linux-kernel - [RFC PATCH] ARM Fix /usr/bin/xargs: etags: Argument list too long

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Date:	Wed, 8 Aug 2012 14:32:51 +0000
From:	David Cullen <David.Cullen@...-americas.com>
To:	"mmarek@...e.cz" <mmarek@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] ARM Fix /usr/bin/xargs: etags: Argument list too long

Patch applies to

    commit 42a579a0f960081cd16fc945036e4780c3ad3202

When running "make ARCH=arm TAGS" in a chroot using qemu-arm-static,
the following message is emitted:

    [user@...t:/home/work/linux]: make ARCH=arm TAGS
      GEN     TAGS
    /usr/bin/xargs: etags: Argument list too long

This can be fixed by by passing "-L 1024" to xargs in scripts/tags.sh.

The "1024" was a guess. A value of "3862" changes the message to

    /usr/bin/xargs: argument list too long

Using "2048" also fixes the problem. However, I don't know how much
headroom that leaves

Does anyone know why the argument lists must be shorter for ARM? All
of the documentation I have available says that 4096 should be the
limit.

Signed-off-by: David Cullen <david.cullen@...-americas.com>
---
 scripts/tags.sh |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/tags.sh b/scripts/tags.sh
index cff8faa..7f4ebb3 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -121,7 +121,7 @@ dogtags()

 exuberant()
 {
-       all_sources | xargs $1 -a                               \
+       all_sources | xargs -L 1024 $1 -a                       \
        -I __initdata,__exitdata,__acquires,__releases          \
        -I __read_mostly,____cacheline_aligned                  \
        -I ____cacheline_aligned_in_smp                         \
--
1.7.9.5--
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