[PATCH 3/6] powerpc: Add ppr in thread_info struct
From: Haren Myneni <hidden>
Date: 2012-09-09 11:40:45
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
ppr in thread_info is used to save PPR and restore it before process exits from kernel. This patch sets the default priority to 3 when tasks are created such that users can use 4 for higher priority tasks. Signed-off-by: Haren Myneni <haren@us.ibm.com> --- arch/powerpc/include/asm/thread_info.h | 11 +++++++++++ arch/powerpc/kernel/asm-offsets.c | 1 + 2 files changed, 12 insertions(+)
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index faf9352..ea53542 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h@@ -46,10 +46,20 @@ struct thread_info { struct restart_block restart_block; unsigned long local_flags; /* private flags for thread */ + unsigned long ppr; /* SMT Thread status register */ /* low level flags - has atomic operations done on it */ unsigned long flags ____cacheline_aligned_in_smp; }; +#ifdef CONFIG_PPC64 +/* Default SMT priority to (11- 13bits). */ +/* .ppr is Used to save/restore only on P7 or later */ +#define INIT_PPR \ + .ppr = (3ull << 50), +#else +#define INIT_PPR +#endif + /* * macros/functions for gaining access to the thread information structure */
@@ -62,6 +72,7 @@ struct thread_info { .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ + INIT_PPR \ .flags = 0, \ }
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index e899572..1c2c066 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c@@ -128,6 +128,7 @@ int main(void) DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); #ifdef CONFIG_PPC64 + DEFINE(TI_PPR, offsetof(struct thread_info, ppr)); DEFINE(DCACHEL1LINESIZE, offsetof(struct ppc64_caches, dline_size)); DEFINE(DCACHEL1LOGLINESIZE, offsetof(struct ppc64_caches, log_dline_size)); DEFINE(DCACHEL1LINESPERPAGE, offsetof(struct ppc64_caches, dlines_per_page));
--
1.7.10.4