From: David Laight <David.Laight@ACULAB.COM>
To: 'Thomas Gleixner' <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>
Cc: "x86@kernel.org" <x86@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Helge Deller <deller@gmx.de>,
"David S. Miller" <davem@davemloft.net>,
Michael Ellerman <mpe@ellerman.id.au>,
Rich Felker <dalias@libc.org>,
"Heiko Carstens" <hca@linux.ibm.com>,
Kees Cook <keescook@chromium.org>,
"Lai Jiangshan" <jiangshanlai+lkml@gmail.com>
Subject: RE: [patch V2 03/13] x86/irq/64: Adjust the per CPU irq stack pointer by 8
Date: Wed, 10 Feb 2021 11:41:34 +0000 [thread overview]
Message-ID: <c7d8e27f99a5410dac934925e0f89a7c@AcuMS.aculab.com> (raw)
In-Reply-To: <20210210002512.354260928@linutronix.de>
From: Thomas Gleixner
> Sent: 09 February 2021 23:41
> From: Thomas Gleixner <tglx@linutronix.de>
>
> The per CPU hardirq_stack_ptr contains the pointer to the irq stack in the
> form that it is ready to be assigned to [ER]SP so that the first push ends
> up on the top entry of the stack.
...
> Do the -8 adjustment right when storing the pointer and make the data type
> a void pointer to avoid confusion vs. the struct irq_stack data type which
> is on 64bit only used to declare the backing store...
It might be better to make it a pointer to an undefined struct.
That will stop all accidental assignments - except those that
are already 'void *'.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2021-02-10 11:47 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 23:40 [patch V2 00/13] x86/irq/64: Inline irq stack switching Thomas Gleixner
2021-02-09 23:40 ` [patch V2 01/13] x86/entry: Fix instrumentation annotation Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 02/13] x86/irq: Sanitize irq stack tracking Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 03/13] x86/irq/64: Adjust the per CPU irq stack pointer by 8 Thomas Gleixner
2021-02-10 11:41 ` David Laight [this message]
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 04/13] x86/apic: Split out spurious handling code Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 05/13] x86/irq: Provide macro for inlining irq stack switching Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 06/13] x86/entry: Convert system vectors to irq stack macro Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 07/13] x86/entry: Convert device interrupts to inline stack switching Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 08/13] x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 09/13] x86/softirq: Remove indirection in do_softirq_own_stack() Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 10/13] x86: Select CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 11/13] softirq: Move __ARCH_HAS_DO_SOFTIRQ to Kconfig Thomas Gleixner
2021-02-10 7:03 ` Kees Cook
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 12/13] softirq: Move do_softirq_own_stack() to generic asm header Thomas Gleixner
2021-02-10 7:04 ` Kees Cook
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-09 23:40 ` [patch V2 13/13] x86/softirq/64: Inline do_softirq_own_stack() Thomas Gleixner
2021-02-11 0:50 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2021-02-15 16:39 ` [patch V2 13/13] " Guenter Roeck
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