/* * System call table mapper * * (C) 2016 Arnaldo Carvalho de Melo * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. */ #include "syscalltbl.h" #include #ifdef HAVE_SYSCALL_TABLE #include #include #include "util.h" #if defined(__x86_64__) #include const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID; static const char **syscalltbl_native = syscalltbl_x86_64; #endif struct syscall { int id; const char *name; }; static int syscallcmpname(const void *vkey, const void *ventry) { const char *key = vkey; const struct syscall *entry = ventry; return strcmp(key, entry->name); } static int syscallcmp(const void *va, const void *vb) { const struct syscall *a = va, *b = vb; return strcmp(a->name, b->name); } static int syscalltbl__init_native(struct syscalltbl *tbl) { int nr_entries = 0, i, j; struct syscall *entries; for (i = 0; i <= syscalltbl_native_max_id; ++i) if (syscalltbl_native[i]) ++nr_entries; entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries); if (tbl->syscalls.entries == NULL) return -1; for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) { if (syscalltbl_native[i]) { entries[j].name = syscalltbl_native[i]; entries[j].id = i; ++j; } } qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp); tbl->syscalls.nr_entries = nr_entries; return 0; } struct syscalltbl *syscalltbl__new(void) { struct syscalltbl *tbl = malloc(sizeof(*tbl)); if (tbl) { if (syscalltbl__init_native(tbl)) { free(tbl); return NULL; } } return tbl; } void syscalltbl__delete(struct syscalltbl *tbl) { zfree(&tbl->syscalls.entries); free(tbl); } const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) { return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; } int syscalltbl__id(struct syscalltbl *tbl, const char *name) { struct syscall *sc = bsearch(name, tbl->syscalls.entries, tbl->syscalls.nr_entries, sizeof(*sc), syscallcmpname); return sc ? sc->id : -1; } #else /* HAVE_SYSCALL_TABLE */ #include struct syscalltbl *syscalltbl__new(void) { struct syscalltbl *tbl = malloc(sizeof(*tbl)); if (tbl) tbl->audit_machine = audit_detect_machine(); return tbl; } void syscalltbl__delete(struct syscalltbl *tbl) { free(tbl); } const char *syscalltbl__name(const struct syscalltbl *tbl, int id) { return audit_syscall_to_name(id, tbl->audit_machine); } int syscalltbl__id(struct syscalltbl *tbl, const char *name) { return audit_name_to_syscall(name, tbl->audit_machine); } #endif /* HAVE_SYSCALL_TABLE */ 8adf5c48c421a4ca76468'>host/ohci-hub.c
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 23:58:38 +0100
committerIngo Molnar <mingo@kernel.org>2017-02-01 08:37:27 +0100
commitdd86e373e09fb16b83e8adf5c48c421a4ca76468 (patch)
tree55703c2ea8584e303e342090614e0aab3509ab21 /drivers/usb/host/ohci-hub.c
parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/usb/host/ohci-hub.c')