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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-02-21 10:37:54 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-02-22 00:10:16 +1100 |
| commit | 0df977eafc792a5365a7f81d8d5920132e03afad (patch) | |
| tree | 145c1adc8829075f35bbf51742de3a4430259f0f /arch/powerpc/include/asm/processor.h | |
| parent | powerpc: simplify BDI switch (diff) | |
| download | linux-dev-0df977eafc792a5365a7f81d8d5920132e03afad.tar.xz linux-dev-0df977eafc792a5365a7f81d8d5920132e03afad.zip | |
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/asm/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 3 |
1 files changed, 3 insertions, 0 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; |