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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20150825201202.6309B6B0@viggo.jf.intel.com>
Date:	Tue, 25 Aug 2015 13:12:02 -0700
From:	Dave Hansen <dave@...1.net>
To:	dave@...1.net
Cc:	dave.hansen@...ux.intel.com, mingo@...hat.com, x86@...nel.org,
	bp@...en8.de, fenghua.yu@...el.com, tim.c.chen@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 01/11] x86, fpu: kill LWP support


From: Dave Hansen <dave.hansen@...ux.intel.com>

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@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: x86@...nel.org
Cc: Borislav Petkov <bp@...en8.de>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
---

 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
_
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/