diff mbox series

[bpf-next] bpf: Remove unnecessary err < 0 check in bpf_struct_ops_map_update_elem

Message ID 20240315192112.2825039-1-martin.lau@linux.dev (mailing list archive)
State Accepted
Commit 7f3edd0c72c3f7214f8f28495f2e6466348eb128
Delegated to: BPF
Headers show
Series [bpf-next] bpf: Remove unnecessary err < 0 check in bpf_struct_ops_map_update_elem | expand

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netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 942 this patch: 942
netdev/build_tools success No tools touched, skip
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netdev/build_clang success Errors and warnings before: 957 this patch: 957
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 8 lines checked
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Commit Message

Martin KaFai Lau March 15, 2024, 7:21 p.m. UTC 
From: Martin KaFai Lau <martin.lau@kernel.org>

There is a "if (err)" check earlier, so the "if (err < 0)"
check that this patch removing is unnecessary. It was my overlook
when making adjustments to the bpf_struct_ops_prepare_trampoline()
such that the caller does not have to worry about the new page when
the function returns error.

Cc: Kui-Feng Lee <thinker.li@gmail.com>
Fixes: 187e2af05abe ("bpf: struct_ops supports more than one page for trampolines.")
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
---
 kernel/bpf/bpf_struct_ops.c | 2 --
 1 file changed, 2 deletions(-)

Comments

Stanislav Fomichev March 15, 2024, 8:32 p.m. UTC | #1 
On 03/15, Martin KaFai Lau wrote:
> From: Martin KaFai Lau <martin.lau@kernel.org>
> 
> There is a "if (err)" check earlier, so the "if (err < 0)"
> check that this patch removing is unnecessary. It was my overlook
> when making adjustments to the bpf_struct_ops_prepare_trampoline()
> such that the caller does not have to worry about the new page when
> the function returns error.
> 
> Cc: Kui-Feng Lee <thinker.li@gmail.com>
> Fixes: 187e2af05abe ("bpf: struct_ops supports more than one page for trampolines.")
> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

Acked-by: Stanislav Fomichev <sdf@google.com>
patchwork-bot+netdevbpf@kernel.org March 18, 2024, 7:50 p.m. UTC | #2 
Hello:

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

On Fri, 15 Mar 2024 12:21:12 -0700 you wrote:
> From: Martin KaFai Lau <martin.lau@kernel.org>
> 
> There is a "if (err)" check earlier, so the "if (err < 0)"
> check that this patch removing is unnecessary. It was my overlook
> when making adjustments to the bpf_struct_ops_prepare_trampoline()
> such that the caller does not have to worry about the new page when
> the function returns error.
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: Remove unnecessary err < 0 check in bpf_struct_ops_map_update_elem
    https://git.kernel.org/bpf/bpf-next/c/7f3edd0c72c3

You are awesome, thank you!
diff mbox series

Patch

diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index 43356faaa057..3fcd35314ce5 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -728,8 +728,6 @@  static long bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
 			cur_image = image;
 			trampoline_start = 0;
 		}
-		if (err < 0)
-			goto reset_unlock;
 
 		*(void **)(kdata + moff) = image + trampoline_start + cfi_get_offset();