From d3cb06e0cdc9841b289a0d68acaffd2868504902 Mon Sep 17 00:00:00 2001 From: Anshuman Khandual Date: Thu, 21 May 2015 12:13:04 +0530 Subject: powerpc/dscr: Add some in-code documentation This patch adds some in-code documentation to the DSCR related code to make it more readable without having any functional change to it. Signed-off-by: Anshuman Khandual Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/processor.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/powerpc/include/asm/processor.h') diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index bf117d8fb45f..28ded5d9b579 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -295,6 +295,15 @@ struct thread_struct { #endif #ifdef CONFIG_PPC64 unsigned long dscr; + /* + * This member element dscr_inherit indicates that the process + * has explicitly attempted and changed the DSCR register value + * for itself. Hence kernel wont use the default CPU DSCR value + * contained in the PACA structure anymore during process context + * switch. Once this variable is set, this behaviour will also be + * inherited to all the children of this process from that point + * onwards. + */ int dscr_inherit; unsigned long ppr; /* used to save/restore SMT priority */ #endif -- cgit v1.2.3