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Date: Mon, 9 Sep 2013 21:26:13 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: linux-m68k@...ts.linux-m68k.org Cc: Thorsten Glaser <tg@...bsd.de>, Theodore Ts'o <tytso@....edu>, linux-kernel@...r.kernel.org, Geert Uytterhoeven <geert@...ux-m68k.org> Subject: [PATCH 1/2] m68k: Add infrastructure for machine-specific get_cycles() Currently get_cycles() always returns zero. As get_cycles() is called to add entropy to the random number generator pool, security can be increased by adding a hook where platforms can provide their own implementation. Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org> --- arch/m68k/include/asm/machdep.h | 1 + arch/m68k/include/asm/timex.h | 5 +---- arch/m68k/kernel/time.c | 13 +++++++++++++ 3 files changed, 15 insertions(+), 4 deletions(-) diff --git a/arch/m68k/include/asm/machdep.h b/arch/m68k/include/asm/machdep.h index 953ca21..334f751 100644 --- a/arch/m68k/include/asm/machdep.h +++ b/arch/m68k/include/asm/machdep.h @@ -22,6 +22,7 @@ extern unsigned int (*mach_get_ss)(void); extern int (*mach_get_rtc_pll)(struct rtc_pll_info *); extern int (*mach_set_rtc_pll)(struct rtc_pll_info *); extern int (*mach_set_clock_mmss)(unsigned long); +extern cycles_t (*mach_get_cycles)(void); extern void (*mach_reset)( void ); extern void (*mach_halt)( void ); extern void (*mach_power_off)( void ); diff --git a/arch/m68k/include/asm/timex.h b/arch/m68k/include/asm/timex.h index 6759dad..0fdc5d2 100644 --- a/arch/m68k/include/asm/timex.h +++ b/arch/m68k/include/asm/timex.h @@ -23,9 +23,6 @@ typedef unsigned long cycles_t; -static inline cycles_t get_cycles(void) -{ - return 0; -} +extern cycles_t get_cycles(void); #endif diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c index 7eb9792..65b1663 100644 --- a/arch/m68k/kernel/time.c +++ b/arch/m68k/kernel/time.c @@ -28,6 +28,19 @@ #include <linux/timex.h> #include <linux/profile.h> + +cycles_t (*mach_get_cycles)(void); + +cycles_t get_cycles(void) +{ + if (mach_get_cycles) + return mach_get_cycles(); + + return 0; +} +EXPORT_SYMBOL(get_cycles); + + /* * timer_interrupt() needs to keep up the real-time clock, * as well as call the "xtime_update()" routine every clocktick -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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