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powerpc: Move THREAD_SHIFT config to Kconfig

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Shift the logic for defining THREAD_SHIFT logic to Kconfig in order to
allow override by users.

Signed-off-by: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Hamish Martin 2017-02-24 13:52:09 +13:00 committed by Michael Ellerman
parent 97da3854c5
commit 476134070c
2 changed files with 11 additions and 9 deletions
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10
arch/powerpc/Kconfig
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@ -678,6 +678,16 @@ config PPC_256K_PAGES
endchoice
config THREAD_SHIFT
int "Thread shift" if EXPERT
range 13 15
default "15" if PPC_256K_PAGES
default "14" if PPC64
default "13"
help
Used to define the stack size. The default is almost always what you
want. Only change this if you know what you are doing.
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 8 9 if PPC64 && PPC_64K_PAGES

10
arch/powerpc/include/asm/thread_info.h
View File

@ -10,15 +10,7 @@
#ifdef __KERNEL__
/* We have 8k stacks on ppc32 and 16k on ppc64 */
#if defined(CONFIG_PPC64)
#define THREAD_SHIFT 14
#elif defined(CONFIG_PPC_256K_PAGES)
#define THREAD_SHIFT 15
#else
#define THREAD_SHIFT 13
#endif
#define THREAD_SHIFT CONFIG_THREAD_SHIFT
#define THREAD_SIZE (1 << THREAD_SHIFT)