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s390/zcore: remove memmap device 

Remove unused /sys/kernel/debug/zcore/memmap device.
Since at least version 1.24.0 of s390-tools zfcpdump no longer
needs it and reads /proc/vmcore instead.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Alexander Egorenkov 2020-06-19 10:38:46 +02:00 committed by Heiko Carstens
parent 0188d08a46
commit b39e7724b0
1 changed files with 2 additions and 55 deletions
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57
drivers/s390/char/zcore.c
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@ -1,8 +1,7 @@
// SPDX-License-Identifier: GPL-1.0+
/*
* zcore module to export memory content and register sets for creating system
* dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same
* dump format as s390 standalone dumps.
* dumps on SCSI disks (zfcpdump).
*
* For more information please refer to Documentation/s390/zfcpdump.rst
*
@ -16,7 +15,6 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/memblock.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
@ -33,8 +31,6 @@
#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */
enum arch_id {
ARCH_S390 = 0,
ARCH_S390X = 1,
@ -48,7 +44,6 @@ struct ipib_info {
static struct debug_info *zcore_dbf;
static int hsa_available;
static struct dentry *zcore_dir;
static struct dentry *zcore_memmap_file;
static struct dentry *zcore_reipl_file;
static struct dentry *zcore_hsa_file;
static struct ipl_parameter_block *zcore_ipl_block;
@ -139,46 +134,6 @@ static void release_hsa(void)
hsa_available = 0;
}
static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
return simple_read_from_buffer(buf, count, ppos, filp->private_data,
memblock.memory.cnt * CHUNK_INFO_SIZE);
}
static int zcore_memmap_open(struct inode *inode, struct file *filp)
{
struct memblock_region *reg;
char *buf;
int i = 0;
buf = kcalloc(memblock.memory.cnt, CHUNK_INFO_SIZE, GFP_KERNEL);
if (!buf) {
return -ENOMEM;
}
for_each_memblock(memory, reg) {
sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ",
(unsigned long long) reg->base,
(unsigned long long) reg->size);
}
filp->private_data = buf;
return nonseekable_open(inode, filp);
}
static int zcore_memmap_release(struct inode *inode, struct file *filp)
{
kfree(filp->private_data);
return 0;
}
static const struct file_operations zcore_memmap_fops = {
.owner = THIS_MODULE,
.read = zcore_memmap_read,
.open = zcore_memmap_open,
.release = zcore_memmap_release,
.llseek = no_llseek,
};
static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -335,17 +290,11 @@ static int __init zcore_init(void)
rc = -ENOMEM;
goto fail;
}
zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
NULL, &zcore_memmap_fops);
if (!zcore_memmap_file) {
rc = -ENOMEM;
goto fail_dir;
}
zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
NULL, &zcore_reipl_fops);
if (!zcore_reipl_file) {
rc = -ENOMEM;
goto fail_memmap_file;
goto fail_dir;
}
zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
NULL, &zcore_hsa_fops);
@ -357,8 +306,6 @@ static int __init zcore_init(void)
fail_reipl_file:
debugfs_remove(zcore_reipl_file);
fail_memmap_file:
debugfs_remove(zcore_memmap_file);
fail_dir:
debugfs_remove(zcore_dir);
fail: