linux-kernel - [tip: perf/core] perf/x86/uncore: clean up const mismatch

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Message-ID: <176820499824.510.16331640362946890724.tip-bot2@tip-bot2>
Date: Mon, 12 Jan 2026 08:03:18 -0000
From: "tip-bot2 for Greg Kroah-Hartman" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf/x86/uncore: clean up const mismatch

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     632d89b030f1dac8d91875cd56a08adededba349
Gitweb:        https://git.kernel.org/tip/632d89b030f1dac8d91875cd56a08adededba349
Author:        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
AuthorDate:    Wed, 17 Dec 2025 13:42:41 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 06 Jan 2026 16:34:23 +01:00

perf/x86/uncore: clean up const mismatch

In some cmp functions, a const pointer is cast out to a non-const
pointer by using container_of() which is not correct.  Fix this up by
properly marking the pointers as const, which preserves the correct
type of the pointer passed into the functions.

Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://patch.msgid.link/2025121741-headstand-stratus-f5eb@gregkh
---
 arch/x86/events/intel/uncore_discovery.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/intel/uncore_discovery.c b/arch/x86/events/intel/uncore_discovery.c
index 7d57ce7..330bca2 100644
--- a/arch/x86/events/intel/uncore_discovery.c
+++ b/arch/x86/events/intel/uncore_discovery.c
@@ -52,7 +52,7 @@ static int get_device_die_id(struct pci_dev *dev)
 
 static inline int __type_cmp(const void *key, const struct rb_node *b)
 {
-	struct intel_uncore_discovery_type *type_b = __node_2_type(b);
+	const struct intel_uncore_discovery_type *type_b = __node_2_type(b);
 	const u16 *type_id = key;
 
 	if (type_b->type > *type_id)
@@ -115,7 +115,7 @@ get_uncore_discovery_type(struct uncore_unit_discovery *unit)
 
 static inline int pmu_idx_cmp(const void *key, const struct rb_node *b)
 {
-	struct intel_uncore_discovery_unit *unit;
+	const struct intel_uncore_discovery_unit *unit;
 	const unsigned int *id = key;
 
 	unit = rb_entry(b, struct intel_uncore_discovery_unit, node);
@@ -173,7 +173,7 @@ int intel_uncore_find_discovery_unit_id(struct rb_root *units, int die,
 
 static inline bool unit_less(struct rb_node *a, const struct rb_node *b)
 {
-	struct intel_uncore_discovery_unit *a_node, *b_node;
+	const struct intel_uncore_discovery_unit *a_node, *b_node;
 
 	a_node = rb_entry(a, struct intel_uncore_discovery_unit, node);
 	b_node = rb_entry(b, struct intel_uncore_discovery_unit, node);