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Two fixes:

Browse Source 
- Fix a (hopefully final) IRQ state tracking bug vs. MCE handling
  - Fix a documentation link
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2020-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Two fixes:

   - Fix a (hopefully final) IRQ state tracking bug vs MCE handling

   - Fix a documentation link"

* tag 'x86-urgent-2020-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation/x86: Fix incorrect references to zero-page.txt
  x86/mce: Use idtentry_nmi_enter/exit()
This commit is contained in:
Linus Torvalds 2020-10-11 10:53:37 -07:00
commit c120ec12e2
2 changed files with 7 additions and 5 deletions
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6
Documentation/x86/boot.rst
View File

@ -1342,8 +1342,8 @@ follow::
In addition to read/modify/write the setup header of the struct
boot_params as that of 16-bit boot protocol, the boot loader should
also fill the additional fields of the struct boot_params as that
described in zero-page.txt.
also fill the additional fields of the struct boot_params as
described in chapter :doc:`zero-page`.
After setting up the struct boot_params, the boot loader can load the
32/64-bit kernel in the same way as that of 16-bit boot protocol.
@ -1379,7 +1379,7 @@ can be calculated as follows::
In addition to read/modify/write the setup header of the struct
boot_params as that of 16-bit boot protocol, the boot loader should
also fill the additional fields of the struct boot_params as described
in zero-page.txt.
in chapter :doc:`zero-page`.
After setting up the struct boot_params, the boot loader can load
64-bit kernel in the same way as that of 16-bit boot protocol, but

6
arch/x86/kernel/cpu/mce/core.c
View File

@ -1904,6 +1904,8 @@ void (*machine_check_vector)(struct pt_regs *) = unexpected_machine_check;
static __always_inline void exc_machine_check_kernel(struct pt_regs *regs)
{
bool irq_state;
WARN_ON_ONCE(user_mode(regs));
/*
@ -1914,7 +1916,7 @@ static __always_inline void exc_machine_check_kernel(struct pt_regs *regs)
mce_check_crashing_cpu())
return;
nmi_enter();
irq_state = idtentry_enter_nmi(regs);
/*
* The call targets are marked noinstr, but objtool can't figure
* that out because it's an indirect call. Annotate it.
@ -1925,7 +1927,7 @@ static __always_inline void exc_machine_check_kernel(struct pt_regs *regs)
if (regs->flags & X86_EFLAGS_IF)
trace_hardirqs_on_prepare();
instrumentation_end();
nmi_exit();
idtentry_exit_nmi(regs, irq_state);
}
static __always_inline void exc_machine_check_user(struct pt_regs *regs)