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x86/fpu: Mark various FPU state variables __ro_after_init

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Nothing modifies these after booting.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20210623121451.611751529@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-23 14:01:30 +02:00 committed by Borislav Petkov
parent b3607269ff
commit ce578f1634
2 changed files with 11 additions and 7 deletions
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4
arch/x86/kernel/fpu/init.c
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@ -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. */

14
arch/x86/kernel/fpu/xstate.c
View File

@ -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.