litmus-rt.git - The LITMUS^RT kernel.

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author	Steven Rostedt (Red Hat) <rostedt@goodmis.org>	2014-06-25 09:53:21 -0400
committer	Steven Rostedt <rostedt@goodmis.org>	2014-07-18 13:56:55 -0400
commit	6a8a5051130fd2e2b5f978a5a2e222fcc7d2dff4 (patch)
tree	694af71a206adecb973553105e73a3a0508cc83e /tools/perf/scripts/python/sctop.py
parent	e1dc5007cf51a0a5d2e6ca6d0c81d1c987b0ac77 (diff)

MIPS: ftrace: Add call to ftrace_graph_is_dead() in function graph code

ftrace_stop() is going away as it disables parts of function tracing that affects users that should not be affected. But ftrace_graph_stop() is built on ftrace_stop(). Here's another example of killing all of function tracing because something went wrong with function graph tracing. Instead of disabling all users of function tracing on function graph error, disable only function graph tracing. To do this, the arch code must call ftrace_graph_is_dead() before it implements function graph. Cc: Ralf Baechle <ralf@linux-mips.org> Tested-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Diffstat (limited to 'tools/perf/scripts/python/sctop.py')

0 files changed, 0 insertions, 0 deletions

/* NOMMU mmap support for RomFS on MTD devices * * Copyright © 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/mm.h> #include <linux/mtd/super.h> #include "internal.h" /* * try to determine where a shared mapping can be made * - only supported for NOMMU at the moment (MMU can't doesn't copy private * mappings) * - attempts to map through to the underlying MTD device */ static unsigned long romfs_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct inode *inode = file->f_mapping->host; struct mtd_info *mtd = inode->i_sb->s_mtd; unsigned long isize, offset, maxpages, lpages; if (!mtd) goto cant_map_directly; /* the mapping mustn't extend beyond the EOF */ lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; isize = i_size_read(inode); offset = pgoff << PAGE_SHIFT; maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT; if ((pgoff >= maxpages) || (maxpages - pgoff < lpages)) return (unsigned long) -EINVAL; /* we need to call down to the MTD layer to do the actual mapping */ if (mtd->get_unmapped_area) { if (addr != 0) return (unsigned long) -EINVAL; if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) return (unsigned long) -EINVAL; offset += ROMFS_I(inode)->i_dataoffset; if (offset > mtd->size - len) return (unsigned long) -EINVAL; return mtd->get_unmapped_area(mtd, len, offset, flags); } cant_map_directly: return (unsigned long) -ENOSYS; } /* * permit a R/O mapping to be made directly through onto an MTD device if * possible */ static int romfs_mmap(struct file *file, struct vm_area_struct *vma) { return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -ENOSYS; } const struct file_operations romfs_ro_fops = { .llseek = generic_file_llseek, .read = do_sync_read, .aio_read = generic_file_aio_read, .splice_read = generic_file_splice_read, .mmap = romfs_mmap, .get_unmapped_area = romfs_get_unmapped_area, };


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