linux-kernel - Re: [RFC trollpatch 1/1] genirq: Remove the fits all and nothing __do

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Date:	Mon, 27 Sep 2010 21:48:34 +0200
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-alpha@...r.kernel.org, linux-cris-kernel@...s.com,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Greg Ungerer <gerg@...inux.org>, Jeff Dike <jdike@...toit.com>,
	linux-parisc@...r.kernel.org, Chris Zankel <chris@...kel.net>,
	linux-arch@...r.kernel.org
Subject: Re: [RFC trollpatch 1/1] genirq: Remove the fits all and nothing
 __do_IRQ() code

On Wed, Sep 8, 2010 at 8:14 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> __do_IRQ() has been deprecated after a two years migration phase in
>  The following architectures are still using __do_IRQ():
>
>  alpha, cris, ia64, h8300, m32r, m68knommu, parisc, um
>

Maybe I'm naive but shouldn't this path work?
Does um need some extra work?

The linux executable aborts immediately when I apply my patch.

---cut---
Locating the bottom of the address space ... 0x10000
Locating the top of the address space ... 0xc0000000
Core dump limits :
        soft - 0
        hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...nothing mounted on /dev/shm
Checking PROT_EXEC mmap in /tmp/...OK
Checking for the skas3 patch in the host:
  - /proc/mm...not found: No such file or directory
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found
UML running in SKAS0 mode
Aborted
---cut---

diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um
index ec2b8da..ae950e0 100644
--- a/arch/um/Kconfig.um
+++ b/arch/um/Kconfig.um
@@ -147,3 +147,8 @@ config KERNEL_STACK_ORDER
          This option determines the size of UML kernel stacks.  They will
          be 1 << order pages.  The default is OK unless you're running Valgrind
          on UML, in which case, set this to 3.
+
+config GENERIC_HARDIRQS_NO__DO_IRQ
+       def_bool y
+
+
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index a3f0b04..3d44535 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -334,7 +334,7 @@ unsigned int do_IRQ(int irq, struct uml_pt_regs *regs)
 {
        struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
        irq_enter();
-       __do_IRQ(irq);
+       generic_handle_irq(irq);
        irq_exit();
        set_irq_regs(old_regs);
        return 1;
--
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