Hello
I've just changed %09lx to %09pK on my driver code to hide the address, but I
faced compiler error. The %9pK without 0 worked.
Is there restriction on %pK which does now allow %0 ? I've wondered whether I
did wrong or it is a printk problem.
To show easily I tried to add pr_info("%09pK\n", nodemask); in page_alloc.c
Then here's what I did.
$ ARCH=x86 make x86_64_defconfig ; make mm/page_alloc.o
#
# No change to .config
#
CALL scripts/checksyscalls.sh
DESCEND objtool
INSTALL libsubcmd_headers
CC mm/page_alloc.o
In file included from ./include/asm-generic/bug.h:22:0,
from ./arch/x86/include/asm/bug.h:87,
from ./include/linux/bug.h:5,
from ./include/linux/mmdebug.h:5,
from ./include/linux/mm.h:6,
from mm/page_alloc.c:19:
mm/page_alloc.c: In function ‘__alloc_pages’:
./include/linux/kern_levels.h:5:18: error: '0' flag used with ‘%p’ gnu_printf format [-Werror=format=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
./include/linux/printk.h:427:11: note: in definition of macro ‘printk_index_wrap’
_p_func(_fmt, ##__VA_ARGS__); \
^
./include/linux/printk.h:528:2: note: in expansion of macro ‘printk’
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
^
./include/linux/kern_levels.h:14:19: note: in expansion of macro ‘KERN_SOH’
#define KERN_INFO KERN_SOH "6" /* informational */
^
./include/linux/printk.h:528:9: note: in expansion of macro ‘KERN_INFO’
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
^
mm/page_alloc.c:5564:2: note: in expansion of macro ‘pr_info’
pr_info("%09pK\n", nodemask);
^
Jaewon Kim
