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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
59aa56bf2a
Code that uses no modular facilities whatsoever should not be sourcing module.h at all, since that header drags in a bunch of other headers with it. Similarly, code that is not explicitly using modular facilities like module_init() but only is declaring module_param setup variables should be using moduleparam.h and not the larger module.h file for that. In making this change, we also uncover an implicit use of BUG() in inline fcns within arch/arm/include/asm/xen/hypercall.h so we explicitly source <linux/bug.h> for that file now. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <xen/interface/platform.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen-ops.h>
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#include "xenfs.h"
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#define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */
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struct xensyms {
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struct xen_platform_op op;
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char *name;
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uint32_t namelen;
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};
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/* Grab next output page from the hypervisor */
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static int xensyms_next_sym(struct xensyms *xs)
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{
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int ret;
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struct xenpf_symdata *symdata = &xs->op.u.symdata;
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uint64_t symnum;
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memset(xs->name, 0, xs->namelen);
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symdata->namelen = xs->namelen;
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symnum = symdata->symnum;
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ret = HYPERVISOR_platform_op(&xs->op);
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if (ret < 0)
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return ret;
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/*
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* If hypervisor's symbol didn't fit into the buffer then allocate
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* a larger buffer and try again.
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*/
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if (unlikely(symdata->namelen > xs->namelen)) {
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kfree(xs->name);
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xs->namelen = symdata->namelen;
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xs->name = kzalloc(xs->namelen, GFP_KERNEL);
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if (!xs->name)
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return -ENOMEM;
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set_xen_guest_handle(symdata->name, xs->name);
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symdata->symnum--; /* Rewind */
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ret = HYPERVISOR_platform_op(&xs->op);
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if (ret < 0)
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return ret;
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}
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if (symdata->symnum == symnum)
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/* End of symbols */
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return 1;
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return 0;
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}
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static void *xensyms_start(struct seq_file *m, loff_t *pos)
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{
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struct xensyms *xs = (struct xensyms *)m->private;
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xs->op.u.symdata.symnum = *pos;
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if (xensyms_next_sym(xs))
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return NULL;
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return m->private;
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}
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static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos)
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{
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struct xensyms *xs = (struct xensyms *)m->private;
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xs->op.u.symdata.symnum = ++(*pos);
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if (xensyms_next_sym(xs))
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return NULL;
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return p;
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}
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static int xensyms_show(struct seq_file *m, void *p)
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{
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struct xensyms *xs = (struct xensyms *)m->private;
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struct xenpf_symdata *symdata = &xs->op.u.symdata;
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seq_printf(m, "%016llx %c %s\n", symdata->address,
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symdata->type, xs->name);
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return 0;
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}
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static void xensyms_stop(struct seq_file *m, void *p)
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{
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}
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static const struct seq_operations xensyms_seq_ops = {
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.start = xensyms_start,
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.next = xensyms_next,
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.show = xensyms_show,
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.stop = xensyms_stop,
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};
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static int xensyms_open(struct inode *inode, struct file *file)
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{
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struct seq_file *m;
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struct xensyms *xs;
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int ret;
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ret = seq_open_private(file, &xensyms_seq_ops,
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sizeof(struct xensyms));
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if (ret)
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return ret;
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m = file->private_data;
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xs = (struct xensyms *)m->private;
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xs->namelen = XEN_KSYM_NAME_LEN + 1;
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xs->name = kzalloc(xs->namelen, GFP_KERNEL);
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if (!xs->name) {
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seq_release_private(inode, file);
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return -ENOMEM;
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}
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set_xen_guest_handle(xs->op.u.symdata.name, xs->name);
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xs->op.cmd = XENPF_get_symbol;
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xs->op.u.symdata.namelen = xs->namelen;
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return 0;
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}
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static int xensyms_release(struct inode *inode, struct file *file)
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{
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struct seq_file *m = file->private_data;
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struct xensyms *xs = (struct xensyms *)m->private;
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kfree(xs->name);
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return seq_release_private(inode, file);
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}
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const struct file_operations xensyms_ops = {
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.open = xensyms_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = xensyms_release
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};
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