linux

iv/linux

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Thomas Gleixner f3e8393841 x86/vdso: Replace the clockid switch case

Now that the time getter functions use the clockid as index into the
storage array for the base time access, the switch case can be replaced.

- Check for clockid >= MAX_CLOCKS and for negative clockid (CPU/FD) first
  and call the fallback function right away.

- After establishing that clockid is < MAX_CLOCKS, convert the clockid to a
  bitmask

- Check for the supported high resolution and coarse functions by anding
  the bitmask of supported clocks and check whether a bit is set.

This completely avoids jump tables, reduces the number of conditionals and
makes the VDSO extensible for other clock ids.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Matt Rickard <matt@softrans.com.au>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: devel@linuxdriverproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Juergen Gross <jgross@suse.com>
Link: https://lkml.kernel.org/r/20180917130707.574315796@linutronix.de

2018-10-04 23:00:26 +02:00

vdso32

x86: Add build salt to the vDSO

2018-07-18 01:18:05 +09:00

.gitignore

x86/asm/entry, x86/vdso: Move the vDSO code to arch/x86/entry/vdso/

2015-06-03 18:51:37 +02:00

checkundef.sh

x86/asm/entry, x86/vdso: Move the vDSO code to arch/x86/entry/vdso/

2015-06-03 18:51:37 +02:00

Makefile

x86/vdso: Only enable vDSO retpolines when enabled and supported