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selftests/bpf: Add get_preempt_count() support for LoongArch

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There is no LoongArch support for get_preempt_count() currently and its
fallback path always returns 0, just add it so that bpf_in_interrupt(),
bpf_in_nmi(), bpf_in_hardirq(), bpf_in_serving_softirq(), bpf_in_task()
work for LoongArch as well.

The latest kernels select CONFIG_THREAD_INFO_IN_TASK, it can just read
preempt_count from the thread_info which is embedded within task_struct.

With this patch, "./test_progs -t exe_ctx" passes on LoongArch.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tiezhu Yang 2026-06-25 13:08:57 +08:00 committed by Huacai Chen
parent eae0693d13
commit edc5cb8b2b
1 changed files with 7 additions and 0 deletions
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7
tools/testing/selftests/bpf/bpf_experimental.h
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@ -423,6 +423,8 @@ static inline int get_preempt_count(void)
return bpf_get_current_task_btf()->thread_info.preempt_count;
#elif defined(bpf_target_s390)
return bpf_get_lowcore()->preempt_count;
#elif defined(bpf_target_loongarch)
return bpf_get_current_task_btf()->thread_info.preempt_count;
#endif
return 0;
}
@ -433,6 +435,7 @@ static inline int get_preempt_count(void)
* * arm64
* * powerpc64
* * s390x
* * loongarch
*/
static inline int bpf_in_interrupt(void)
{
@ -454,6 +457,7 @@ static inline int bpf_in_interrupt(void)
* * arm64
* * powerpc64
* * s390x
* * loongarch
*/
static inline int bpf_in_nmi(void)
{
@ -466,6 +470,7 @@ static inline int bpf_in_nmi(void)
* * arm64
* * powerpc64
* * s390x
* * loongarch
*/
static inline int bpf_in_hardirq(void)
{
@ -478,6 +483,7 @@ static inline int bpf_in_hardirq(void)
* * arm64
* * powerpc64
* * s390x
* * loongarch
*/
static inline int bpf_in_serving_softirq(void)
{
@ -498,6 +504,7 @@ static inline int bpf_in_serving_softirq(void)
* * arm64
* * powerpc64
* * s390x
* * loongarch
*/
static inline int bpf_in_task(void)
{