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authorArnd Bergmann <arnd@arndb.de>2009-09-21 16:37:12 +0200
committerSam Ravnborg <sam@ravnborg.org>2009-10-11 23:21:25 +0200
commitc01226c3145d173a0d38f9d5b4f229cc23d99ae2 (patch)
tree7f0eb41f9da3b412115694752d07cb85bb707bdb
parent17c5ca98833dc3d8f8dd4e85487da238c50cd8c9 (diff)
downloadlwn-c01226c3145d173a0d38f9d5b4f229cc23d99ae2.tar.gz
lwn-c01226c3145d173a0d38f9d5b4f229cc23d99ae2.zip
warn about use of uninstalled kernel headers
User applications frequently hit problems when they try to use the kernel headers directly, rather than the exported headers. This adds an explicit warning for this case, and points to a URL holding an explanation of why this is wrong and what to do about it. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
-rw-r--r--include/linux/kernel.h6
-rw-r--r--scripts/headers_install.pl2
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d3cd23f30039..f4e3184fa054 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -659,6 +659,12 @@ extern int do_sysinfo(struct sysinfo *info);
#endif /* __KERNEL__ */
+#ifndef __EXPORTED_HEADERS__
+#ifndef __KERNEL__
+#warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders
+#endif /* __KERNEL__ */
+#endif /* __EXPORTED_HEADERS__ */
+
#define SI_LOAD_SHIFT 16
struct sysinfo {
long uptime; /* Seconds since boot */
diff --git a/scripts/headers_install.pl b/scripts/headers_install.pl
index c6ae4052ab43..b89ca2c58fdb 100644
--- a/scripts/headers_install.pl
+++ b/scripts/headers_install.pl
@@ -20,7 +20,7 @@ use strict;
my ($readdir, $installdir, $arch, @files) = @ARGV;
-my $unifdef = "scripts/unifdef -U__KERNEL__";
+my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
foreach my $file (@files) {
local *INFILE;