On Tue, Jan 09, 2024 at 04:41:05PM +0530, Disha Goel wrote: > In some distributions, __u64 is already defined in system header files, > causing compilation errors when building xfstest. > > # make > [CC] ext4_resize > ext4_resize.c:17:28: error: conflicting types for '__u64' > typedef unsigned long long __u64; > ^~~~~ > In file included from /usr/include/asm/types.h:26:0, > from /usr/include/linux/types.h:5, > from /usr/include/linux/mount.h:4, > from /usr/include/sys/mount.h:32, > from ext4_resize.c:15: > /usr/include/asm-generic/int-l64.h:30:23: note: previous declaration of '__u64' was here > typedef unsigned long __u64; > ^~~~~ > > To address this issue, configure.ac now checks for the presence and > compilability of <linux/ext4.h>. If found and compilable, the macro > HAVE_LINUX_EXT4_H is defined. The commit also updates src/ext4_resize.c > to conditionally include <linux/ext4.h> based on the presence of the > header, ensuring compatibility with systems where ext4.h is either > present or not. Also include <linux/types.h> which gets __u64 > definition on systems where ext4.h is not present. This change > enhances the configure process and improves code consistency. > > The changes were tested on various distributions on Power > architecture, by successfully compiling xfstest. Additionally, > verified the compatibility by running ext4/033 and ext4/056 > tests, both of which use ext4_resize and observed successful > test execution. > > # make > [CC] detached_mounts_propagation > [CC] ext4_resize > [CC] t_readdir_3 > > Signed-off-by: Disha Goel <disgoel@xxxxxxxxxxxxx> > --- > > Changelog: > v2 -> v3 > Addressed below review comments from Darrick. > Replaced the explicit AC_COMPILE_IFELSE block with a simplified > check using AC_CHECK_HEADERS for <linux/ext4.h>. > Added unconditional inclusion of <linux/types.h> regardless of > the presence of <linux/ext4.h> in ext4_resize.c file. > > v1 -> v2 > Drop usage of uint64_t to match the definition in the kernel uapi > headers. Use <linux/ext4.h> or <linux/types.h> based on the > presence of the header to get the __u64 definition as suggested > by Darrick. > > Link to v1: > https://lore.kernel.org/fstests/20231221061231.44347-1-disgoel@xxxxxxxxxxxxx/T/#u > > Link to v2: > https://lore.kernel.org/fstests/20240103184208.80772-1-disgoel@xxxxxxxxxxxxx/T/#u > > configure.ac | 4 ++++ > src/ext4_resize.c | 5 ++++- > 2 files changed, 8 insertions(+), 1 deletion(-) > > diff --git a/configure.ac b/configure.ac > index b22fc52b..8f9fb062 100644 > --- a/configure.ac > +++ b/configure.ac > @@ -35,6 +35,10 @@ AC_CHECK_HEADERS([ assert.h \ > sys/mman.h \ > ]) > > +AC_CHECK_HEADERS([linux/ext4.h], [ > +AC_DEFINE([HAVE_LINUX_EXT4_H], [1]) > +]) <cough> Quoting the autoconf documentation https://www.gnu.org/software/autoconf/manual/autoconf-2.61/html_node/Generic-Headers.html — Macro: AC_CHECK_HEADERS (header-file..., [action-if-found], [action-if-not-found], [includes = `default-includes']) For each given system header file header-file in the blank-separated argument list that exists, define HAVE_header-file (in all capitals)... --D > + > AC_CHECK_HEADERS([xfs/xfs_log_format.h],,,[ > #define _GNU_SOURCE > #include <xfs/libxfs.h>]) > diff --git a/src/ext4_resize.c b/src/ext4_resize.c > index 78b66432..31779225 100644 > --- a/src/ext4_resize.c > +++ b/src/ext4_resize.c > @@ -13,8 +13,11 @@ > #include <string.h> > #include <sys/ioctl.h> > #include <sys/mount.h> > +#include <linux/types.h> > > -typedef unsigned long long __u64; > +#ifdef HAVE_LINUX_EXT4_H > +#include <linux/ext4.h> > +#endif > > #ifndef EXT4_IOC_RESIZE_FS > #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) > -- > 2.39.1 > >
