[PATCH 01/11] x86, fpu: kill LWP support

[Dave Hansen]

From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>

LightWeight Profiling was evidently an AMD profiling feature that
we never got around to implementing.  Remove the references to it.

This patch is a *bit* worrisome becuase it will implicitly cause
'struct xregs_state' to shrink.  This effectively removes some
unused padding that we had in there.  It might expose other bugs.

Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---

 b/arch/x86/include/asm/fpu/types.h |    6 ------
 1 file changed, 6 deletions(-)

diff -puN arch/x86/include/asm/fpu/types.h~axe-lwp arch/x86/include/asm/fpu/types.h
--- a/arch/x86/include/asm/fpu/types.h~axe-lwp	2015-08-25 12:49:58.024487848 -0700
+++ b/arch/x86/include/asm/fpu/types.h	2015-08-25 12:49:58.027487984 -0700
@@ -132,11 +132,6 @@ struct ymmh_struct {
 	u8				ymmh_space[256];
 };
 
-/* We don't support LWP yet: */
-struct lwp_struct {
-	u8				reserved[128];
-};
-
 /* Intel MPX support: */
 struct bndreg {
 	u64				lower_bound;
@@ -161,7 +156,6 @@ struct xstate_header {
 
 /* New processor state extensions should be added here: */
 #define XSTATE_RESERVE			(sizeof(struct ymmh_struct) + \
-					 sizeof(struct lwp_struct)  + \
 					 sizeof(struct mpx_struct)  )
 /*
  * This is our most modern FPU state format, as saved by the XSAVE
_
--
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