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| author |   Takashi Iwai <tiwai@suse.de> | 2020-09-09 18:26:07 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-09-09 18:26:48 +0200 |
| commit | 9ddb236f13594b34a12dacf69a5adca7a1aef35e (patch) | |
| tree | 1dc1f6e54962a2e3ad3d56c894522cb4b1ddce93 /kernel/events/callchain.c | |
| parent | ALSA: vx: vx_pcm: remove redundant assignment (diff) | |
| parent | ALSA: hda/realtek - The Mic on a RedmiBook doesn't work (diff) | |
| download | linux-dev-9ddb236f13594b34a12dacf69a5adca7a1aef35e.tar.xz linux-dev-9ddb236f13594b34a12dacf69a5adca7a1aef35e.zip | |
Merge branch 'for-linus' into for-next
Back-merge to apply the tasklet conversion patches that are based
on the already applied tasklet API changes on 5.9-rc4.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'kernel/events/callchain.c')
| -rw-r--r-- | kernel/events/callchain.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c index 334d48b16c36..58cbe357fb2b 100644 --- a/kernel/events/callchain.c +++ b/kernel/events/callchain.c @@ -149,7 +149,7 @@ void put_callchain_buffers(void) } } -static struct perf_callchain_entry *get_callchain_entry(int *rctx) +struct perf_callchain_entry *get_callchain_entry(int *rctx) { int cpu; struct callchain_cpus_entries *entries; @@ -159,8 +159,10 @@ static struct perf_callchain_entry *get_callchain_entry(int *rctx) return NULL; entries = rcu_dereference(callchain_cpus_entries); - if (!entries) + if (!entries) { + put_recursion_context(this_cpu_ptr(callchain_recursion), *rctx); return NULL; + } cpu = smp_processor_id(); @@ -168,7 +170,7 @@ static struct perf_callchain_entry *get_callchain_entry(int *rctx) (*rctx * perf_callchain_entry__sizeof())); } -static void +void put_callchain_entry(int rctx) { put_recursion_context(this_cpu_ptr(callchain_recursion), rctx); @@ -183,11 +185,8 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, int rctx; entry = get_callchain_entry(&rctx); - if (rctx == -1) - return NULL; - if (!entry) - goto exit_put; + return NULL; ctx.entry = entry; ctx.max_stack = max_stack; @@ -218,10 +217,9 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, if (add_mark) perf_callchain_store_context(&ctx, PERF_CONTEXT_USER); - fs = get_fs(); - set_fs(USER_DS); + fs = force_uaccess_begin(); perf_callchain_user(&ctx, regs); - set_fs(fs); + force_uaccess_end(fs); } } |