diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-02-21 13:37:54 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-21 16:10:16 +0300 |
| commit | 0df977eafc792a5365a7f81d8d5920132e03afad (patch) | |
| tree | 145c1adc8829075f35bbf51742de3a4430259f0f /arch/powerpc/include | |
| parent | 40058337f23f79212f92ed5ef066e90a032905b1 (diff) | |
| download | linux-0df977eafc792a5365a7f81d8d5920132e03afad.tar.xz | |
powerpc/6xx: Don't use SPRN_SPRG2 for storing stack pointer while in RTAS
When calling RTAS, the stack pointer is stored in SPRN_SPRG2
in order to be able to restore it in case of machine check in RTAS.
As machine check is not a perfomance critical path, this patch
frees SPRN_SPRG2 by using a field in thread struct instead.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 1 |
2 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index ee58526cb6c2..e8682122ea3d 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -250,6 +250,9 @@ struct thread_struct { #ifdef CONFIG_PPC32 void *pgdir; /* root of page-table tree */ unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ +#ifdef CONFIG_PPC_RTAS + unsigned long rtas_sp; /* stack pointer for when in RTAS */ +#endif #endif /* Debug Registers */ struct debug_reg debug; diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 1c98ef1f2d5b..371ef6e8248e 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1167,7 +1167,6 @@ #ifdef CONFIG_PPC_BOOK3S_32 #define SPRN_SPRG_SCRATCH0 SPRN_SPRG0 #define SPRN_SPRG_SCRATCH1 SPRN_SPRG1 -#define SPRN_SPRG_RTAS SPRN_SPRG2 #define SPRN_SPRG_603_LRU SPRN_SPRG4 #endif |