From: Namhyung Kim <namhyung@kernel.org>
To: Alireza Haghdoost <haghdoost@uber.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
James Clark <james.clark@linaro.org>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andriin@fb.com>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 1/5] perf symbols: Fix broken ELF_C_READ_MMAP fallback guard
Date: Wed, 4 Nov 2026 12:54:50 -0800 [thread overview]
Message-ID: <auubmvsLenOI2EcV@google.com> (raw)
In-Reply-To: <20261028-perf-symbol-memory-send-v6-1-7e90415f0101@uber.com>
On Wed, Oct 28, 2026 at 04:42:32PM -0700, Alireza Haghdoost wrote:
> Commit 22dd1ac91a77 ("tools: Remove feature-libelf-mmap feature
> detection") replaced perf's compile-time feature test with an #ifdef on
> ELF_C_READ_MMAP. ELF_C_READ_MMAP is an Elf_Cmd enumerator rather than a
> preprocessor macro, so the condition is always false and perf silently
> uses ELF_C_READ.
>
> Perf already requires a sufficiently recent elfutils version that
> provides ELF_C_READ_MMAP. Use the enumerator directly instead of
> restoring a feature probe or retaining an unreachable fallback.
>
> Fixes: 22dd1ac91a77 ("tools: Remove feature-libelf-mmap feature detection")
> Signed-off-by: Alireza Haghdoost <haghdoost@uber.com>
> Reviewed-by: Namhyung Kim <namhyung@kernel.org>
> Reviewed-by: Ian Rogers <irogers@google.com>
Applied to perf-tools-next, thanks!
Best regards
Namhyung
next prev parent reply other threads:[~2026-11-04 20:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 23:42 [PATCH v6 0/5] perf script: Lazy symbol loading Alireza Haghdoost via B4 Relay
2026-10-28 23:42 ` [PATCH v6 1/5] perf symbols: Fix broken ELF_C_READ_MMAP fallback guard Alireza Haghdoost via B4 Relay
2026-11-04 20:54 ` Namhyung Kim [this message]
2026-10-28 23:42 ` [PATCH v6 2/5] perf symbols: Split out name-independent duplicate symbol selection Alireza Haghdoost via B4 Relay
2026-10-30 15:25 ` Ian Rogers
2026-10-28 23:42 ` [PATCH v6 3/5] perf symbols: Point to the symbol name instead of embedding it Alireza Haghdoost via B4 Relay
2026-10-30 15:34 ` Ian Rogers
2026-10-28 23:42 ` [PATCH v6 4/5] perf script: Add --lazy-load-symbols to load symbol names lazily Alireza Haghdoost via B4 Relay
2026-10-30 15:55 ` Ian Rogers
2026-11-01 1:58 ` Namhyung Kim
2026-10-28 23:42 ` [PATCH v6 5/5] perf test: Test lazy symbol name loading Alireza Haghdoost via B4 Relay
2026-10-30 16:01 ` Ian Rogers
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