From: Will Deacon <will@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
lenb@kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org, mhiramat@kernel.org,
ndesaulniers@google.com, ojeda@kernel.org,
rafael.j.wysocki@intel.com, revest@chromium.org,
robert.moore@intel.com, rostedt@goodmis.org
Subject: Re: [PATCH 3/8] arm64: Extend support for CONFIG_FUNCTION_ALIGNMENT
Date: Tue, 10 Jan 2023 20:43:20 +0000 [thread overview]
Message-ID: <20230110204320.GA9739@willie-the-truck> (raw)
In-Reply-To: <Y73MBswL76Hi9cay@hirez.programming.kicks-ass.net>
On Tue, Jan 10, 2023 at 09:35:18PM +0100, Peter Zijlstra wrote:
> On Mon, Jan 09, 2023 at 01:58:23PM +0000, Mark Rutland wrote:
>
> > diff --git a/arch/arm64/include/asm/linkage.h b/arch/arm64/include/asm/linkage.h
> > index 1436fa1cde24d..df18a3446ce82 100644
> > --- a/arch/arm64/include/asm/linkage.h
> > +++ b/arch/arm64/include/asm/linkage.h
> > @@ -5,8 +5,14 @@
> > #include <asm/assembler.h>
> > #endif
> >
> > -#define __ALIGN .align 2
> > -#define __ALIGN_STR ".align 2"
> > +#if CONFIG_FUNCTION_ALIGNMENT > 0
> > +#define ARM64_FUNCTION_ALIGNMENT CONFIG_FUNCTION_ALIGNMENT
> > +#else
> > +#define ARM64_FUNCTION_ALIGNMENT 4
> > +#endif
> > +
> > +#define __ALIGN .balign ARM64_FUNCTION_ALIGNMENT
> > +#define __ALIGN_STR ".balign " #ARM64_FUNCTION_ALIGNMENT
>
> Isn't that much the same as having ARM64 select FUNCTION_ALIGNMENT_4B
> and simply removing all these lines and relying on the default
> behaviour?
There's a proposal (with some rough performance claims) to select
FUNCTION_ALIGNMENT_16B over at:
https://lore.kernel.org/r/20221208053649.540891-1-almasrymina@google.com
so we could just go with that?
Will
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next prev parent reply other threads:[~2023-01-10 20:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-09 13:58 [PATCH 0/8] arm64/ftrace: Add support for DYNAMIC_FTRACE_WITH_CALL_OPS Mark Rutland
2023-01-09 13:58 ` [PATCH 1/8] Compiler attributes: GCC function alignment workarounds Mark Rutland
2023-01-09 14:43 ` Miguel Ojeda
2023-01-09 17:06 ` Mark Rutland
2023-01-09 22:35 ` Miguel Ojeda
2023-01-11 18:27 ` Mark Rutland
2023-01-12 11:38 ` Mark Rutland
2023-01-13 12:49 ` Mark Rutland
2023-01-15 21:32 ` Miguel Ojeda
2023-01-09 13:58 ` [PATCH 2/8] ACPI: Don't build ACPICA with '-Os' Mark Rutland
2023-01-10 13:45 ` Rafael J. Wysocki
2023-01-09 13:58 ` [PATCH 3/8] arm64: Extend support for CONFIG_FUNCTION_ALIGNMENT Mark Rutland
2023-01-10 20:35 ` Peter Zijlstra
2023-01-10 20:43 ` Will Deacon [this message]
2023-01-11 11:39 ` Mark Rutland
2023-01-11 11:36 ` Mark Rutland
2023-01-09 13:58 ` [PATCH 4/8] ftrace: Add DYNAMIC_FTRACE_WITH_CALL_OPS Mark Rutland
2023-01-12 6:48 ` Li Huafei
2023-01-12 11:00 ` Mark Rutland
2023-01-13 1:15 ` Li Huafei
2023-01-09 13:58 ` [PATCH 5/8] arm64: insn: Add helpers for BTI Mark Rutland
2023-01-09 13:58 ` [PATCH 6/8] arm64: patching: Add aarch64_insn_write_literal_u64() Mark Rutland
2023-01-09 13:58 ` [PATCH 7/8] arm64: ftrace: Update stale comment Mark Rutland
2023-01-09 13:58 ` [PATCH 8/8] arm64: Implement HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS Mark Rutland
2023-01-10 8:55 ` [PATCH 0/8] arm64/ftrace: Add support for DYNAMIC_FTRACE_WITH_CALL_OPS David Laight
2023-01-10 10:31 ` Mark Rutland
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