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| author |   Heiko Carstens <hca@linux.ibm.com> | 2024-12-04 12:31:01 +0100 |
|---|---|---|
| committer |   Alexander Gordeev <agordeev@linux.ibm.com> | 2024-12-15 15:13:43 +0100 |
| commit | 5eee66c5bf6034c84a67fdbf224110f5288d9195 (patch) | |
| tree | 5f6569278f59dcbdf2c9d503168400c6c90bf164 | |
| parent | s390/preempt: Add comments (diff) | |
| download | wireguard-linux-5eee66c5bf6034c84a67fdbf224110f5288d9195.tar.xz wireguard-linux-5eee66c5bf6034c84a67fdbf224110f5288d9195.zip | |
s390/preempt: Remove special pre MARCH_HAS_Z196_FEATURES implementation
Remove the preempt count implementation for pre MARCH_HAS_Z196_FEATURES
builds. If the kernel is compiled with PREEMPT=n, which is the default for
all distributions, this has close to zero impact in the generated code.
Therefore remove the alternative implementation to keep things simple.
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
| -rw-r--r-- | arch/s390/include/asm/preempt.h | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/arch/s390/include/asm/preempt.h b/arch/s390/include/asm/preempt.h index 3e3f21385db9..e100dd32f766 100644 --- a/arch/s390/include/asm/preempt.h +++ b/arch/s390/include/asm/preempt.h @@ -8,8 +8,6 @@ #include <asm/cmpxchg.h> #include <asm/march.h> -#ifdef MARCH_HAS_Z196_FEATURES - /* We use the MSB mostly because its available */ #define PREEMPT_NEED_RESCHED 0x80000000 @@ -101,56 +99,6 @@ static __always_inline bool should_resched(int preempt_offset) preempt_offset); } -#else /* MARCH_HAS_Z196_FEATURES */ - -#define PREEMPT_ENABLED (0) - -static __always_inline int preempt_count(void) -{ - return READ_ONCE(get_lowcore()->preempt_count); -} - -static __always_inline void preempt_count_set(int pc) -{ - get_lowcore()->preempt_count = pc; -} - -static __always_inline void set_preempt_need_resched(void) -{ -} - -static __always_inline void clear_preempt_need_resched(void) -{ -} - -static __always_inline bool test_preempt_need_resched(void) -{ - return false; -} - -static __always_inline void __preempt_count_add(int val) -{ - get_lowcore()->preempt_count += val; -} - -static __always_inline void __preempt_count_sub(int val) -{ - get_lowcore()->preempt_count -= val; -} - -static __always_inline bool __preempt_count_dec_and_test(void) -{ - return !--get_lowcore()->preempt_count && tif_need_resched(); -} - -static __always_inline bool should_resched(int preempt_offset) -{ - return unlikely(preempt_count() == preempt_offset && - tif_need_resched()); -} - -#endif /* MARCH_HAS_Z196_FEATURES */ - #define init_task_preempt_count(p) do { } while (0) /* Deferred to CPU bringup time */ #define init_idle_preempt_count(p, cpu) do { } while (0) |