Commit ce578f16 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Borislav Petkov
Browse files

x86/fpu: Mark various FPU state variables __ro_after_init 



Nothing modifies these after booting.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarAndy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20210623121451.611751529@linutronix.de
parent b3607269

arch/x86/kernel/fpu/init.c

+2 −2
Original line number Diff line number Diff line
@@ -89,7 +89,7 @@ static void fpu__init_system_early_generic(struct cpuinfo_x86 *c) 
/*

 * Boot time FPU feature detection code:

 */

unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;

unsigned int mxcsr_feature_mask __ro_after_init = 0xffffffffu;

EXPORT_SYMBOL_GPL(mxcsr_feature_mask);



static void __init fpu__init_system_mxcsr(void)
@@ -135,7 +135,7 @@ static void __init fpu__init_system_generic(void) 
 * This is inherent to the XSAVE architecture which puts all state

 * components into a single, continuous memory block:

 */

unsigned int fpu_kernel_xstate_size;

unsigned int fpu_kernel_xstate_size __ro_after_init;

EXPORT_SYMBOL_GPL(fpu_kernel_xstate_size);



/* Get alignment of the TYPE. */

arch/x86/kernel/fpu/xstate.c

+9 −5
Original line number Diff line number Diff line
@@ -61,17 +61,21 @@ static short xsave_cpuid_features[] __initdata = { 
 */

u64 xfeatures_mask_all __read_mostly;



static unsigned int xstate_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_sizes[XFEATURE_MAX]   = { [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_comp_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_supervisor_only_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_offsets[XFEATURE_MAX] __ro_after_init =

	{ [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_sizes[XFEATURE_MAX] __ro_after_init =

	{ [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_comp_offsets[XFEATURE_MAX] __ro_after_init =

	{ [ 0 ... XFEATURE_MAX - 1] = -1};

static unsigned int xstate_supervisor_only_offsets[XFEATURE_MAX] __ro_after_init =

	{ [ 0 ... XFEATURE_MAX - 1] = -1};



/*

 * The XSAVE area of kernel can be in standard or compacted format;

 * it is always in standard format for user mode. This is the user

 * mode standard format size used for signal and ptrace frames.

 */

unsigned int fpu_user_xstate_size;

unsigned int fpu_user_xstate_size __ro_after_init;



/*

 * Return whether the system supports a given xfeature.