From: Mark Rutland <mark.rutland@arm.com>
To: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: linux-arch@vger.kernel.org, Shuah Khan <shuah@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Will Deacon <will.deacon@arm.com>,
Russell King <linux@armlinux.org.uk>,
Ralf Baechle <ralf@linux-mips.org>,
Mark Salyzyn <salyzyn@android.com>,
Paul Burton <paul.burton@mips.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Collingbourne <pcc@google.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 01/23] kernel: Standardize vdso_datapage
Date: Fri, 22 Feb 2019 12:58:13 +0000 [thread overview]
Message-ID: <20190222125812.GF42419@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <20190222122430.21180-2-vincenzo.frascino@arm.com>
Hi Vincenzo,
On Fri, Feb 22, 2019 at 12:24:08PM +0000, Vincenzo Frascino wrote:
> +#ifdef __KERNEL__
I believe that __KERNEL__ guards haven't been necessary (in non-UAPI
headers) since the UAPI split, and can be removed.
[...]
> +#include <linux/bits.h>
> +#include <linux/types.h>
> +#include <linux/time.h>
Nit: could we please keep these in alphabetical order?
> +/*
> + * There is one vdso_timestamp object in vvar for each vDSO-accelerated
> + * clock_id. For high-resolution clocks, this encodes the time
> + * corresponding to vdso_data.cycle_last. For coarse clocks this encodes
> + * the actual time.
> + *
> + * To be noticed that for highres clocks nsec is left-shifted by
> + * vdso_data.cs[x].shift.
Nit: this would read better as:
Note that for highres clocks nsec is left-shifted by
vdso_data.cs[x].shift.
[...]
> +/*
> + * vdso_data will be accessed by 32 and 64 bit code at the same time
> + * so we should be careful before modifying this structure.
> + */
Perhaps:
/*
* This structure will be accessed by native and compat vDSOs, so we
* need to ensure the layout is identical for native and compat code.
*/
... which I think is what you're trrying to say?
Thanks,
Mark.
WARNING: multiple messages have this Message-ID (diff)
From: Mark Rutland <mark.rutland@arm.com>
To: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>, Arnd Bergmann <arnd@arndb.de>,
Russell King <linux@armlinux.org.uk>,
Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Mark Salyzyn <salyzyn@android.com>,
Peter Collingbourne <pcc@google.com>,
Shuah Khan <shuah@kernel.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>
Subject: Re: [PATCH v5 01/23] kernel: Standardize vdso_datapage
Date: Fri, 22 Feb 2019 12:58:13 +0000 [thread overview]
Message-ID: <20190222125812.GF42419@lakrids.cambridge.arm.com> (raw)
Message-ID: <20190222125813.kw28OzTNswBp7Btry9FtBwLHU7oFF1EOrCE2cxJ6bNA@z> (raw)
In-Reply-To: <20190222122430.21180-2-vincenzo.frascino@arm.com>
Hi Vincenzo,
On Fri, Feb 22, 2019 at 12:24:08PM +0000, Vincenzo Frascino wrote:
> +#ifdef __KERNEL__
I believe that __KERNEL__ guards haven't been necessary (in non-UAPI
headers) since the UAPI split, and can be removed.
[...]
> +#include <linux/bits.h>
> +#include <linux/types.h>
> +#include <linux/time.h>
Nit: could we please keep these in alphabetical order?
> +/*
> + * There is one vdso_timestamp object in vvar for each vDSO-accelerated
> + * clock_id. For high-resolution clocks, this encodes the time
> + * corresponding to vdso_data.cycle_last. For coarse clocks this encodes
> + * the actual time.
> + *
> + * To be noticed that for highres clocks nsec is left-shifted by
> + * vdso_data.cs[x].shift.
Nit: this would read better as:
Note that for highres clocks nsec is left-shifted by
vdso_data.cs[x].shift.
[...]
> +/*
> + * vdso_data will be accessed by 32 and 64 bit code at the same time
> + * so we should be careful before modifying this structure.
> + */
Perhaps:
/*
* This structure will be accessed by native and compat vDSOs, so we
* need to ensure the layout is identical for native and compat code.
*/
... which I think is what you're trrying to say?
Thanks,
Mark.
WARNING: multiple messages have this Message-ID (diff)
From: Mark Rutland <mark.rutland@arm.com>
To: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: linux-arch@vger.kernel.org, Shuah Khan <shuah@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Will Deacon <will.deacon@arm.com>,
Russell King <linux@armlinux.org.uk>,
Ralf Baechle <ralf@linux-mips.org>,
Mark Salyzyn <salyzyn@android.com>,
Paul Burton <paul.burton@mips.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Collingbourne <pcc@google.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 01/23] kernel: Standardize vdso_datapage
Date: Fri, 22 Feb 2019 12:58:13 +0000 [thread overview]
Message-ID: <20190222125812.GF42419@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <20190222122430.21180-2-vincenzo.frascino@arm.com>
Hi Vincenzo,
On Fri, Feb 22, 2019 at 12:24:08PM +0000, Vincenzo Frascino wrote:
> +#ifdef __KERNEL__
I believe that __KERNEL__ guards haven't been necessary (in non-UAPI
headers) since the UAPI split, and can be removed.
[...]
> +#include <linux/bits.h>
> +#include <linux/types.h>
> +#include <linux/time.h>
Nit: could we please keep these in alphabetical order?
> +/*
> + * There is one vdso_timestamp object in vvar for each vDSO-accelerated
> + * clock_id. For high-resolution clocks, this encodes the time
> + * corresponding to vdso_data.cycle_last. For coarse clocks this encodes
> + * the actual time.
> + *
> + * To be noticed that for highres clocks nsec is left-shifted by
> + * vdso_data.cs[x].shift.
Nit: this would read better as:
Note that for highres clocks nsec is left-shifted by
vdso_data.cs[x].shift.
[...]
> +/*
> + * vdso_data will be accessed by 32 and 64 bit code at the same time
> + * so we should be careful before modifying this structure.
> + */
Perhaps:
/*
* This structure will be accessed by native and compat vDSOs, so we
* need to ensure the layout is identical for native and compat code.
*/
... which I think is what you're trrying to say?
Thanks,
Mark.
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next prev parent reply other threads:[~2019-02-22 12:58 UTC|newest]
Thread overview: 178+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 12:24 [PATCH v5 00/23] Unify vDSOs across more architectures Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 01/23] kernel: Standardize vdso_datapage Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:58 ` Mark Rutland [this message]
2019-02-22 12:58 ` Mark Rutland
2019-02-22 12:58 ` Mark Rutland
2019-02-23 16:51 ` Thomas Gleixner
2019-02-23 16:51 ` Thomas Gleixner
2019-02-23 16:51 ` Thomas Gleixner
2019-02-27 14:23 ` Vincenzo Frascino
2019-02-27 14:23 ` Vincenzo Frascino
2019-02-27 14:23 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 02/23] kernel: Define gettimeofday vdso common code Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 13:34 ` Mark Rutland
2019-02-22 13:34 ` Mark Rutland
2019-02-22 13:34 ` Mark Rutland
2019-02-22 13:49 ` Arnd Bergmann
2019-02-22 13:49 ` Arnd Bergmann
2019-02-22 13:49 ` Arnd Bergmann
2019-02-22 14:36 ` Arnd Bergmann
2019-02-22 14:36 ` Arnd Bergmann
2019-02-22 14:36 ` Arnd Bergmann
2019-02-27 14:52 ` Vincenzo Frascino
2019-02-27 14:52 ` Vincenzo Frascino
2019-02-27 14:52 ` Vincenzo Frascino
2019-02-28 9:29 ` Arnd Bergmann
2019-02-28 9:29 ` Arnd Bergmann
2019-02-28 9:29 ` Arnd Bergmann
2019-02-28 11:58 ` [PATCH 1/2] vdso: use fixed-size time types Arnd Bergmann
2019-02-28 11:58 ` Arnd Bergmann
2019-02-28 11:58 ` Arnd Bergmann
2019-02-28 11:58 ` [PATCH 2/2] vdso: add clock_gettime64 Arnd Bergmann
2019-02-28 11:58 ` Arnd Bergmann
2019-02-28 11:58 ` Arnd Bergmann
2019-02-28 13:42 ` [PATCH 1/2] vdso: use fixed-size time types Thomas Gleixner
2019-02-28 13:42 ` Thomas Gleixner
2019-02-28 13:42 ` Thomas Gleixner
2019-02-28 13:45 ` Vincenzo Frascino
2019-02-28 13:45 ` Vincenzo Frascino
2019-02-28 13:45 ` Vincenzo Frascino
2019-02-23 10:34 ` [PATCH v5 02/23] kernel: Define gettimeofday vdso common code Thomas Gleixner
2019-02-23 10:34 ` Thomas Gleixner
2019-02-23 10:34 ` Thomas Gleixner
2019-02-25 14:09 ` Vincenzo Frascino
2019-02-25 14:09 ` Vincenzo Frascino
2019-02-25 14:09 ` Vincenzo Frascino
2019-02-23 17:31 ` Thomas Gleixner
2019-02-23 17:31 ` Thomas Gleixner
2019-02-23 17:31 ` Thomas Gleixner
2019-02-27 13:47 ` Vincenzo Frascino
2019-02-27 13:47 ` Vincenzo Frascino
2019-02-27 13:47 ` Vincenzo Frascino
2019-02-27 15:49 ` Thomas Gleixner
2019-02-27 15:49 ` Thomas Gleixner
2019-02-27 15:49 ` Thomas Gleixner
2019-02-27 16:06 ` Vincenzo Frascino
2019-02-27 16:06 ` Vincenzo Frascino
2019-02-27 16:06 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 03/23] arm64: Build vDSO with -ffixed-x18 Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 04/23] arm64: Substitute gettimeofday with C implementation Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 13:42 ` Mark Rutland
2019-02-22 13:42 ` Mark Rutland
2019-02-22 13:42 ` Mark Rutland
2019-02-22 12:24 ` [PATCH v5 05/23] arm64: compat: Alloc separate pages for vectors and sigpage Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 06/23] arm64: compat: Split kuser32 Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 07/23] arm64: compat: Refactor aarch32_alloc_vdso_pages() Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 08/23] arm64: compat: Add KUSER_HELPERS config option Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 14:04 ` Mark Rutland
2019-02-22 14:04 ` Mark Rutland
2019-02-22 14:04 ` Mark Rutland
2019-02-22 14:09 ` Russell King - ARM Linux admin
2019-02-22 14:09 ` Russell King - ARM Linux admin
2019-02-22 14:09 ` Russell King - ARM Linux admin
2019-02-26 12:10 ` Vincenzo Frascino
2019-02-26 12:10 ` Vincenzo Frascino
2019-02-26 12:10 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 09/23] arm64: compat: Add missing syscall numbers Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 10/23] arm64: compat: Expose signal related structures Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 11/23] arm64: compat: Generate asm offsets for signals Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 14:22 ` Mark Rutland
2019-02-22 14:22 ` Mark Rutland
2019-02-22 14:22 ` Mark Rutland
2019-02-22 12:24 ` [PATCH v5 12/23] lib: vdso: Add compat support Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 13/23] arm64: compat: Add vDSO Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 14:32 ` Mark Rutland
2019-02-22 14:32 ` Mark Rutland
2019-02-22 14:32 ` Mark Rutland
2019-02-22 12:24 ` [PATCH v5 14/23] arm64: Refactor vDSO code Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 14:37 ` Mark Rutland
2019-02-22 14:37 ` Mark Rutland
2019-02-22 14:37 ` Mark Rutland
2019-02-22 12:24 ` [PATCH v5 15/23] arm64: compat: vDSO setup for compat layer Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 16/23] arm64: elf: vDSO code page discovery Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 17/23] arm64: compat: Get sigreturn trampolines from vDSO Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 18/23] arm64: Add vDSO compat support Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 19/23] arm64: Enable compat vDSO support Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 14:39 ` Mark Rutland
2019-02-22 14:39 ` Mark Rutland
2019-02-22 14:39 ` Mark Rutland
2019-02-22 14:41 ` Mark Rutland
2019-02-22 14:41 ` Mark Rutland
2019-02-22 14:41 ` Mark Rutland
2019-02-22 12:24 ` [PATCH v5 20/23] arm: Add support for generic vDSO Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 21/23] mips: " Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 22/23] x86: " Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-23 10:45 ` Thomas Gleixner
2019-02-23 10:45 ` Thomas Gleixner
2019-02-23 10:45 ` Thomas Gleixner
2019-02-27 16:18 ` Vincenzo Frascino
2019-02-27 16:18 ` Vincenzo Frascino
2019-02-27 16:18 ` Vincenzo Frascino
2019-02-22 12:24 ` [PATCH v5 23/23] kselftest: Extend vDSO selftest Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-22 12:24 ` Vincenzo Frascino
2019-02-23 17:39 ` [PATCH v5 00/23] Unify vDSOs across more architectures Thomas Gleixner
2019-02-23 17:39 ` Thomas Gleixner
2019-02-23 17:39 ` Thomas Gleixner
2019-02-28 11:40 ` Arnd Bergmann
2019-02-28 11:40 ` Arnd Bergmann
2019-02-28 12:09 ` Vincenzo Frascino
2019-02-28 12:09 ` Vincenzo Frascino
2019-02-28 12:38 ` Arnd Bergmann
2019-02-28 12:38 ` Arnd Bergmann
2019-02-28 12:38 ` Arnd Bergmann
2019-02-28 12:42 ` Vincenzo Frascino
2019-02-28 12:42 ` Vincenzo Frascino
2019-02-28 12:42 ` Vincenzo Frascino
2019-02-28 13:54 ` Arnd Bergmann
2019-02-28 13:54 ` Arnd Bergmann
2019-02-28 13:54 ` Arnd Bergmann
2019-02-28 15:51 ` Vincenzo Frascino
2019-02-28 15:51 ` Vincenzo Frascino
2019-02-28 15:51 ` Vincenzo Frascino
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