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Commit 7ffb9e11 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Ingo Molnar:
 "This tree includes:

   - a fix that disables the compacted FPU XSAVE format by disabling
     XSAVES support: the fixes are too complex and the breakages
     ABI-affecting, so we want this to be quirked off in a robust way
     and backported, to make sure no broken kernel is exposed to the new
     hardware (which exposure is still very limited).

   - an MCE printk message fix

   - a documentation fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Disable XSAVES* support for now
  x86/Documentation: Update the contact email for L3 cache index disable functionality
  x86/mce: Fix MCE severity messages
parents 70d7d88f e88221c5

Documentation/ABI/testing/sysfs-devices-system-cpu

+1 −1
Original line number Diff line number Diff line
@@ -162,7 +162,7 @@ Description: Discover CPUs in the same CPU frequency coordination domain 
What:		/sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1}

Date:		August 2008

KernelVersion:	2.6.27

Contact:	discuss@x86-64.org

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:	Disable L3 cache indices



		These files exist in every CPU's cache/index3 directory. Each

arch/x86/kernel/cpu/mcheck/mce.c

+5 −2
Original line number Diff line number Diff line
@@ -708,6 +708,7 @@ static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp, 
			  struct pt_regs *regs)

{

	int i, ret = 0;

	char *tmp;



	for (i = 0; i < mca_cfg.banks; i++) {

		m->status = mce_rdmsrl(MSR_IA32_MCx_STATUS(i));
@@ -716,10 +717,12 @@ static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp, 
			if (quirk_no_way_out)

				quirk_no_way_out(i, m, regs);

		}

		if (mce_severity(m, mca_cfg.tolerant, msg, true) >=

		    MCE_PANIC_SEVERITY)



		if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) {

			*msg = tmp;

			ret = 1;

		}

	}

	return ret;

}

arch/x86/kernel/i387.c

+15 −0
Original line number Diff line number Diff line
@@ -173,6 +173,21 @@ static void init_thread_xstate(void) 
		xstate_size = sizeof(struct i387_fxsave_struct);

	else

		xstate_size = sizeof(struct i387_fsave_struct);



	/*

	 * Quirk: we don't yet handle the XSAVES* instructions

	 * correctly, as we don't correctly convert between

	 * standard and compacted format when interfacing

	 * with user-space - so disable it for now.

	 *

	 * The difference is small: with recent CPUs the

	 * compacted format is only marginally smaller than

	 * the standard FPU state format.

	 *

	 * ( This is easy to backport while we are fixing

	 *   XSAVES* support. )

	 */

	setup_clear_cpu_cap(X86_FEATURE_XSAVES);

}



/*