linux-kernel - [tip:x86/build] x86, build: Fix portability issues when cross-building

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Date:	Tue, 28 Feb 2012 23:50:27 -0800
From:	"tip-bot for H. Peter Anvin" <hpa@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, nbowler@...iptictech.com,
	hpa@...or.com, mingo@...hat.com, akpm@...ux-foundation.org,
	matt@...sole-pimps.org, tglx@...utronix.de, sfr@...b.auug.org.au
Subject: [tip:x86/build] x86, build:
  Fix portability issues when cross-building

Commit-ID:  a51f4047758d2bcd099ea113b833ed380f4024ba
Gitweb:     http://git.kernel.org/tip/a51f4047758d2bcd099ea113b833ed380f4024ba
Author:     H. Peter Anvin <hpa@...or.com>
AuthorDate: Tue, 28 Feb 2012 23:36:21 -0800
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Tue, 28 Feb 2012 23:40:56 -0800

x86, build: Fix portability issues when cross-building

It would appear that we never actually generated a correct CRC when
building on a bigendian machine.  Depending on the word size, we would
either generate an all-zero CRC (64-bit machine) or a byte-swapped
CRC (32-bit machine.)  Fix the types used so we don't arbitrarily use
a 64-bit word to hold 32-bit numbers, and pass the CRC through
put_unaligned_le32() like all the other numbers.

Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Matt Fleming <matt@...sole-pimps.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nick Bowler <nbowler@...iptictech.com>
Link: http://lkml.kernel.org/r/20120229111322.9eb4b23ff1672e8853ad3b3b@canb.auug.org.au
---
 arch/x86/boot/tools/build.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c
index f3bd2e6..ed54976 100644
--- a/arch/x86/boot/tools/build.c
+++ b/arch/x86/boot/tools/build.c
@@ -36,7 +36,7 @@
 
 typedef unsigned char  u8;
 typedef unsigned short u16;
-typedef unsigned long  u32;
+typedef unsigned int   u32;
 
 #define DEFAULT_MAJOR_ROOT 0
 #define DEFAULT_MINOR_ROOT 0
@@ -247,8 +247,9 @@ int main(int argc, char ** argv)
 	}
 
 	/* Write the CRC */
-	fprintf(stderr, "CRC %lx\n", crc);
-	if (fwrite(&crc, 1, 4, stdout) != 4)
+	fprintf(stderr, "CRC %x\n", crc);
+	put_unaligned_le32(crc, buf);
+	if (fwrite(buf, 1, 4, stdout) != 4)
 		die("Writing CRC failed");
 
 	close(fd);
--
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