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authorLinus Torvalds <torvalds@linux-foundation.org>2022-01-20 11:41:01 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-20 11:41:01 +0300
commitf4484d138b31e8fa1ba410363b5b9664f68974af (patch)
tree6d776b1212604d3b16df499ae6e455e4a20544db /kernel/kthread.c
parent1d1df41c5a33359a00e919d54eaebfb789711fdc (diff)
parentb1e78ef3be2533973953a35a56739fda7325875c (diff)
downloadlinux-f4484d138b31e8fa1ba410363b5b9664f68974af.tar.xz
Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton: "55 patches. Subsystems affected by this patch series: percpu, procfs, sysctl, misc, core-kernel, get_maintainer, lib, checkpatch, binfmt, nilfs2, hfs, fat, adfs, panic, delayacct, kconfig, kcov, and ubsan" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (55 commits) lib: remove redundant assignment to variable ret ubsan: remove CONFIG_UBSAN_OBJECT_SIZE kcov: fix generic Kconfig dependencies if ARCH_WANTS_NO_INSTR lib/Kconfig.debug: make TEST_KMOD depend on PAGE_SIZE_LESS_THAN_256KB btrfs: use generic Kconfig option for 256kB page size limit arch/Kconfig: split PAGE_SIZE_LESS_THAN_256KB from PAGE_SIZE_LESS_THAN_64KB configs: introduce debug.config for CI-like setup delayacct: track delays from memory compact Documentation/accounting/delay-accounting.rst: add thrashing page cache and direct compact delayacct: cleanup flags in struct task_delay_info and functions use it delayacct: fix incomplete disable operation when switch enable to disable delayacct: support swapin delay accounting for swapping without blkio panic: remove oops_id panic: use error_report_end tracepoint on warnings fs/adfs: remove unneeded variable make code cleaner FAT: use io_schedule_timeout() instead of congestion_wait() hfsplus: use struct_group_attr() for memcpy() region nilfs2: remove redundant pointer sbufs fs/binfmt_elf: use PT_LOAD p_align values for static PIE const_structs.checkpatch: add frequently used ops structs ...
Diffstat (limited to 'kernel/kthread.c')
-rw-r--r--kernel/kthread.c32
1 files changed, 30 insertions, 2 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index a2c156ee8275..38c6dd822da8 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -61,6 +61,8 @@ struct kthread {
#ifdef CONFIG_BLK_CGROUP
struct cgroup_subsys_state *blkcg_css;
#endif
+ /* To store the full name if task comm is truncated. */
+ char *full_name;
};
enum KTHREAD_BITS {
@@ -94,6 +96,18 @@ static inline struct kthread *__to_kthread(struct task_struct *p)
return kthread;
}
+void get_kthread_comm(char *buf, size_t buf_size, struct task_struct *tsk)
+{
+ struct kthread *kthread = to_kthread(tsk);
+
+ if (!kthread || !kthread->full_name) {
+ __get_task_comm(buf, buf_size, tsk);
+ return;
+ }
+
+ strscpy_pad(buf, kthread->full_name, buf_size);
+}
+
bool set_kthread_struct(struct task_struct *p)
{
struct kthread *kthread;
@@ -121,10 +135,14 @@ void free_kthread_struct(struct task_struct *k)
* Can be NULL if kmalloc() in set_kthread_struct() failed.
*/
kthread = to_kthread(k);
+ if (!kthread)
+ return;
+
#ifdef CONFIG_BLK_CGROUP
- WARN_ON_ONCE(kthread && kthread->blkcg_css);
+ WARN_ON_ONCE(kthread->blkcg_css);
#endif
k->worker_private = NULL;
+ kfree(kthread->full_name);
kfree(kthread);
}
@@ -438,12 +456,22 @@ struct task_struct *__kthread_create_on_node(int (*threadfn)(void *data),
task = create->result;
if (!IS_ERR(task)) {
char name[TASK_COMM_LEN];
+ va_list aq;
+ int len;
/*
* task is already visible to other tasks, so updating
* COMM must be protected.
*/
- vsnprintf(name, sizeof(name), namefmt, args);
+ va_copy(aq, args);
+ len = vsnprintf(name, sizeof(name), namefmt, aq);
+ va_end(aq);
+ if (len >= TASK_COMM_LEN) {
+ struct kthread *kthread = to_kthread(task);
+
+ /* leave it truncated when out of memory. */
+ kthread->full_name = kvasprintf(GFP_KERNEL, namefmt, args);
+ }
set_task_comm(task, name);
}
kfree(create);