From: Peter Bergner <bergner@linux.ibm.com>
To: Manjunath Matti <mmatti@linux.ibm.com>, libc-alpha@sourceware.org
Cc: fweimer@redhat.com
Subject: Re: [PATCH v2 2/2] powerpc: Add HWCAP3/HWCAP4 data to TCB for Power Architecture.
Date: Tue, 19 Mar 2024 18:50:31 -0500 [thread overview]
Message-ID: <6fa85026-e0cf-4d9b-b65e-2d24c85be366@linux.ibm.com> (raw)
In-Reply-To: <8c5c3b9d-30d5-47b6-8da2-3aca0d9a5d22@linux.ibm.com>
On 12/13/23 5:47 PM, Peter Bergner wrote:
> On 12/5/23 6:38 AM, Manjunath Matti wrote:
>> This patch adds a new feature for powerpc. In order to get faster
>> access to the HWCAP3/HWCAP4 masks, similar to HWCAP/HWCAP2 (i.e. for
>> implementing __builtin_cpu_supports() in GCC) without the overhead of
>> reading them from the auxiliary vector, we now reserve space for them
>> in the TCB.
>>
>> This is an ABI change for GLIBC 2.39.
>>
>> Suggested-by: Peter Bergner <bergner@linux.ibm.com>
>> ---
>> elf/dl-diagnostics.c | 2 +
>> elf/dl-support.c | 2 +
>> elf/elf.h | 4 ++
>> sysdeps/generic/ldsodefs.h | 2 +
>> sysdeps/powerpc/dl-procinfo.c | 6 ++-
>> sysdeps/powerpc/dl-procinfo.h | 52 +++++++++++++------
>> sysdeps/powerpc/hwcapinfo.c | 11 ++--
>> sysdeps/unix/sysv/linux/dl-parse_auxv.h | 2 +
>> sysdeps/unix/sysv/linux/dl-sysdep.c | 2 +
>> .../unix/sysv/linux/powerpc/cpu-features.c | 2 +
>> .../unix/sysv/linux/powerpc/cpu-features.h | 2 +
>> sysdeps/unix/sysv/linux/powerpc/libc-start.c | 6 +++
>> 12 files changed, 74 insertions(+), 19 deletions(-)
>
> LGTM. The only catch is that this patch is dependent on the associated
> kernel patch that adds the AT_HWCAP3 and AT_HWCAP4 getting upstream so
> glibc can rely on their values. I'm still working on upstreaming that.
The kernel patch this is dependent on has finally reached Linus's tree,
so I have pushed this patch.
Peter
next prev parent reply other threads:[~2024-03-19 23:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-05 12:38 [PATCH v2 1/2] powerpc: Add space for HWCAP3/HWCAP4 in the TCB for future Power Manjunath Matti
2023-12-05 12:38 ` [PATCH v2 2/2] powerpc: Add HWCAP3/HWCAP4 data to TCB for Power Architecture Manjunath Matti
2023-12-13 23:47 ` Peter Bergner
2024-03-19 23:50 ` Peter Bergner [this message]
2023-12-13 23:45 ` [PATCH v2 1/2] powerpc: Add space for HWCAP3/HWCAP4 in the TCB for future Power Peter Bergner
2023-12-14 23:05 ` Rajalakshmi Srinivasaraghavan
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