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| 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/kernel/asm-offsets.c | |
| 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/kernel/asm-offsets.c')
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 9ffc72ded73a..d6f9bdb1eb2e 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -93,6 +93,9 @@ int main(void) OFFSET(THREAD_INFO, task_struct, stack); DEFINE(THREAD_INFO_GAP, _ALIGN_UP(sizeof(struct thread_info), 16)); OFFSET(KSP_LIMIT, thread_struct, ksp_limit); +#ifdef CONFIG_PPC_RTAS + OFFSET(RTAS_SP, thread_struct, rtas_sp); +#endif #endif /* CONFIG_PPC64 */ #ifdef CONFIG_LIVEPATCH |