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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
Merge branch 'add-noinline_for_tracing-and-apply-it-to-tcp_drop_reason'
Yafang Shao says:
====================
Add noinline_for_tracing and apply it to tcp_drop_reason
This patchset introduces a new compiler annotation, noinline_for_tracing,
designed to prevent specific functions from being inlined to facilitate
tracing. In Patch #2, this annotation is applied to the tcp_drop_reason().
====================
Link: https://patch.msgid.link/20241024093742.87681-1-laoar.shao@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+8
-2
+6
include/linux/compiler_types.h
+6
include/linux/compiler_types.h
···
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#define noinline_for_stack noinline
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/*
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+
* Use noinline_for_tracing for functions that should not be inlined.
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+
* For tracing reasons.
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*/
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+
#define noinline_for_tracing noinline
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+
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/*
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* Sanitizer helper attributes: Because using __always_inline and
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* __no_sanitize_* conflict, provide helper attributes that will either expand
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* to __no_sanitize_* in compilation units where instrumentation is enabled
+2
-2
net/ipv4/tcp_input.c
+2
-2
net/ipv4/tcp_input.c
···
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return res;
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}
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-
static void tcp_drop_reason(struct sock *sk, struct sk_buff *skb,
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-
enum skb_drop_reason reason)
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+
noinline_for_tracing static void
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+
tcp_drop_reason(struct sock *sk, struct sk_buff *skb, enum skb_drop_reason reason)
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{
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sk_drops_add(sk, skb);
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sk_skb_reason_drop(sk, skb, reason);