linux-kernel - Re: [PATCH 2/3] sparc32: remove CONFIG_HAVE_PERF

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Date:	Mon, 25 Oct 2010 08:59:37 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	namhyung@...il.com
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] sparc32: remove CONFIG_HAVE_PERF_EVENTS option

From: Namhyung Kim <namhyung@...il.com>
Date: Tue, 26 Oct 2010 00:52:37 +0900

> Remove HAVE_PERF_EVENTS and PERF_USE_VMALLOC under config
> SPARC because they're under SPARC64 too. Supporting
> perf_event needs atomic64 operations but AFAIK sparc32
> doesn't provide them, CMIIW. ;-) Also removes redundant
> HAVE_IRQ_WORK line.
> 
> Signed-off-by: Namhyung Kim <namhyung@...il.com>

The generic non-hw perf event stuff builds fine on sparc32,
please don't remove this unless you have a legitimate build
failure to report and fix.

Even if sparc32 doesn't provide atomic64_t support, it very
easily could do so using include/asm-generic/atomic64.h which
implements them using spinlocks.
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