Ingo Molnar b96fecbfa8 x86/fpu: Fix boot crash in the early FPU code ... Jan Kara and Thomas Gleixner reported boot crashes in the FPU code: general protection fault: 0000 [#1] SMP RIP: 0010:[<ffffffff81048a6c>] [<ffffffff81048a6c>] mxcsr_feature_mask_init+0x1c/0x40 2b:* 0f ae 85 00 fe ff ff fxsave -0x200(%rbp) and bisected it down to the following FPU commit: 91a8c2a5b4 ("x86/fpu: Clean up and fix MXCSR handling") The reason is that the on-stack FPU registers state variable, used by the FXSAVE instruction, did not have the required minimum alignment of 16 bytes, causing the general protection fault. This is most likely a GCC bug in older GCC versions, but the offending commit also added a bogus extra 32-byte alignment (which GCC ignored too). So fix this bug by making the variable static again, but also mark it __initdata this time, because fpu__init_system_mxcsr() is now an __init function. Reported-and-bisected-by: Jan Kara <jack@suse.cz> Reported-bisected-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jan Kara <jack@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20150704075819.GA9201@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-07-04 10:05:56 +02:00
..
bugs.c	x86/fpu/init: Propagate __init annotations	2015-05-19 15:48:11 +02:00
core.c	x86/fpu: Standardize the parameter type of copy_kernel_to_fpregs()	2015-05-27 14:11:32 +02:00
init.c	x86/fpu: Fix boot crash in the early FPU code	2015-07-04 10:05:56 +02:00
Makefile	x86/fpu: Factor out the FPU regset code into fpu/regset.c	2015-05-19 15:48:09 +02:00
regset.c	x86/fpu: Rename fpu__activate_fpstate() to fpu__activate_fpstate_write()	2015-05-27 14:11:26 +02:00
signal.c	x86/fpu: Pass 'struct fpu' to fpu__restore()	2015-05-19 15:48:11 +02:00
xstate.c	x86/fpu: Fix double-increment in setup_xstate_features()	2015-06-12 10:48:12 +02:00