#ifndef _GNU_SOURCE # define _GNU_SOURCE #endif #include #include #include #include #include #include #include "fs.h" #include "tracing_path.h" char tracing_mnt[PATH_MAX] = "/sys/kernel/debug"; char tracing_path[PATH_MAX] = "/sys/kernel/debug/tracing"; char tracing_events_path[PATH_MAX] = "/sys/kernel/debug/tracing/events"; static void __tracing_path_set(const char *tracing, const char *mountpoint) { snprintf(tracing_mnt, sizeof(tracing_mnt), "%s", mountpoint); snprintf(tracing_path, sizeof(tracing_path), "%s/%s", mountpoint, tracing); snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s", mountpoint, tracing, "events"); } static const char *tracing_path_tracefs_mount(void) { const char *mnt; mnt = tracefs__mount(); if (!mnt) return NULL; __tracing_path_set("", mnt); return mnt; } static const char *tracing_path_debugfs_mount(void) { const char *mnt; mnt = debugfs__mount(); if (!mnt) return NULL; __tracing_path_set("tracing/", mnt); return mnt; } const char *tracing_path_mount(void) { const char *mnt; mnt = tracing_path_tracefs_mount(); if (mnt) return mnt; mnt = tracing_path_debugfs_mount(); return mnt; } void tracing_path_set(const char *mntpt) { __tracing_path_set("tracing/", mntpt); } char *get_tracing_file(const char *name) { char *file; if (asprintf(&file, "%s/%s", tracing_path, name) < 0) return NULL; return file; } void put_tracing_file(char *file) { free(file); } static int strerror_open(int err, char *buf, size_t size, const char *filename) { char sbuf[128]; switch (err) { case ENOENT: /* * We will get here if we can't find the tracepoint, but one of * debugfs or tracefs is configured, which means you probably * want some tracepoint which wasn't compiled in your kernel. * - jirka */ if (debugfs__configured() || tracefs__configured()) { snprintf(buf, size, "Error:\tFile %s/%s not found.\n" "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n", tracing_events_path, filename); break; } snprintf(buf, size, "%s", "Error:\tUnable to find debugfs/tracefs\n" "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n" "Hint:\tIs the debugfs/tracefs filesystem mounted?\n" "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'"); break; case EACCES: { snprintf(buf, size, "Error:\tNo permissions to read %s/%s\n" "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n", tracing_events_path, filename, tracing_mnt); } break; default: snprintf(buf, size, "%s", str_error_r(err, sbuf, sizeof(sbuf))); break; } return 0; } int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name) { char path[PATH_MAX]; snprintf(path, PATH_MAX, "%s/%s", sys, name ?: "*"); return strerror_open(err, buf, size, path); } private-remove&id=3277953de2f31dd03c6375e9a9f680ac37fc9d27'>root/tools/arch/ia64/include
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authorzhong jiang <zhongjiang@huawei.com>2017-01-24 15:18:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 16:26:14 -0800
commit3277953de2f31dd03c6375e9a9f680ac37fc9d27 (patch)
tree6ba22924faa1b82ef2f0277db10a3f5abdc44157 /tools/arch/ia64/include
parent3705ccfdd1e8b539225ce20e3925a945cc788d67 (diff)
mm: do not export ioremap_page_range symbol for external module
Recently, I've found cases in which ioremap_page_range was used incorrectly, in external modules, leading to crashes. This can be partly attributed to the fact that ioremap_page_range is lower-level, with fewer protections, as compared to the other functions that an external module would typically call. Those include: ioremap_cache ioremap_nocache ioremap_prot ioremap_uc ioremap_wc ioremap_wt ...each of which wraps __ioremap_caller, which in turn provides a safer way to achieve the mapping. Therefore, stop EXPORT-ing ioremap_page_range. Link: http://lkml.kernel.org/r/1485173220-29010-1-git-send-email-zhongjiang@huawei.com Signed-off-by: zhong jiang <zhongjiang@huawei.com> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Suggested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/arch/ia64/include')