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x86/entry: Convert Device not available exception to IDTENTRY

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Convert #NM to IDTENTRY:
  - Implement the C entry point with DEFINE_IDTENTRY
  - Emit the ASM stub with DECLARE_IDTENTRY
  - Remove the ASM idtentry in 64bit
  - Remove the open coded ASM entry code in 32bit
  - Fixup the XEN/PV code
  - Remove the old prototypes
  - Remove the RCU warning as the new entry macro ensures correctness

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134905.056243863@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-02-25 23:16:19 +01:00
parent 49893c5cb2
commit 866ae2ccee
8 changed files with 6 additions and 20 deletions
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8
arch/x86/kernel/traps.c
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@@ -882,13 +882,10 @@ do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
*/
}
dotraplinkage void
do_device_not_available(struct pt_regs *regs, long error_code)
DEFINE_IDTENTRY(exc_device_not_available)
{
unsigned long cr0 = read_cr0();
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
#ifdef CONFIG_MATH_EMULATION
if (!boot_cpu_has(X86_FEATURE_FPU) && (cr0 & X86_CR0_EM)) {
struct math_emu_info info = { };
@@ -913,10 +910,9 @@ do_device_not_available(struct pt_regs *regs, long error_code)
* to kill the task than getting stuck in a never-ending
* loop of #NM faults.
*/
die("unexpected #NM exception", regs, error_code);
die("unexpected #NM exception", regs, 0);
}
}
NOKPROBE_SYMBOL(do_device_not_available);
#ifdef CONFIG_X86_32
dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)