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FROMLIST: [PATCH v5 04/12] arm: vdso: do calculations outside reader …
…loops (cherry picked from url https://patchwork.kernel.org/patch/10044477/) Take an effort to recode the arm64 vdso code from assembler to C previously submitted by Andrew Pinski <apinski@cavium.com>, rework it for use in both arm and arm64, overlapping any optimizations for each architecture. But instead of landing it in arm64, land the result into lib/vdso and unify both implementations to simplify future maintenance. In variable timer reading loops, pick up just the values until all are synchronized, then outside of loop pick up cntvct and perform calculations to determine final offset, shifted and multiplied output value. This replaces get_ns with get_clock_shifted_nsec as cntvct reader. Signed-off-by: Mark Salyzyn <salyzyn@android.com> Cc: James Morse <james.morse@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dmitry Safonov <dsafonov@virtuozzo.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Andy Gross <andy.gross@linaro.org> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Andrew Pinski <apinski@cavium.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Bug: 63737556 Bug: 20045882 Change-Id: I8008197f08485ef89b267128e41624ff69c33f6b Signed-off-by: khusika <khusikadhamar@gmail.com>
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