linux-kernel - Re: [PATCH 4.14 098/146] x86/process: Consolidate and simplify switch_to

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 for Android: free password hash cracker in your pocket

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

Message-ID: <alpine.DEB.2.21.1812041213140.8181@nanos.tec.linutronix.de>
Date:   Tue, 4 Dec 2018 12:14:13 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Kosina <jkosina@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        Dave Stewart <david.c.stewart@...el.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 4.14 098/146] x86/process: Consolidate and simplify
 switch_to_xtra() code

On Tue, 4 Dec 2018, Greg Kroah-Hartman wrote:
> --- a/arch/x86/kernel/process_32.c
> +++ b/arch/x86/kernel/process_32.c
> @@ -234,7 +234,6 @@ __switch_to(struct task_struct *prev_p,
>  	struct fpu *prev_fpu = &prev->fpu;
>  	struct fpu *next_fpu = &next->fpu;
>  	int cpu = smp_processor_id();
> -	struct tss_struct *tss = &per_cpu(cpu_tss_rw, cpu);
>  
>  	/* never put a printk in __switch_to... printk() calls wake_up*() indirectly */
>  
> @@ -266,12 +265,7 @@ __switch_to(struct task_struct *prev_p,
>  	if (get_kernel_rpl() && unlikely(prev->iopl != next->iopl))
>  		set_iopl_mask(next->iopl);
>  
> -	/*
> -	 * Now maybe handle debug registers and/or IO bitmaps
> -	 */
> -	if (unlikely(task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV ||
> -		     task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT))
> -		__switch_to_xtra(prev_p, next_p, tss);
> +	switch_to_extra(prev_p, next_p);

This is missing the hunk below.

Thanks,

	tglx

8<------------------

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 67cecc9a2b6f..c2df91eab573 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -59,6 +59,8 @@
 #include <asm/intel_rdt_sched.h>
 #include <asm/proto.h>
 
+#include "process.h"
+
 void __show_regs(struct pt_regs *regs, int all)
 {
 	unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;