Re: [PATCH] audit: Fix build failure by renaming struct node to struct audit_node
Le 03/09/2021 à 19:06, Paul Moore a écrit :
On Fri, Sep 3, 2021 at 11:48 AM Christophe Leroy
<christophe.leroy(a)csgroup.eu> wrote:
>
> struct node defined in kernel/audit_tree.c conflicts with
> struct node defined in include/linux/node.h
>
> CC kernel/audit_tree.o
> kernel/audit_tree.c:33:9: error: redefinition of 'struct node'
> 33 | struct node {
> | ^~~~
> In file included from ./include/linux/cpu.h:17,
> from ./include/linux/static_call.h:102,
> from ./arch/powerpc/include/asm/machdep.h:10,
> from ./arch/powerpc/include/asm/archrandom.h:7,
> from ./include/linux/random.h:121,
> from ./include/linux/net.h:18,
> from ./include/linux/skbuff.h:26,
> from kernel/audit.h:11,
> from kernel/audit_tree.c:2:
> ./include/linux/node.h:84:8: note: originally defined here
> 84 | struct node {
> | ^~~~
> make[2]: *** [kernel/audit_tree.o] Error 1
>
> Rename it audit_node.
>
> Signed-off-by: Christophe Leroy <christophe.leroy(a)csgroup.eu>
> ---
> kernel/audit_tree.c | 20 ++++++++++----------
> 1 file changed, 10 insertions(+), 10 deletions(-)
That's interesting, I wonder why we didn't see this prior? Also as an
aside, there are evidently a good handful of symbols named "node". In
fact I don't see this now in the audit/stable-5.15 or Linus' tree as
of a right now, both using an allyesconfig:
% git show-ref HEAD
a9c9a6f741cdaa2fa9ba24a790db8d07295761e3 refs/remotes/linus/HEAD
% touch kernel/audit_tree.c
% make C=1 kernel/
CALL scripts/checksyscalls.sh
CALL scripts/atomic/check-atomics.sh
DESCEND objtool
CHK kernel/kheaders_data.tar.xz
CC kernel/audit_tree.o
CHECK kernel/audit_tree.c
AR kernel/built-in.a
What tree and config are you using where you see this error? Looking
at your error, I'm guessing this is limited to ppc builds, and if I
look at the arch/powerpc/include/asm/machdep.h file in Linus tree I
don't see a static_call.h include so I'm guessing this is a -next tree
for ppc? Something else?
Without knowing the context, is adding the static_call.h include in
arch/powerpc/include/asm/machdep.h intentional or simply a bit of
include file creep?
struct machdep_calls in asm/machdep.h is full of function pointers and
I'm working on converting that to static_calls
(https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=260878&...)
So yes, adding static_call.h in asm/machdep.h is intentional and the
issue was detected by CI build test
(http://kisskb.ellerman.id.au/kisskb/buildresult/14628100/)
I submitted this change to you because for me it make sense to not
re-use globably defined struct names in local C files, and anybody may
encounter the problem as soon as linux/node.h gets included directly or
indirectly. But if you prefer I guess the fix may be merged through
powerpc tree as part of this series.
Thanks,
Christophe