[PATCH -next] bpf: remove unused function

[PATCH -next] bpf: remove unused function

[Yang Li]

The function are defined in the verifier.c file, but not called
elsewhere, so delete the unused function.

kernel/bpf/verifier.c:3448:20: warning: unused function 'bt_set_slot'
kernel/bpf/verifier.c:3453:20: warning: unused function 'bt_clear_slot'
kernel/bpf/verifier.c:3488:20: warning: unused function 'bt_is_slot_set'

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7714
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
---
 kernel/bpf/verifier.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 727a59e4a647..49292f37c0de 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -3445,16 +3445,6 @@ static inline void bt_clear_frame_slot(struct backtrack_state *bt, u32 frame, u3
 	bt->stack_masks[frame] &= ~(1ull << slot);
 }
 
-static inline void bt_set_slot(struct backtrack_state *bt, u32 slot)
-{
-	bt_set_frame_slot(bt, bt->frame, slot);
-}
-
-static inline void bt_clear_slot(struct backtrack_state *bt, u32 slot)
-{
-	bt_clear_frame_slot(bt, bt->frame, slot);
-}
-
 static inline u32 bt_frame_reg_mask(struct backtrack_state *bt, u32 frame)
 {
 	return bt->reg_masks[frame];
@@ -3485,11 +3475,6 @@ static inline bool bt_is_frame_slot_set(struct backtrack_state *bt, u32 frame, u
 	return bt->stack_masks[frame] & (1ull << slot);
 }
 
-static inline bool bt_is_slot_set(struct backtrack_state *bt, u32 slot)
-{
-	return bt_is_frame_slot_set(bt, bt->frame, slot);
-}
-
 /* format registers bitmask, e.g., "r0,r2,r4" for 0x15 mask */
 static void fmt_reg_mask(char *buf, ssize_t buf_sz, u32 reg_mask)
 {
-- 
2.20.1.7.g153144c

Re: [PATCH -next] bpf: remove unused function

[Eduard Zingerman]

On Tue, 2023-12-12 at 08:54 +0800, Yang Li wrote:
> The function are defined in the verifier.c file, but not called
> elsewhere, so delete the unused function.
> 
> kernel/bpf/verifier.c:3448:20: warning: unused function 'bt_set_slot'
> kernel/bpf/verifier.c:3453:20: warning: unused function 'bt_clear_slot'
> kernel/bpf/verifier.c:3488:20: warning: unused function 'bt_is_slot_set'
> 
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7714
> Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>

These are unused indeed.
Looks like calls to these functions were removed in commit:
41f6f64e6999 ("bpf: support non-r10 register spill/fill to/from stack in precision tracking")

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

Re: [PATCH -next] bpf: remove unused function

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Tue, 12 Dec 2023 08:54:36 +0800 you wrote:
> The function are defined in the verifier.c file, but not called
> elsewhere, so delete the unused function.
> 
> kernel/bpf/verifier.c:3448:20: warning: unused function 'bt_set_slot'
> kernel/bpf/verifier.c:3453:20: warning: unused function 'bt_clear_slot'
> kernel/bpf/verifier.c:3488:20: warning: unused function 'bt_is_slot_set'
> 
> [...]

Here is the summary with links:
  - [-next] bpf: remove unused function
    https://git.kernel.org/bpf/bpf-next/c/56c26d5ad86d

You are awesome, thank you!
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