linux-kernel - [PATCH v1] perf build: Revert "enable -fno-strict-aliasing"

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Message-ID: <20250904174430.1414548-1-irogers@google.com>
Date: Thu,  4 Sep 2025 10:44:30 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH v1] perf build: Revert "enable -fno-strict-aliasing"

This reverts commit 55a18d2f3ff7 ("perf build: enable
-fno-strict-aliasing"). With (get|put)_unaligned_* using memcpy
-fno-strict-aliasing is no longer necessary as memcpys are assumed to
possibly alias.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
This patch needs:
https://lore.kernel.org/lkml/20250722215754.672330-1-irogers@google.com/
which have been merged into the tip timers/vdso branch.
---
 tools/perf/Makefile.config | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 5a5832ee7b53..306b8334b788 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -19,10 +19,6 @@ detected_var = $(shell echo "$(1)=$($(1))" >> $(OUTPUT).config-detected)
 CFLAGS := $(EXTRA_CFLAGS) $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
 HOSTCFLAGS := $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
 
-# This is required because the kernel is built with this and some of the code
-# borrowed from kernel headers depends on it, e.g. put_unaligned_*().
-CFLAGS += -fno-strict-aliasing
-
 # Enabled Wthread-safety analysis for clang builds.
 ifeq ($(CC_NO_CLANG), 0)
   CFLAGS += -Wthread-safety
-- 
2.51.0.355.g5224444f11-goog