x86/fpu: Improve the comment for the fpu::counter field

This was pretty hard to read, improve it.

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>

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 64d6b5d..28df855 100644 (file)
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -435,11 +435,11 @@ struct fpu {
        union thread_xstate *state;
        /*
         * This counter contains the number of consecutive context switches
-        * that the FPU is used. If this is over a threshold, the lazy fpu
-        * saving becomes unlazy to save the trap. This is an unsigned char
-        * so that after 256 times the counter wraps and the behavior turns
-        * lazy again; this to deal with bursty apps that only use FPU for
-        * a short time
+        * during which the FPU stays used. If this is over a threshold, the
+        * lazy fpu saving logic becomes unlazy, to save the trap overhead.
+        * This is an unsigned char so that after 256 iterations the counter
+        * wraps and the context switch behavior turns lazy again; this is to
+        * deal with bursty apps that only use the FPU for a short time:
         */
        unsigned char counter;
 };