Commit 10340ae1 authored Nov 16, 2010 by Suresh Siddha Committed by H. Peter Anvin Dec 13, 2010

x86, xsave: Use alloc_bootmem_align() instead of alloc_bootmem()



Alignment of alloc_bootmem() depends on the value of
L1_CACHE_SHIFT. What we need here, however, is 64 byte alignment.  Use
alloc_bootmem_align() and explicitly specify the alignment instead.

This fixes a kernel boot crash reported by Jody when the cpu in .config
is set to MPENTIUMII but the kernel is booted on a xsave-capable CPU.

Reported-by: Jody Bruchon <jody@nctritech.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <20101116212442.059967454@sbsiddha-MOBL3.sc.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@kernel.org>

parent 53dde5f3

arch/x86/kernel/xsave.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -394,7 +394,8 @@ static void __init setup_xstate_init(void)
		* Setup init_xstate_buf to represent the init state of
		* all the features managed by the xsave
		*/
		init_xstate_buf = alloc_bootmem(xstate_size);
		init_xstate_buf = alloc_bootmem_align(xstate_size,
		__alignof__(struct xsave_struct));
		init_xstate_buf->i387.mxcsr = MXCSR_DEFAULT;

		clts();

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