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Commit e0e5070b authored by Zefan Li's avatar Zefan Li Committed by Tejun Heo
Browse files

sched: add macros to define bitops for task atomic flags 



This will simplify code when we add new flags.

v3:
- Kees pointed out that no_new_privs should never be cleared, so we
shouldn't define task_clear_no_new_privs(). we define 3 macros instead
of a single one.

v2:
- updated scripts/tags.sh, suggested by Peter

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miao Xie <miaox@cn.fujitsu.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarZefan Li <lizefan@huawei.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent a2b86f77

include/linux/sched.h

+12 −9
Original line number Diff line number Diff line
@@ -1959,15 +1959,18 @@ static inline void memalloc_noio_restore(unsigned int flags) 
/* Per-process atomic flags. */

#define PFA_NO_NEW_PRIVS 0	/* May not gain new privileges. */



static inline bool task_no_new_privs(struct task_struct *p)

{

	return test_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);

}



static inline void task_set_no_new_privs(struct task_struct *p)

{

	set_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);

}

#define TASK_PFA_TEST(name, func)					\

	static inline bool task_##func(struct task_struct *p)		\

	{ return test_bit(PFA_##name, &p->atomic_flags); }

#define TASK_PFA_SET(name, func)					\

	static inline void task_set_##func(struct task_struct *p)	\

	{ set_bit(PFA_##name, &p->atomic_flags); }

#define TASK_PFA_CLEAR(name, func)					\

	static inline void task_clear_##func(struct task_struct *p)	\

	{ clear_bit(PFA_##name, &p->atomic_flags); }



TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)

TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)



/*

 * task->jobctl flags

scripts/tags.sh

+6 −0
Original line number Diff line number Diff line
@@ -197,6 +197,9 @@ exuberant() 
	--regex-c++='/SETPCGFLAG\(([^,)]*).*/SetPageCgroup\1/'		\

	--regex-c++='/CLEARPCGFLAG\(([^,)]*).*/ClearPageCgroup\1/'	\

	--regex-c++='/TESTCLEARPCGFLAG\(([^,)]*).*/TestClearPageCgroup\1/' \

	--regex-c++='/TASK_PFA_TEST\([^,]*,\s*([^)]*)\)/task_\1/'	\

	--regex-c++='/TASK_PFA_SET\([^,]*,\s*([^)]*)\)/task_set_\1/'	\

	--regex-c++='/TASK_PFA_CLEAR\([^,]*,\s*([^)]*)\)/task_clear_\1/'\

	--regex-c='/PCI_OP_READ\((\w*).*[1-4]\)/pci_bus_read_config_\1/' \

	--regex-c='/PCI_OP_WRITE\((\w*).*[1-4]\)/pci_bus_write_config_\1/' \

	--regex-c='/DEFINE_(MUTEX|SEMAPHORE|SPINLOCK)\((\w*)/\2/v/'	\
@@ -260,6 +263,9 @@ emacs() 
	--regex='/SETPCGFLAG\(([^,)]*).*/SetPageCgroup\1/'	\

	--regex='/CLEARPCGFLAG\(([^,)]*).*/ClearPageCgroup\1/'	\

	--regex='/TESTCLEARPCGFLAG\(([^,)]*).*/TestClearPageCgroup\1/' \

	--regex='/TASK_PFA_TEST\([^,]*,\s*([^)]*)\)/task_\1/'		\

	--regex='/TASK_PFA_SET\([^,]*,\s*([^)]*)\)/task_set_\1/'	\

	--regex='/TASK_PFA_CLEAR\([^,]*,\s*([^)]*)\)/task_clear_\1/'	\

	--regex='/_PE(\([^,)]*\).*/PEVENT_ERRNO__\1/'		\

	--regex='/PCI_OP_READ(\([a-z]*[a-z]\).*[1-4])/pci_bus_read_config_\1/' \

	--regex='/PCI_OP_WRITE(\([a-z]*[a-z]\).*[1-4])/pci_bus_write_config_\1/'\