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Commit 9fc31ddc authored by Russell King's avatar Russell King
Browse files

ARM: Don't unconditionally bloat thread_info 



There is no point reserving space at the bottom of the kernel stack for
per-thread crunch state, and per-thread VFP state if these are not being
supported by the kernel being built.  Remove these members from the
thread union when these features are disabled.

Reported-by: default avatarTim Bird <tim.bird@am.sony.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 89557642

arch/arm/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -59,7 +59,9 @@ struct thread_info { 
	__u32			syscall;	/* syscall number */

	__u8			used_cp[16];	/* thread used copro */

	unsigned long		tp_value;

#ifdef CONFIG_CRUNCH

	struct crunch_state	crunchstate;

#endif

	union fp_state		fpstate __attribute__((aligned(8)));

	union vfp_state		vfpstate;

#ifdef CONFIG_ARM_THUMBEE

arch/arm/kernel/asm-offsets.c

+2 −0
Original line number Diff line number Diff line
@@ -59,10 +59,12 @@ int main(void) 
  DEFINE(TI_USED_CP,		offsetof(struct thread_info, used_cp));

  DEFINE(TI_TP_VALUE,		offsetof(struct thread_info, tp_value));

  DEFINE(TI_FPSTATE,		offsetof(struct thread_info, fpstate));

#ifdef CONFIG_VFP

  DEFINE(TI_VFPSTATE,		offsetof(struct thread_info, vfpstate));

#ifdef CONFIG_SMP

  DEFINE(VFP_CPU,		offsetof(union vfp_state, hard.cpu));

#endif

#endif

#ifdef CONFIG_ARM_THUMBEE

  DEFINE(TI_THUMBEE_STATE,	offsetof(struct thread_info, thumbee_state));

#endif