warn about use of uninstalled kernel headers (c01226c3) · Commits · 戴 / test

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>

include/linux/kernel.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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 */

scripts/headers_install.pl

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

Admin message