linux-kernel - Re: [PATCH] x86/orc: Don't bail on stack overflow

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Date:   Mon, 27 Nov 2017 10:49:56 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
        Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86/orc: Don't bail on stack overflow


* Ingo Molnar <mingo@...nel.org> wrote:

> Will only push it out if it passes testing.

So far it required the small fix below for 32-bit.

Thanks,

	Ingo

---
 arch/x86/kernel/dumpstack.c  | 7 +++++++
 arch/x86/kernel/process_64.c | 7 -------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index f7f3b5b3bc05..f214f7a6ccad 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -68,6 +68,13 @@ static void printk_stack_address(unsigned long address, int reliable,
 	printk("%s %s%pB\n", log_lvl, reliable ? "" : "? ", (void *)address);
 }
 
+void show_iret_regs(struct pt_regs *regs)
+{
+	printk(KERN_DEFAULT "RIP: %04x:%pS\n", (int)regs->cs, (void *)regs->ip);
+	printk(KERN_DEFAULT "RSP: %04x:%016lx EFLAGS: %08lx", (int)regs->ss,
+		regs->sp, regs->flags);
+}
+
 static void show_regs_safe(struct stack_info *info, struct pt_regs *regs)
 {
 	if (on_stack(info, regs, sizeof(*regs)))
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 2e0e2979e34d..631e229ab428 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -61,13 +61,6 @@
 
 __visible DEFINE_PER_CPU_USER_MAPPED(unsigned long, rsp_scratch);
 
-void show_iret_regs(struct pt_regs *regs)
-{
-	printk(KERN_DEFAULT "RIP: %04lx:%pS\n", regs->cs, (void *)regs->ip);
-	printk(KERN_DEFAULT "RSP: %04lx:%016lx EFLAGS: %08lx", regs->ss,
-		regs->sp, regs->flags);
-}
-
 /* Prints also some state that isn't saved in the pt_regs */
 void __show_regs(struct pt_regs *regs, int all)
 {