diff options
| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2025-08-29 13:44:40 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-09-21 14:22:00 -0700 |
| commit | 1bca7359d72f759f2b119fc324c138372d3a2cc0 (patch) | |
| tree | 6748424a42091bc8911169ff14335a078f12020e | |
| parent | 4dfd4bba85785c88365b27af859ddb01c6fcf44a (diff) | |
fork: check charging success before zeroing stack
Patch series "mm: task_stack: Stack handling cleanups".
These are some small cleanups for the fork code that was split off from
Pasha:s dynamic stack patch series, they are generally nice on their own
so let's propose them for merging.
This patch (of 2):
No need to do zero cached stack if memcg charge fails, so move the
charging attempt before the memset operation.
Link: https://lkml.kernel.org/r/20250829-fork-cleanups-for-dynstack-v1-0-3bbaadce1f00@linaro.org
Link: https://lkml.kernel.org/r/20250829-fork-cleanups-for-dynstack-v1-1-3bbaadce1f00@linaro.org
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/20240311164638.2015063-6-pasha.tatashin@soleen.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Ben Segall <bsegall@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Mel Gorman <mgorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | kernel/fork.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 5115be549234..157612fd669a 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -290,6 +290,11 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node) if (!vm_area) continue; + if (memcg_charge_kernel_stack(vm_area)) { + vfree(vm_area->addr); + return -ENOMEM; + } + /* Reset stack metadata. */ kasan_unpoison_range(vm_area->addr, THREAD_SIZE); @@ -298,11 +303,6 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node) /* Clear stale pointers from reused stack. */ memset(stack, 0, THREAD_SIZE); - if (memcg_charge_kernel_stack(vm_area)) { - vfree(vm_area->addr); - return -ENOMEM; - } - tsk->stack_vm_area = vm_area; tsk->stack = stack; return 0; |