mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-21 02:49:11 +00:00
39f44be375
Commit bbea9f6966
removed the max_fdset
element of struct fdtable. It appears that checking max_fds is
sufficient now.
Signed-off-by: Paul Mackerras <paulus@samba.org>
238 lines
5.5 KiB
C
238 lines
5.5 KiB
C
/*
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* SPU core dump code
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*
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* (C) Copyright 2006 IBM Corp.
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*
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* Author: Dwayne Grant McConnell <decimal@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/elf.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/syscalls.h>
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#include <asm/uaccess.h>
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#include "spufs.h"
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struct spufs_ctx_info {
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struct list_head list;
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int dfd;
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int memsize; /* in bytes */
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struct spu_context *ctx;
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};
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static LIST_HEAD(ctx_info_list);
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static ssize_t do_coredump_read(int num, struct spu_context *ctx, void __user *buffer,
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size_t size, loff_t *off)
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{
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u64 data;
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int ret;
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if (spufs_coredump_read[num].read)
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return spufs_coredump_read[num].read(ctx, buffer, size, off);
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data = spufs_coredump_read[num].get(ctx);
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ret = copy_to_user(buffer, &data, 8);
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return ret ? -EFAULT : 8;
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}
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/*
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* These are the only things you should do on a core-file: use only these
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* functions to write out all the necessary info.
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*/
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static int spufs_dump_write(struct file *file, const void *addr, int nr)
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{
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return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
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}
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static int spufs_dump_seek(struct file *file, loff_t off)
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{
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if (file->f_op->llseek) {
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if (file->f_op->llseek(file, off, 0) != off)
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return 0;
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} else
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file->f_pos = off;
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return 1;
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}
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static void spufs_fill_memsize(struct spufs_ctx_info *ctx_info)
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{
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struct spu_context *ctx;
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unsigned long long lslr;
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ctx = ctx_info->ctx;
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lslr = ctx->csa.priv2.spu_lslr_RW;
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ctx_info->memsize = lslr + 1;
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}
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static int spufs_ctx_note_size(struct spufs_ctx_info *ctx_info)
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{
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int dfd, memsize, i, sz, total = 0;
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char *name;
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char fullname[80];
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dfd = ctx_info->dfd;
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memsize = ctx_info->memsize;
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for (i = 0; spufs_coredump_read[i].name; i++) {
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name = spufs_coredump_read[i].name;
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sz = spufs_coredump_read[i].size;
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sprintf(fullname, "SPU/%d/%s", dfd, name);
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total += sizeof(struct elf_note);
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total += roundup(strlen(fullname) + 1, 4);
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if (!strcmp(name, "mem"))
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total += roundup(memsize, 4);
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else
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total += roundup(sz, 4);
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}
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return total;
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}
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static int spufs_add_one_context(struct file *file, int dfd)
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{
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struct spu_context *ctx;
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struct spufs_ctx_info *ctx_info;
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int size;
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ctx = SPUFS_I(file->f_dentry->d_inode)->i_ctx;
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if (ctx->flags & SPU_CREATE_NOSCHED)
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return 0;
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ctx_info = kzalloc(sizeof(*ctx_info), GFP_KERNEL);
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if (unlikely(!ctx_info))
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return -ENOMEM;
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ctx_info->dfd = dfd;
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ctx_info->ctx = ctx;
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spufs_fill_memsize(ctx_info);
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size = spufs_ctx_note_size(ctx_info);
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list_add(&ctx_info->list, &ctx_info_list);
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return size;
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}
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/*
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* The additional architecture-specific notes for Cell are various
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* context files in the spu context.
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*
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* This function iterates over all open file descriptors and sees
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* if they are a directory in spufs. In that case we use spufs
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* internal functionality to dump them without needing to actually
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* open the files.
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*/
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static int spufs_arch_notes_size(void)
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{
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struct fdtable *fdt = files_fdtable(current->files);
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int size = 0, fd;
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for (fd = 0; fd < fdt->max_fds; fd++) {
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if (FD_ISSET(fd, fdt->open_fds)) {
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struct file *file = fcheck(fd);
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if (file && file->f_op == &spufs_context_fops) {
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int rval = spufs_add_one_context(file, fd);
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if (rval < 0)
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break;
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size += rval;
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}
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}
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}
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return size;
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}
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static void spufs_arch_write_note(struct spufs_ctx_info *ctx_info, int i,
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struct file *file)
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{
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struct spu_context *ctx;
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loff_t pos = 0;
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int sz, dfd, rc, total = 0;
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const int bufsz = 4096;
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char *name;
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char fullname[80], *buf;
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struct elf_note en;
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buf = kmalloc(bufsz, GFP_KERNEL);
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if (!buf)
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return;
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dfd = ctx_info->dfd;
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name = spufs_coredump_read[i].name;
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if (!strcmp(name, "mem"))
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sz = ctx_info->memsize;
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else
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sz = spufs_coredump_read[i].size;
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ctx = ctx_info->ctx;
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if (!ctx) {
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return;
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}
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sprintf(fullname, "SPU/%d/%s", dfd, name);
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en.n_namesz = strlen(fullname) + 1;
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en.n_descsz = sz;
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en.n_type = NT_SPU;
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if (!spufs_dump_write(file, &en, sizeof(en)))
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return;
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if (!spufs_dump_write(file, fullname, en.n_namesz))
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return;
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if (!spufs_dump_seek(file, roundup((unsigned long)file->f_pos, 4)))
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return;
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do {
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rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
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if (rc > 0) {
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if (!spufs_dump_write(file, buf, rc))
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return;
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total += rc;
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}
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} while (rc == bufsz && total < sz);
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spufs_dump_seek(file, roundup((unsigned long)file->f_pos
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- total + sz, 4));
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}
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static void spufs_arch_write_notes(struct file *file)
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{
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int j;
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struct spufs_ctx_info *ctx_info, *next;
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list_for_each_entry_safe(ctx_info, next, &ctx_info_list, list) {
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spu_acquire_saved(ctx_info->ctx);
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for (j = 0; j < spufs_coredump_num_notes; j++)
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spufs_arch_write_note(ctx_info, j, file);
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spu_release(ctx_info->ctx);
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list_del(&ctx_info->list);
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kfree(ctx_info);
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}
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}
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struct spu_coredump_calls spufs_coredump_calls = {
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.arch_notes_size = spufs_arch_notes_size,
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.arch_write_notes = spufs_arch_write_notes,
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.owner = THIS_MODULE,
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};
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