- 19 May, 2015 40 commits
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Ingo Molnar authored
Ever since the kernel started defaulting to eager FPU switches on modern Intel CPUs it's not been obvious whether a given system is using the lazy or the eager FPU context switching logic. So generate a boot message about which mode the FPU code is in: x86/fpu: Using 'lazy' FPU context switches. or: x86/fpu: Using 'eager' FPU context switches. Reviewed-by:
Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
Also add a bit of documentation. Reviewed-by:
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Ingo Molnar authored
Move fpu_copy() where its only user is. Beyond readability this also speeds up compilation, as fpu-internal.h is included in over a dozen .c files. Reviewed-by:
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Ingo Molnar authored
__save_init_fpu() is just a trivial wrapper around fpu_save_init(). Remove the extra layer of obfuscation. Reviewed-by:
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Ingo Molnar authored
Instead of open-coded in_kernel_fpu access, Use kernel_fpu_disabled() in interrupted_kernel_fpu_idle(), matching the other kernel_fpu_*() methods. Also add some documentation for in_kernel_fpu. Reviewed-by:
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Ingo Molnar authored
We are not supposed to call kernel_fpu_disable() if we have not previously enabled it. Also use kernel_fpu_disable()/enable() in the __kernel_fpu_begin/end() primitives, instead of writing to in_kernel_fpu directly, so that we get the debugging checks. Reviewed-by:
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Ingo Molnar authored
This allows the compiler to inline them and to eliminate them: arch/x86/kernel/fpu/core.o: text data bss dec hex filename 6741 4 8 6753 1a61 core.o.before 6716 4 8 6728 1a48 core.o.after Reviewed-by:
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Ingo Molnar authored
It's now local to fpu/core.c, make it static. Reviewed-by:
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Ingo Molnar authored
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Ingo Molnar authored
Introduce fpu__copy() and use it in arch_dup_task_struct(), thus moving another chunk of FPU logic to fpu/core.c. Reviewed-by:
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Ingo Molnar authored
This code was historically in process.c, now we have FPU core internals in fpu/core.c instead - move it there. Reviewed-by:
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Ingo Molnar authored
It's a pointless wrapper now - use xsave_state(). Reviewed-by:
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Ingo Molnar authored
These functions (xsave_state() and xsave_state_booting()) have a 'mask' argument that is always -1. Propagate this into the functions instead and eliminate the extra argument. Does not change the generated code, because these were inlined functions. Reviewed-by:
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Ingo Molnar authored
Move the boot-time FPU bug detection code to the other FPU boot time init code in fpu/init.c. No change in code size: text data bss dec hex filename 13044568 1884440 1130496 16059504 f50c70 vmlinux.before 13044568 1884440 1130496 16059504 f50c70 vmlinux.after Reviewed-by:
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Ingo Molnar authored
Move to the new fpu__*() namespace. Reviewed-by:
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Ingo Molnar authored
It's another piece of FPU internals that is better off close to the other FPU internals. Reviewed-by:
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Ingo Molnar authored
flush_thread() open codes a lot of FPU internals - create a separate function for it in fpu/core.c. Turns out that this does not hurt performance: text data bss dec hex filename 11843039 1884440 1130496 14857975 e2b6f7 vmlinux.before 11843039 1884440 1130496 14857975 e2b6f7 vmlinux.after and since this is a slowpath clarity comes first anyway. We can reconsider inlining decisions after the FPU code has been cleaned up. Reviewed-by:
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Ingo Molnar authored
Use fpstate_free() directly to manage FPU state. Only process.c was using this method, so this is a speedup as well, as it removes the extra function call and related clobbers. Reviewed-by:
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Ingo Molnar authored
Both no_387() and fpu__detect() run at boot time, so they belong into init.c. Reviewed-by:
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Ingo Molnar authored
fpu/core.c includes a lot of files for mostly historic reasons. It only needs fpu-internal.h, which already includes all the required headers. Reviewed-by:
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Ingo Molnar authored
Move boot time FPU initialization code into init.c, to better isolate it into its own domain. Reviewed-by:
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Ingo Molnar authored
Fix a minor header file dependency bug in asm/fpu-internal.h: it relies on i387.h but does not include it. All users of fpu-internal.h included it explicitly. Also remove unnecessary includes, to reduce compilation time. This also makes it easier to use it as a standalone header file for FPU internals, such as an upcoming C module in arch/x86/kernel/fpu/. Reviewed-by:
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Ingo Molnar authored
Create a new subdirectory for the FPU support code in arch/x86/kernel/fpu/. Rename 'i387.c' to 'core.c' - as this really collects the core FPU support code, nothing i387 specific. We'll better organize this directory in later patches. Reviewed-by:
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Ingo Molnar authored
- add header guards - standardize vertical alignment - add comments about MPX No code changed. Reviewed-by:
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Ingo Molnar authored
Move the FPU details to asm/fpu_types.h, to further factor out the FPU code. ( As an added bonus, the 'struct orig_ist' definition now moves next to its other data types - the FPU definitions were slapped in the middle of them for some mysterious reason. ) No code changed. Reviewed-by:
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Ingo Molnar authored
This was pretty hard to read, improve it. Reviewed-by:
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Ingo Molnar authored
This field is kept separate from the main FPU state structure for no good reason. Reviewed-by:
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Ingo Molnar authored
So init_thread_xstate() is a misnomer in that it's not really related to a specific thread - it determines, once during initial bootup, the size of the xstate context. Also improve the comments. Reviewed-by:
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Ingo Molnar authored
fpu_init() is a bit of a misnomer in that it (falsely) creates the impression that it's related to the (old) fpu_finit() function, which initializes FPU ctx state. Rename it to fpu__cpu_init() to make its boot time initialization clear, and to move it to the fpu__*() namespace. Also fix and extend its comment block to point out that it's called not only on the boot CPU, but on secondary CPUs as well. Reviewed-by:
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Ingo Molnar authored
Make it clear that we are initializing the in-memory FPU context area, no the FPU registers. Also move it to the fpu__*() namespace. Reviewed-by:
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Ingo Molnar authored
Use the fpu__*() namespace. Reviewed-by:
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Ingo Molnar authored
Use the fpu__*() namespace for fpstate_alloc() as well. Also add a comment about FPU state alignment. Reviewed-by:
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Ingo Molnar authored
This is not a small function, and it's used in several places, one of them a popular module (KVM). Move the function out of line. This saves a bit of text, even with the symbol export overhead: text data bss dec hex filename 12566052 1619504 1089536 15275092 e91454 vmlinux.before 12566046 1619504 1089536 15275086 e9144e vmlinux.after Reviewed-by:
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Ingo Molnar authored
It's an unnecessary obfuscation of a very simple allocation pattern. Reviewed-by:
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Ingo Molnar authored
Open code the PF_USED_MATH logic, to make the logic more obvious. (We'll slowly convert the other users of *_used_math() methods as well.) Reviewed-by:
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Ingo Molnar authored
This function is only called for stopped child tasks, so the fpu__save() branch will never get called - remove it. Reviewed-by:
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Ingo Molnar authored
This function name is a misnomer now that we've split out all the other users from it. Rename it accordingly: it's used to save the FPU state of (ptrace-)stopped child tasks. Add debugging check to double check this intended usage: that this function is only called for non-current, stopped child tasks. Reviewed-by:
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Ingo Molnar authored
Now that the allocation users have been split off into a separate function, init_fpu() has become local to i387.c: make it static. Reviewed-by:
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Ingo Molnar authored
Most init_fpu() users don't want the register-saving aspect of the function, they are calling it for 'current' and when FPU registers are not allocated and initialized yet. Split out a simplified API that does just that (and add debug-checks for these conditions): fpstate_alloc_init(). Use it where appropriate. Reviewed-by:
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Ingo Molnar authored
We are going to split init_fpu() so keep only a single prototype, in i387.h. Reviewed-by:
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