lkml.org 
[lkml]   [2019]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: perf/urgent] perf/core: Consistently fail fork on allocation failures
The following commit has been merged into the perf/urgent branch of tip:

Commit-ID: 697d877849d4b34ab58d7078d6930bad0ef6fc66
Gitweb: https://git.kernel.org/tip/697d877849d4b34ab58d7078d6930bad0ef6fc66
Author: Alexander Shishkin <alexander.shishkin@linux.intel.com>
AuthorDate: Tue, 05 Nov 2019 09:57:02 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Wed, 13 Nov 2019 08:16:43 +01:00

perf/core: Consistently fail fork on allocation failures

Commit:

313ccb9615948 ("perf: Allocate context task_ctx_data for child event")

makes the inherit path skip over the current event in case of task_ctx_data
allocation failure. This, however, is inconsistent with allocation failures
in perf_event_alloc(), which would abort the fork.

Correct this by returning an error code on task_ctx_data allocation
failure and failing the fork in that case.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/20191105075702.60319-1-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 7655441..466e333 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11802,7 +11802,7 @@ inherit_event(struct perf_event *parent_event,
GFP_KERNEL);
if (!child_ctx->task_ctx_data) {
free_event(child_event);
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
}

\
 
 \ /
  Last update: 2019-11-13 11:07    [W:0.080 / U:2.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site