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From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@amacapital.net>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 08/24] tools: Simplify BITS_PER_LONG define
Date: Fri, 15 Jul 2016 17:50:42 -0300	[thread overview]
Message-ID: <1468615858-24936-9-git-send-email-acme@kernel.org> (raw)
In-Reply-To: <1468615858-24936-1-git-send-email-acme@kernel.org>

From: Peter Zijlstra <peterz@infradead.org>

Do it using (__CHAR_BIT__ * __SIZEOF_LONG__), simpler, works everywhere,
reduces the complexity by ditching CONFIG_64BIT, that was being
synthesized from yet another set of defines, which proved fragile,
breaking the build on linux-next for no obvious reasons.

Committer Note:

Except on:

gcc version 4.1.2 20080704 (Red Hat 4.1.2-55)

Fallback to __WORDSIZE in that case...

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160715072243.GP30154@twins.programming.kicks-ass.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/include/asm-generic/bitsperlong.h | 23 ++---------------------
 1 file changed, 2 insertions(+), 21 deletions(-)

diff --git a/tools/include/asm-generic/bitsperlong.h b/tools/include/asm-generic/bitsperlong.h
index cfd661c6fc17..45eca517efb3 100644
--- a/tools/include/asm-generic/bitsperlong.h
+++ b/tools/include/asm-generic/bitsperlong.h
@@ -3,31 +3,12 @@
 
 #include <uapi/asm-generic/bitsperlong.h>
 
-/*
- * In the kernel, where this file comes from, we can rely on CONFIG_64BIT,
- * here we have to make amends with what the various compilers provides us
- * to figure out if we're on a 64-bit machine...
- */
 #ifdef __SIZEOF_LONG__
-# if __SIZEOF_LONG__ == 8
-#  define CONFIG_64BIT
-# endif
+#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
 #else
-# ifdef __WORDSIZE
-#  if __WORDSIZE == 64
-#   define CONFIG_64BIT
-#  endif
-# else
-#  error Failed to determine BITS_PER_LONG value
-# endif
+#define BITS_PER_LONG __WORDSIZE
 #endif
 
-#ifdef CONFIG_64BIT
-#define BITS_PER_LONG 64
-#else
-#define BITS_PER_LONG 32
-#endif /* CONFIG_64BIT */
-
 #if BITS_PER_LONG != __BITS_PER_LONG
 #error Inconsistent word size. Check asm/bitsperlong.h
 #endif
-- 
2.7.4

  parent reply	other threads:[~2016-07-15 20:51 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-15 20:50 [GIT PULL 00/24] perf/core improvements and fixes Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 01/24] tools lib traceevent: Add correct header for ipv6 definitions Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 02/24] perf tools: Do not provide dup sched_getcpu() prototype on Android Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 03/24] tools: Make "__always_inline" just "inline" " Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 04/24] perf tools: Just pr_debug() about not being able to read cacheline_size Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 05/24] perf tools: Bail out at "--sort dcacheline" and cacheline_size not known Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 06/24] tools lib api fs: Use base 0 in filename__read_ull Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 07/24] perf evlist: Drop redundant evsel->overwrite indicator Arnaldo Carvalho de Melo
2016-07-15 20:50 ` Arnaldo Carvalho de Melo [this message]
2016-07-15 20:50 ` [PATCH 09/24] tools lib fd array: Allow associating a pointer cookie with each entry Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 10/24] perf evlist: Update mmap related APIs and helpers Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 11/24] perf record: Decouple record__mmap_read() and evlist Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 12/24] perf evlist: Record mmap cookie into fdarray private field Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 13/24] perf evlist: Extract common code in mmap failure processing Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 14/24] perf evlist: Introduce backward_mmap array for evlist Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 15/24] perf evlist: Map backward events to backward_mmap Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 16/24] perf evlist: Drop evlist->backward Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 17/24] perf evlist: Setup backward mmap state machine Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 18/24] perf record: Read from overwritable ring buffer Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 19/24] perf evlist: Make {pause,resume} internal helpers Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 20/24] perf tools: Enable overwrite settings Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 21/24] perf session: Don't warn about out of order event if write_backward is used Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 22/24] perf record: Add --tail-synthesize option Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 23/24] objtool: Add -I$(srctree)/tools/arch/$(ARCH)/include/uapi Arnaldo Carvalho de Melo
2016-07-15 20:50 ` [PATCH 24/24] objtool: Initialize variable to silence old compiler Arnaldo Carvalho de Melo
2016-07-16 20:39 ` [GIT PULL 00/24] perf/core improvements and fixes Ingo Molnar

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