfree(diag224_cpu_names); -} - -static int diag224_idx2name(int index, char *name) -{ - memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN), - CPU_NAME_LEN); - name[CPU_NAME_LEN] = 0; - strim(name); - return 0; -} - -struct dbfs_d204_hdr { - u64 len; /* Length of d204 buffer without header */ - u16 version; /* Version of header */ - u8 sc; /* Used subcode */ - char reserved[53]; -} __attribute__ ((packed)); - -struct dbfs_d204 { - struct dbfs_d204_hdr hdr; /* 64 byte header */ - char buf[]; /* d204 buffer */ -} __attribute__ ((packed)); - -static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size) -{ - struct dbfs_d204 *d204; - int rc, buf_size; - void *base; - - buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr); - base = vzalloc(buf_size); - if (!base) - return -ENOMEM; - d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr); - rc = diag204_do_store(d204->buf, diag204_buf_pages); - if (rc) { - vfree(base); - return rc; - } - d204->hdr.version = DBFS_D204_HDR_VERSION; - d204->hdr.len = PAGE_SIZE * diag204_buf_pages; - d204->hdr.sc = diag204_store_sc; - *data = d204; - *data_free_ptr = base; - *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr); - return 0; -} - -static struct hypfs_dbfs_file dbfs_file_d204 = { - .name = "diag_204", - .data_create = dbfs_d204_create, - .data_free = vfree, -}; - -__init int hypfs_diag_init(void) -{ - int rc; - - if (diag204_probe()) { - pr_err("The hardware system does not support hypfs\n"); - return -ENODATA; - } - if (diag204_info_type == INFO_EXT) { - rc = hypfs_dbfs_create_file(&dbfs_file_d204); - if (rc) - return rc; - } - if (MACHINE_IS_LPAR) { - rc = diag224_get_name_table(); - if (rc) { - pr_err("The hardware system does not provide all " - "functions required by hypfs\n"); - debugfs_remove(dbfs_d204_file); - return rc; - } - } - return 0; -} - -void hypfs_diag_exit(void) -{ - debugfs_remove(dbfs_d204_file); - diag224_delete_name_table(); - diag204_free_buffer(); - hypfs_dbfs_remove_file(&dbfs_file_d204); -} - -/* - * Functions to create the directory structure - * ******************************************* - */ - -static int hypfs_create_cpu_files(struct super_block *sb, - struct dentry *cpus_dir, void *cpu_info) -{ - struct dentry *cpu_dir; - char buffer[TMP_SIZE]; - void *rc; - - snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type, - cpu_info)); - cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer); - rc = hypfs_create_u64(sb, cpu_dir, "mgmtime", - cpu_info__acc_time(diag204_info_type, cpu_info) - - cpu_info__lp_time(diag204_info_type, cpu_info)); - if (IS_ERR(rc)) - return PTR_ERR(rc); - rc = hypfs_create_u64(sb, cpu_dir, "cputime", - cpu_info__lp_time(diag204_info_type, cpu_info)); - if (IS_ERR(rc)) - return PTR_ERR(rc); - if (diag204_info_type == INFO_EXT) { - rc = hypfs_create_u64(sb, cpu_dir, "onlinetime", - cpu_info__online_time(diag204_info_type, - cpu_info)); - if (IS_ERR(rc)) - return PTR_ERR(rc); - } - diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer); - rc = hypfs_create_str(sb, cpu_dir, "type", buffer); - if (IS_ERR(rc)) - return PTR_ERR(rc); - return 0; -} - -static void *hypfs_create_lpar_files(struct super_block *sb, - struct dentry *systems_dir, void *part_hdr) -{ - struct dentry *cpus_dir; - struct dentry *lpar_dir; - char lpar_name[LPAR_NAME_LEN + 1]; - void *cpu_info; - int i; - - part_hdr__part_name(diag204_info_type, part_hdr, lpar_name); - lpar_name[LPAR_NAME_LEN] = 0; - lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name); - if (IS_ERR(lpar_dir)) - return lpar_dir; - cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus"); - if (IS_ERR(cpus_dir)) - return cpus_dir; - cpu_info = part_hdr + part_hdr__size(diag204_info_type); - for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) { - int rc; - rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info); - if (rc) - return ERR_PTR(rc); - cpu_info += cpu_info__size(diag204_info_type); - } - return cpu_info; -} - -static int hypfs_create_phys_cpu_files(struct super_block *sb, - struct dentry *cpus_dir, void *cpu_info) -{ - struct dentry *cpu_dir; - char buffer[TMP_SIZE]; - void *rc; - - snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type, - cpu_info)); - cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer); - if (IS_ERR(cpu_dir)) - return PTR_ERR(cpu_dir); - rc = hypfs_create_u64(sb, cpu_dir, "mgmtime", - phys_cpu__mgm_time(diag204_info_type, cpu_info)); - if (IS_ERR(rc)) - return PTR_ERR(rc); - diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer); - rc = hypfs_create_str(sb, cpu_dir, "type", buffer); - if (IS_ERR(rc)) - return PTR_ERR(rc); - return 0; -} - -static void *hypfs_create_phys_files(struct super_block *sb, - struct dentry *parent_dir, void *phys_hdr) -{ - int i; - void *cpu_info; - struct dentry *cpus_dir; - - cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus"); - if (IS_ERR(cpus_dir)) - return cpus_dir; - cpu_info = phys_hdr + phys_hdr__size(diag204_info_type); - for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) { - int rc; - rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info); - if (rc) - return ERR_PTR(rc); - cpu_info += phys_cpu__size(diag204_info_type); - } - return cpu_info; -} - -int hypfs_diag_create_files(struct super_block *sb, struct dentry *root) -{ - struct dentry *systems_dir, *hyp_dir; - void *time_hdr, *part_hdr; - int i, rc; - void *buffer, *ptr; - - buffer = diag204_store(); - if (IS_ERR(buffer)) - return PTR_ERR(buffer); - - systems_dir = hypfs_mkdir(sb, root, "systems"); - if (IS_ERR(systems_dir)) { - rc = PTR_ERR(systems_dir); - goto err_out; - } - time_hdr = (struct x_info_blk_hdr *)buffer; - part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type); - for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) { - part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr); - if (IS_ERR(part_hdr)) { - rc = PTR_ERR(part_hdr); - goto err_out; - } - } - if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) { - ptr = hypfs_create_phys_files(sb, root, part_hdr); - if (IS_ERR(ptr)) { - rc = PTR_ERR(ptr); - goto err_out; - } - } - hyp_dir = hypfs_mkdir(sb, root, "hyp"); - if (IS_ERR(hyp_dir)) { - rc = PTR_ERR(hyp_dir); - goto err_out; - } - ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor"); - if (IS_ERR(ptr)) { - rc = PTR_ERR(ptr); - goto err_out; - } - rc = 0; - -err_out: - return rc; -} |