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x86/mm/pkeys: Do not skip PKRU register if debug registers are not used 

__show_regs() fails to dump the PKRU state when the debug registers are in
their default state because there is a return statement on the debug
register state.

Change the logic to report PKRU value even when debug registers are in
their default state.

Fixes:c0b17b5bd4b7 ("x86/mm/pkeys: Dump PKRU with other kernel registers")
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: http://lkml.kernel.org/r/20160910183045.4618-1-nicolas.iooss_linux@m4x.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Nicolas Iooss 2016-09-10 20:30:45 +02:00 committed by Thomas Gleixner
parent e2753293ac
commit ba6d018e3d
1 changed files with 7 additions and 6 deletions
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13
arch/x86/kernel/process_64.c
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@ -110,12 +110,13 @@ void __show_regs(struct pt_regs *regs, int all)
get_debugreg(d7, 7);
/* Only print out debug registers if they are in their non-default state. */
if ((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) &&
(d6 == DR6_RESERVED) && (d7 == 0x400))
return;
printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);
if (!((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) &&
(d6 == DR6_RESERVED) && (d7 == 0x400))) {
printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n",
d0, d1, d2);
printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n",
d3, d6, d7);
}
if (boot_cpu_has(X86_FEATURE_OSPKE))
printk(KERN_DEFAULT "PKRU: %08x\n", read_pkru());