Commit f9a196b8 authored May 01, 2009 by Thomas Gleixner

x86: initialize io_bitmap_base on 32bit



commit db949bba (x86-32: use non-lazy
io bitmap context switching) broke ioperm for 32bit because it removed
the lazy initialization of io_bitmap_base and did not set it to the
real bitmap offset.

[ Impact: fix non-working sys_ioperm() on 32-bit kernels ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 2f65dd47

arch/x86/kernel/cpu/common.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1203,6 +1203,8 @@ void __cpuinit cpu_init(void)
		load_TR_desc();
		load_LDT(&init_mm.context);

		t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap);

		#ifdef CONFIG_DOUBLEFAULT
		/* Set up doublefault TSS pointer in the GDT */
		__set_tss_desc(cpu, GDT_ENTRY_DOUBLEFAULT_TSS, &doublefault_tss);